piping Layoutes Ppg 0201

ENGINEERING STANDARDS

PIPING, DESIGN AND LAYOUT ES-PPG-0201

The information contained in this document is confidential and proprietary to NOVA Chemicals and may not be disclosed in whole or in part to any other individual or organization without the prior written consent of NOVA Chemicals. Use of this information for any purpose other than that authorized by NOVA Chemicals is strictly prohibited. Rev. No.: First Issue Date:

28.07.1999

Rev. Date:

10 26.06.2013

Leadership Approval: Dave Richmond Director, Central Engineering Technical Approval:

Gary Laevens

Joep Beurskens

Nick Mastrobuono

Mechanical Engineer (ME)

Mechanical Engineer (MW)

Mechanical Engineer (ME)

Standard Number: Standard Name:

Rev No.

Rev to Section No.

01

5.15.1; 5.15.2; 5.15.3, 10.7

02

05

5.2.2; 5.11.7; Appendix B 5.14.1; 7.2.4; 11.1.6, 11.2.8 7.1; 7.3; 9.2.10; 12; 15.2 5.13.2

06

Dwg 8117

07

Dwgs

08

1.1.2 1.2.2 2.2 2.3 4.1.3 5.1.1 5.3.1 5.9.3 to 5.9.6

03

04

5.13 5.14 5.14.1 5.15.1 5.15.4 5.17.1 5.18 6.2.10 6.75, 6.76 7.2.11 9 9.1.2 10.9

ENGINEERING STANDARDS REVISION REGISTER ES-PPG-0201 Piping, Design and Layout Authored / Reviewed By

Approved By

Description

Date

Add drain pipe design guide for corr osion prevention improvement; add nitrogen line connection design guide for back-flow and cross contamination prevention ‘Clamp‘Clamp-on’ type on’ type chain-wheel shall not be used. Appendix “B” update

19.Nov.02

Chester Kos

E. Wong

15.Jul.04

Blaine Weller

E. Wong

- New guideline for use of Flangeless valve. - Reinforce pump positive shut-off provision. - Add statements to warn U/G piping use.

30.Apr.05

Blaine Weller

E. Wong

Add new sections 9.2.10, 12 and 15.2 o n Manual Gas shutoff valve, Non-metallic piping; Strainer selection and drawings Add new clause to alert the use of Ball check valves Changed 8117 to 8117A and added new drawing 8117B Remove 8092, add 8093

20.Oct.06

Adrian Pawson

E. Wong

31.Mar.07

Gary Laevens

E. Wong

Renamed EG-PPG-0201 to ES-PPG-0201 Updated to reflect change to a specification. General update Reference to EG-PPG-0101 deleted. General updates to reference NOVA Stds. Added NFPA and NSF industry standards. Deleted Specific reference to EG-ENV-0101, ES-PPG1001, EG-PRO-0101 and ES-PRO-0102 removed NPS 2 is minimum size permitted in racks General update to clarify expectations surrounding valves and specialty valves General rewording Renamed from Flangeless to Wafer Type Valves Reworded to not permit non-lugged versus not recommended General update Update to clarify expectation around use of table General update Updated to reflect new gusseting requirements. General update Word ‘STATIC’ included ‘STATIC’ included in title New: All potable water water distribution system to comply with NSF61

22.May.07

E. Wong

16.Nov.07

G. Laevens

18.Apr.11

G. Laevens N. Mastrobuono

N. Mastrobuono J. Beurskens


Rev No.

Rev to Section No.

01

5.15.1; 5.15.2; 5.15.3, 10.7

02

05

5.2.2; 5.11.7; Appendix B 5.14.1; 7.2.4; 11.1.6, 11.2.8 7.1; 7.3; 9.2.10; 12; 15.2 5.13.2

06

Dwg 8117

07

Dwgs

08

1.1.2 1.2.2 2.2 2.3 4.1.3 5.1.1 5.3.1 5.9.3 to 5.9.6

03

04

5.13 5.14 5.14.1 5.15.1 5.15.4 5.17.1 5.18 6.2.10 6.75, 6.76 7.2.11 9 9.1.2 10.9

ENGINEERING STANDARDS REVISION REGISTER ES-PPG-0201 Piping, Design and Layout Authored / Reviewed By

Approved By

Description

Date

Add drain pipe design guide for corr osion prevention improvement; add nitrogen line connection design guide for back-flow and cross contamination prevention ‘Clamp‘Clamp-on’ type on’ type chain-wheel shall not be used. Appendix “B” update

19.Nov.02

Chester Kos

E. Wong

15.Jul.04

Blaine Weller

E. Wong

- New guideline for use of Flangeless valve. - Reinforce pump positive shut-off provision. - Add statements to warn U/G piping use.

30.Apr.05

Blaine Weller

E. Wong

Add new sections 9.2.10, 12 and 15.2 o n Manual Gas shutoff valve, Non-metallic piping; Strainer selection and drawings Add new clause to alert the use of Ball check valves Changed 8117 to 8117A and added new drawing 8117B Remove 8092, add 8093

20.Oct.06

Adrian Pawson

E. Wong

31.Mar.07

Gary Laevens

E. Wong

Renamed EG-PPG-0201 to ES-PPG-0201 Updated to reflect change to a specification. General update Reference to EG-PPG-0101 deleted. General updates to reference NOVA Stds. Added NFPA and NSF industry standards. Deleted Specific reference to EG-ENV-0101, ES-PPG1001, EG-PRO-0101 and ES-PRO-0102 removed NPS 2 is minimum size permitted in racks General update to clarify expectations surrounding valves and specialty valves General rewording Renamed from Flangeless to Wafer Type Valves Reworded to not permit non-lugged versus not recommended General update Update to clarify expectation around use of table General update Updated to reflect new gusseting requirements. General update Word ‘STATIC’ included ‘STATIC’ included in title New: All potable water water distribution system to comply with NSF61

22.May.07

E. Wong

16.Nov.07

G. Laevens

18.Apr.11

G. Laevens N. Mastrobuono

N. Mastrobuono J. Beurskens


Rev No. 09

Rev to Section No. 2.3 5.5.3 to 5.5.7 5.6.1 5.9.8

5.13.1 to 5.13.3 6.2.8, 7.1.1,

ENGINEERING STANDARDS REVISION REGISTER ES-PPG-0201 Piping, Design and Layout

Description Added ASME B16.48 (Line Blanks). Updated CGA to reflect CSA Modified to reflect using ASME B16.48 dimensions on blanks and spacer for piping classes having less than ⅛” (3 ⅛” (3 mm) corrosion allowance Removed reference to ES-PPG-1505

Date

Authored / Reviewed By

Approved By

23.May.12

G. Laevens

J. Beurskens

26.Jun.13

M. Nobert

G. Laevens

Added wording to clarify that if valves are to be supplied with bypass lines that this is clearly specified when ordering the valves. Clarified instructions Removed reference to MAC standards

7.2.1 8.0

Added NOTE above General section

8.1.1

Removed reference to IAC Standard

8.2 to 8.3

All direction removed and reference to EGPRO-0104 through EG-PRO-0109 added

9.2.1

Corrected CAN to CSA

9.2.8

Modified wording to reflect requirements for documentation of flexible connections Corrected error in CSA code being referenced and modified wording Updated wording to reflect that connection methods used on temporary installations involving hydrocarbon or hazardous services that do not comply with those in the line class require and approved deviation Updated wording to reflect that wood only to be used as temporary support if process temperatures permit Added ‘Swage Nipple Selection’ Added ‘Instructions for use of NO VA Corporate Piping Specifications in Existing NOVA Facilities’. This was previously found in ESESPPG-1502

9.2.10 16.1.1

16.1.2

17 18

10

2.2.17

Added reference to ASME B16.48.

5.5

Change Request C13-04-PPG-503; Revised requirements for blanks and spacers.

J. Beurskens

NOVA Chemicals

Initial Issue Date:


Piping, Design and Layout

28.07.1999

Eng. Std. #:

ES-PPG-0201

Page No.:

4 of 43

Rev. No.:

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Rev. Date:

26.06.2013

TABLE OF CONTENTS Page No. 1.

GENERAL .................................................................................................................................. 7 1.1 Scope .............................................................................................................................. 7 1.2 Units of Measurement Measurement ..................................................................................................... 7 1.3 Definition of Terms .......................................................................................................... 7

2.

STANDARDS, CODES AND REGULATIONS REGULATIONS ........................................................................... 7 2.1 General ........................................................................................................................... 7 2.2 NOVA Engineering Engineering Standards Standards ......................................................................................... 7 2.3 Industry Standards and Codes ........................................................................................ 8

3.

GOVERNANCE GOVERNANCE OF DOCUMENTS ............................................................................................ 9 3.1 General ........................................................................................................................... 9

4.

QUALITY ASSURANCE (QA) (Q A) AND QUALITY CONTROL (QC) ................................................ 9 4.1 General ........................................................................................................................... 9

5.

GENERAL PIPING DETAILS ................................................................................................... 10 5.1 General Arrangement / Piping Plans ............................................................................. 10 5.2 Clearances Clearances .................................................................................................................... 11 5.3 Line Details ................................................................................................................... 11 5.4 Fitting Details ................................................................................................................ 1 11 1 5.5 Blinds \ Blanks............................................................................................................... 12 5.6 Connections Connections .................................................................................................................. 12 5.7 Maintenance Maintenance Facilities ................................................................................................... 13 5.8 Miscellaneous Miscellaneous Fittings ................................................................................................... 13 5.9 Valves ........................................................................................................................... 13 5.10 Valve Locations and Arrangements Arrangements ............................................................................... 14 5.11 Valve Chain Wheels and Extensions ............................................................................. 15 15 5.12 Open End Details (Valves) ............................................................................................ 16 5.13 Check Valves ................................................................................................................ 16 5.14 Wafer Type Valves ........................................................................................................ 17 5.15 Vents and Drains........................................................................................................... 17 5.16 Bypasses Bypasses ...................................................................................................................... 18 5.17 Instrument Instrument Connections Connections ................................................................................................ 18 5.18 Gusseting ...................................................................................................................... 18 5.19 Pressure Testing ........................................................................................................... 19 19

6.

PIPE SUPPORTS SUPPORTS ..................................................................................................................... 20 6.1 Thermal Movement Movement ....................................................................................................... 20 6.2 Supports........................................................................................................................ 20 6.3 Hangers ........................................................................................................................ 21 6.4 Pipe Spacing ................................................................................................................. 21 6.5 Guides........................................................................................................................... 21 6.6 Shoes ............................................................................................................................ 22

NOVA Chemicals

Initial Issue Date: 28.07.1999 6.7



Eng. Std. #:

ES-PPG-0201

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5 of 43

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Rev. Date:

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Anchors......................................................................................................................... 22

7.

PUMPS AND COMPRESSOR PIPING..................................................................................... 22 7.1 Pump Suction Piping ..................................................................................................... 22 7.2 Pump Piping Arrangements........................................................................................... 22 7.3 Compressor Piping Arrangement .................................................................................. 23

8.

PRESSURE RELIEF PIPING AND DEPRESSURING SYSTEMS ............................................ 24 8.1 General ......................................................................................................................... 24 8.2 Over Pressure Protection Requirements ....................................................................... 24

9.

LAYOUT OF PIPING AROUND STATIC EQUIPMENT ............................................................ 25 9.1 General ......................................................................................................................... 25 9.2 Heater Piping ................................................................................................................ 25 9.3 Vessel Piping ................................................................................................................ 26 9.4 Exchanger Piping .......................................................................................................... 26 9.5 Storage Tank Piping...................................................................................................... 27

10.

UTILITY PIPING ....................................................................................................................... 27 10.1 General ......................................................................................................................... 27 10.2 Steam Piping................................................................................................................. 27 10.3 Condensate Piping ........................................................................................................ 28 10.4 Steam Trapping and Tracing ......................................................................................... 28 10.5 Process Cooling Water Piping ....................................................................................... 29 10.6 Utility Stations ............................................................................................................... 29 10.7 Permanent Nitrogen Connections to Process Vessels and Lines .................................. 29 10.8 Safety Shower and Eye Wash Fountains ...................................................................... 30 10.9 Potable Water ............................................................................................................... 30

11.

UNDERGROUND PIPING ........................................................................................................ 30 11.1 General ......................................................................................................................... 30 11.2 Sewers and Drainage Piping ......................................................................................... 30 11.3 Fire Protection System .................................................................................................. 31

12.

NON-METALLIC PIPING ......................................................................................................... 31 12.1 General ......................................................................................................................... 31 12.2 Limitations ..................................................................................................................... 31

13.

WINTERIZATION ..................................................................................................................... 32 13.1 General ......................................................................................................................... 32 13.2 Condensate Piping ........................................................................................................ 32 13.3 Steam Piping................................................................................................................. 32 13.4 Water ............................................................................................................................ 33 13.5 Process Piping Above Grade ........................................................................................ 33

14.

INSULATION ............................................................................................................................ 33

NOVA Chemicals

Initial Issue Date: 28.07.1999



Eng. Std. #:

ES-PPG-0201

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6 of 43

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Rev. Date:

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15.

SAMPLING...............................................................................................................................33 15.1 General Piping Design Requirements ........................................................................... 33

16.

TEMPORARY PIPING.............................................................................................................. 34 16.1 General Requirements .................................................................................................. 34 16.2 Strainer Selection.......................................................................................................... 34

17.

SWAGE NIPPLE SELECTION ................................................................................................. 36

18.

INSTRUCTIONS FOR USE OF NOVA CORPORATE PIPING CLASSES IN EXISTING NOVA FACILITIES .............................................................................................................................. 36 18.1 General ......................................................................................................................... 36 18.2 New Piping Installations ................................................................................................ 37 18.3 New Piping Installations Connecting to Existing Piping ................................................. 37 18.4 Replacement in Kind ..................................................................................................... 38 18.5 Examples of Using New Piping Classes ........................................................................ 38

19.

APPENDIX A – DEFINITION OF TERMS................................................................................. 41 19.1 Definitions of Standard Engineering Terms ................................................................... 41 19.2 Definitions of Engineering Discipline Terms .................................................................. 42

20.

APPENDIX B – LINKS TO STANDARD NOVA DETAIL DRAWINGS WEBPAGES................ 42

21.

APPENDIX C – LINKS TO NOVA ENGINEERING STANDARD DRAWINGS ......................... 43

NOVA Chemicals

Initial Issue Date:



28.07.1999

Eng. Std. #:

ES-PPG-0201

Page No.:

7 of 43

Rev. No.:

10

Rev. Date:

26.06.2013

1.

GENERAL

1.1

Scope

1.1.1

This Engineering Standard defines the specific requirements for the design and layout of all above and below ground process and utility piping for NOVA Chemicals Corporation (hereinafter referred to as 'NOVA').

1.1.2

This specification was developed for specific use by NOVA engineering, maintenance, project personnel and consulting engineers acting on behalf of NOVA.

1.1.3

No variation shall be made from this Standard without prior completion and approval of a NOVA Engineering Standards Variance Form (No. SPF-012).

1.2

Units of Measurement

1.2.1

All units of measurement are expressed in English Units (U.S. Conventional System of Measurement) followed by the International System of Metric Units (SI) in parentheses.

1.3

Definition of Terms

1.3.1

The definitions of standard engineering and discipline terms used throughout this Standard are listed in Appendix ‘A’.

2.

STANDARDS, CODES AND REGULATIONS

2.1

General NOVA representatives and its suppliers are responsible for identifying, issuing and using copies of the applicable editions / addenda of NOVA Standards, and Industry Standards and Codes, cited in Sections 2.2 and 2.3 below.

2.2

NOVA Engineering Standards 1. EG-CIV-0112

Underground Sewers and Drains Guideline

2. EG-EXG-0101

Shell and Tube Heat Exchangers, Design Guideline

3. ES-IAC-1701

Analytical Instruments Sampling and Analysis, General Requirements

4. EG-INS-0101

Thermal Insulation, Administrative Selection Guideline

5. EG-MAC-0701

Guideline for Lubrication, Shaft-Sealing, Control-Oil, Instrumentation, Electrical and Piping Systems for Rotating Equipment Trains and Package Units

6. ES-PCL-0301

Protective Coatings for Underground Piping

7. EG-PPG-0105

Piping, Guideline for Linelist

8. ES-PPG-0207

Piping, Piping Flexibility

NOVA Chemicals

Initial Issue Date:



28.07.1999

2.3

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9. EG-PPG-0601

Piping, Steam Tracing Systems Design Guideline

10. ES-PPG-1201

Piping, Pressure Testing for Piping and Equipment

11. ES-PPG-1506

Piping, Instrument Gauge Valve Connections

12. ES-PPG-1507

Piping, Vents and Drains

13. ES-PPG-1601

Piping, Pipe Support Design

14. ES-PPG-1602

Piping, Allowable Pipe Span Between Supports

15. ES-PPG-1603

Piping, Pipe Supports Installation

16. ES-PPG-1604

Piping, Pipe Supports Numbering System

17. ES-PPG-8102

ASME B16.48 Based Blanks and Spacers, Types, Dimensions & General Notes

18. EG-PRO-0104

Pressure Safety Devices Design Guideline – General

19. EG-PRO-0105

Pressure Safety Devices Design Guideline – Overpressure Causes and Assumptions

20. EG-PRO-0106

Pressure Safety Devices Design Guideline – Calculation of Required Relief Capacity

21. EG-PRO-0107

Pressure Safety Devices Design Guideline – Selection of Relief Device

22. EG-PRO-0108

Pressure Safety Devices Design Guideline – Sizing of Relief Device

23. EG-PRO-0109

Pressure Safety Devices Design Guideline – Installation

24. ES-TNK-0101

Tankage, API 650 – General

25. EG-VLV-0101

Valves Selection / Design Guideline

26. ES-VLV-0102

Valves, General Requirements

27. NOVA LPS Standards

NOVA Loss Prevention Engineering Standards (LPS)

Industry Standards and Codes 1. API RP 520

Sizing, Selection and Installation of Pressure-Relieving Devices (Part I – Sizing and Selection, and Part II – Installation)

2. API RP 521

Guide for Pressure Relieving and Depressurizing Systems

3. ASME B16.25

Buttwelding Ends

4. ASME B16.48

Line Blanks

5. ASME B31.3

Process Piping

6. ASME B31.1

Power Piping

7. ASME Code

Power Boiler Code, Section 1

NOVA Chemicals

Initial Issue Date:



28.07.1999

Eng. Std. #:

ES-PPG-0201

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8. ASTM D1248 to F714

Various Specifications

9. CSA / CGA-B149.1

Natural Gas Installation Code

10. CSA / CGA-B149.3

Code for the Field Approval of Fuel-Related Components on Appliances and Equipment

11. CSA / CGA-3.16M88

Lever Operated Non-Lubricated Gas Shut-Off Valves

12. NFPA 15

Water Spray Fixed Systems for Fire Protection

13. NFPA 24

Standard for the Installation of Private Fire Service Mains and Their Appurtenances

14. NSF61

National Sanitary Foundation (NSF) - Drinking Water System Components - Health Effects

3.

GOVERNANCE OF DOCUMENTS

3.1

General Where variances occur between the documents explaining the work, the following order of precedence will govern as they apply:

3.1.1

Purchasing Document

3.1.2

The Scope of Work

3.1.3

Drawings / Specifications / Standards In the case of variances or inconsistencies between the drawings, specifications or standards the supplier(s) shall consult with the NOVA representative for a decision before proceeding with the work.

4.

QUALITY ASSURANCE (QA) AND QUALITY CONTROL (QC)

4.1

General

4.1.1

It is the responsibility of the Piping Design Department to perform a conformance check to the P&IDs. It is also the responsibility of the Piping Design Department to perform a physical check of all piping for interference with steelwork, equipment and cable trays, etc. and to ensure that the piping will correctly connect with the equipment and meets the criteria laid down in the stress analysis.

4.1.2

The Piping Design Department must also take into account the design requirements for piping connections as specified in other NOVA Engineering Standards for pressure vessels, rotating equipment, etc. These requirements are detailed in the NOVA Engineering Standards listed in Section 2.2 of this document.

NOVA Chemicals

Initial Issue Date:



28.07.1999

Eng. Std. #:

ES-PPG-0201

Page No.:

10 of 43

Rev. No.:

10

Rev. Date:

26.06.2013

5.

GENERAL PIPING DETAILS

5.1

General Arrangement / Piping Plans

5.1.1

The Piping Engineers and Designers are to utilize project design basis information, P&IDs and Linelists prior to proceeding with the design of any piping systems.

5.1.2

All piping systems shall be routed using the shortest possible runs and using the minimum number of fittings.

5.1.3

Preferably, all piping shall be above ground. However, large diameter pipe in non-flammable services such as cooling water supply and return lines may be buried.

5.1.4

Piping shall be supported as follows: a) All insulated and heat traced lines shall be supported on metal shoes. Lines with 3 inch (75 millimeters) thick insulation or less shall have the Bottom of Pipe (BOP) set at 4 inches (100 millimeters) above the Top of Steel (TOS). Lines with insulation greater than 3 inches (75 millimeters) shall have their BOP set at 6 inches (150 millimeters) above TOS. Where insulation thickness exceeds 5 inches (125 millimeters), special shoes must be designed. b) Un-insulated lines with a design temperature below 250°F (121°C) shall rest directly on the supporting steelwork. c) Un-insulated lines with a design temperature of 150°F (65.6°C) and above that rest on concrete members shall be supported on metal shoes. d) All lines in cryogenic services shall be installed at an elevation necessary to accommodate the required insulation thickness.

5.1.5

Automated, modulating and relief valves shall be located in piping systems to be accessible from platforms or grade and grouped together at main operating platform or levels.

5.1.6

Piping entering or leaving a process unit area shall have an isolation valve and a spectacle blind located at the unit’s battery limit.

5.1.7

Dead legs or pockets shall be avoided wherever possible; however, if a dead leg or pocket occurs, provide a drain.

5.1.8

Directional changes in pipe racks and piping layouts shall normally include an elevation change, by a minimum of one 90° (degree) elbow rolled at 45° (degree), plus a 45° (degree) elbow. Route the piping in north / south direction at consistent elevations different from east / west consistent elevations. Difference in elevation between north / south and east / west racks shall preferably be set by the elevation change required by two long radius 90° (degree) elbows on the largest size line on the rack. For very large lines, it may be practical to use same elevation direction changes.

NOVA Chemicals

Initial Issue Date:



28.07.1999

Eng. Std. #:

ES-PPG-0201

Page No.:

11 of 43

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Rev. Date:

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5.2

Clearances

5.2.1

The minimal overhead clearance to the underside of any obstructions, i.e.: flanges, insulation or structural support or steel over roadways, platforms, etc. shall be as follows: a) Normal overhead, inside battery limits

10 feet, 0 inches (3.0 meters)

b) Above platform and walkways


c) Inside buildings or within common equipment groups


d) Plant road, outside battery limits


e) At grade (sleepers)

1 foot, 0 inches (0.3 meters)

f)

Plant road, trucking area, inside battery limits


g) Clearance around railroads and public roadways


5.2.2

To permit ready access for the maintenance and inspection of a line, a minimum side clearance of 1 inch (25 millimeters) shall be provided between parallel lines outside of insulation or between flanges and pipe insulation. Refer to NOVA ‘Pipe Spacing’ Engineering Drawings – Standard Details Numbers ES-PPG-8130 through to ES-PPG-8135. Thermal movements shall be taken into consideration in determining side clearances.

5.3

Line Details

5.3.1

The minimum line size for process or utility piping installed on pipe racks shall be NPS 2. Underground piping shall be NPS 4 minimum.

5.3.2

Pipe sizes of NPS 1¼, NPS 2½ and NPS 5 are not to be used.

5.3.3

Where a branch is connected to a header of a higher material specification or rating, the header specification shall prevail up to and including the first shutoff valve in the line of the branch.

5.3.4

Where practical, provide a flanged connection between steel and alloy piping to avoid dissimilar welds.

5.4

Fitting Details

5.4.1

Provide a break flange in piping that must be removed frequently for maintenance or inspection.

5.4.2

The use of unions is to be kept to a minimum.

5.4.3

Flanges are to be kept to a minimum in piping system, particularly in high pressure steam service, heat transfer oil, hydrogen, oxygen and overhead pipe racks.

5.4.4

Reducing bushings shall not be used. Where pipe size reduction is required, a swage nipple or butt weld reducer shall be used.

NOVA Chemicals

Initial Issue Date:



28.07.1999

Eng. Std. #:

ES-PPG-0201

Page No.:

12 of 43

Rev. No.:

10

Rev. Date:

26.06.2013

5.4.5

Connections to equipment, in-line instruments or valves fabricated from cast iron material shall be made with flat-faced flanges.

5.4.6

Long radius elbows are to be used for all butt weld piping systems, unless otherwise specified.

5.5

Blinds \ Blanks

5.5.1

Use weld caps to close headers or dead ends of above ground lines. In steam headers and where cleanout branches are required, the lines should be terminated using a blind flange and provide a drain valve.

5.5.2

Ladders and platforms shall be provided for access to line blinds.

5.5.3

With the exception of the handle, spacer and blank dimensions shall be in accordance with ASME B16.48 for all piping classes having ≤ ⅛ inch, (3 millimeters) corrosion allowance.

5.5.4

Handles identifying paddle spacers and paddle blanks shall be manufactured in accordance with NOVA Engineering Standard Detail ES-PPG-8102 ASME B16.48 Based Blanks & Spacers, Types, Dimensions & General Notes.

5.5.5

Permanent handling equipment shall be provided for all figure-8 blanks, paddle spacers and paddle blanks weighing more than 123.5 pounds (56 kilograms) unless mobile lifting equipment can be used.

5.5.6

Piping at vessel nozzles shall be arranged so that blanks or spacers can be readily installed or valves and/or pipe spools removed for maintenance blinding.

5.5.7

Figure-8 (spectacle) blinds shall be used in lieu of a spacer and blank set when the weight of the figure-8 assembly is less than 123.5 pounds (56 kilograms). The use of figure-8 blanks that meet this criteria would be preferred in locations where there is limited equipment access. In locations where figure-8 blanks are used, there must be enough space to rotate the figure-8 blank about one bolt hole. Locations where the paddle blank weighs more than 81.5 pounds (37 kilograms) should preferably be installed between flanges in the vertical plane.

5.5.8

Locations where the above limitations on blank and spacer weight will be exceeded must be reviewed and approved by NOVA Engineering, Operations and Maintenance groups in the affected facility.

5.6

Connections

5.6.1

Branch connections are governed by the branch table specified in the applicable piping class.

5.6.2

Branch connections to headers in utility gases, air, condensate and steam shall be made into the top of the header.

5.6.3

Branch connections to headers for liquids other than condensate shall be made into the bottom of the header.

NOVA Chemicals

Initial Issue Date:



28.07.1999

Eng. Std. #:

ES-PPG-0201

Page No.:

13 of 43

Rev. No.:

10

Rev. Date:

26.06.2013

5.6.4

Threaded connections into welded piping systems are only acceptable for instrument tubing and shall be located downstream of the last block valve from the header.

5.7

Maintenance Facilities

5.7.1

Where equipment must be removed for maintenance, piping around such equipment shall be self-supporting so that a minimum of temporary pipe supports is required for equipment maintenance.

5.8

Miscellaneous Fittings

5.8.1

Miscellaneous piping fittings, i.e.: traps, strainers, meters and filters, etc., that are not covered by ASME codes, shall have their design registered with the governing authority. See also NOVA Engineering Guideline EG-PPG-0601 Piping, Steam Tracing Systems Design Guideline.

5.9

Valves

5.9.1

The type of valves to be used in any piping system shall be governed by the type indicated on the P&ID. Double block and bleed installation shall be provided in locations as shown on the P&ID.

5.9.2

Valves shall be specified in accordance with the following NOVA Engineering Guidelines and Standards:  

EG-VLV-0101 Valves, Selection / Design Guideline ES-VLV-0102 Valves, General Requirements

5.9.3

Unless considered a specialty valve, only valves specified within the applicable NOVA piping line classes are to be selected.

5.9.4

Valves are to be designed, fabricated and tested in accordance with the NOVA valve datasheets and the standards referenced therein. Any deviations from the NOVA valve datasheets require NOVA engineering approval.

5.9.5

Unless an equipment tag number is assigned, any valve used that does not have an existing corporate valve number will be considered a specialty item. A specialty number is to be assigned and specialty valve datasheet to be created.

5.9.6

Valves are be supplied by NOVA approved manufacturers. See approved manufacturers list located on the corporate website. Individual projects may elect to generate a project specific approved valve manufacturers list that must be approved by NOVA Engineering.

5.9.7

Globe valves in sizes NPS 6 or larger shall only be used when specified by NOVA.


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When a pressure balancing bypass is required as shown on P&ID's, the bypass sizes shall be as follows: Valve Diameter (NPS) 4

Class 150

Class 300

Class 600

Class 900 and above

-

-

-

NPS ¾

6

-

-

NPS ¾

NPS ¾

8

-

-

NPS ¾

NPS ¾

10

-

NPS 1

NPS 1

NPS 1

12

NPS 1

NPS 1

NPS 1

NPS 1

14 to 20

NPS 1½

NPS 1½

NPS 1½

NPS 1½

24

NPS 2

NPS 2

NPS 2

-

Note: Engineering must ensure that the need for a bypass line, the size and the specific valve(s) to be used on this bypass line is clearly identified on either the purchase order or valve datasheet. Purchase order must specify whether a single or double isolation valve is required on the bypass line. See NOVA Engineering Standard ES-VLV-0102 Valves, General Requirements. 5.9.9

Gear operators shall be specified for gate valves when required by NOVA Engineering Standard ES-VLV-0102 Valves, General Requirements and the table below. Gear operators for other types of valves shall be as specified by the valve manufacturer.

150

Valve Nominal Size (NPS) ≥ 12

300

≥ 12

600

≥ 10

900

≥ 10

1500

≥ 8

2500

≥ 6

ASME Class

5.10

Valve Locations and Arrangements

5.10.1 Other than at battery limits, locating valves in pipe racks is to be kept to a minimum. 5.10.2 Valves shall preferably be installed with their stems in the vertical plane with hand wheels and operators on top. Isolation valves on flare headers and relief valve isolation valves should be installed with their stems in the horizontal position. 5.10.3 Block valves on branch connections running on to a pipe rack shall be located as close to the header as possible.

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5.10.4 Block valves on branch lines off headers shall be arranged for self-draining on both sides or provided with drain points. 5.10.5 All valves that are normally operated as part of the unit operation shall be accessible and operable either from grade or a platform reached by a ladder or stairway. This also applies to all motor operated valves. 5.10.6 Orientation of operators and hand wheels shall be such that they do not obstruct access along the platforms or walkways. 5.10.7 Infrequently operated block valves, such as valves located in pipe racks, should be accessible from portable ladders at no more than 20 feet (6 meters) above grade. 5.11

Valve Chain Wheels and Extensions

5.11.1 Chain operators (chain wheels or chain levers on quarter-turn valves) and extension stems are to be kept to a minimum. They shall be avoided for valves NPS 1½ and smaller and valves with non-rising stems. 5.11.2 All valves that are subject to frequent or emergency operation and are located 7 feet (2.1 meters) or more above grade or platform level shall be provided with chain operators or extension stems. However, the emphasis shall always be on locating the valves in an accessible position with the provision of chain wheel operators being a last resort option. 5.11.3 When chain operators cannot be avoided, they must be specified in accordance with this standard, including all safety devices. All valves with chain operators shall be indicated on the P&IDs. Chain operators shall be indicated on the isometric drawing with a complete, detailed bill of material for all components of the chain operator and safety devices. 5.11.4 Chain wheels on valves NPS 6 and larger shall be provided with impact devices when chain length is 6 feet (1.8 meters) or greater. 5.11.5 Valves equipped with chain operators shall have their stems arranged so that the chains do not fall on the equipment. Chains shall terminate 4 feet (1.2 meters) above grade or platform. Hooks shall be provided to hold chains clear of operating areas. 5.11.6 Chain operators must be installed as per manufacturer’s recommendations. Modification of the chain operator / valve hand wheel clamping device is not permitted. Before operating the valve for the first time it shall be inspected and tested to ensure proper installation and operation. 5.11.7 All chain wheels shall be of the direct mount style, where the Original Equipment Manufacturer (OEM) valve hand wheel is removed and the adapter plate is machined to the identical hole design (i.e.: replaces the OEM hand wheel exactly). Clamp-on type chain wheels are not acceptable.


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5.11.8 The adapter plate mounting hole shall be round with a keyway for attachment to the valve sleeve yoke or tapered square hole for mounting on the end of the valve stem. 5.11.9 After installation of the chain wheel operator, the OEM hand wheel retaining nut shall be locked in place by drilling and tapping the nut and installing a set screw to prevent loosening. (See NOVA Engineering Drawing ES-PPG-8148). 5.11.10 A safety cable shall be installed on all chain operated valves, on both existing and new installations. The safety cable shall secure the chain wheel operator (or lever operator, in the case of quarter turn valves) such that the chain operator is secured against falling in the event that it comes loose. The safety cable shall not interfere with the operation of the valve. On chain wheel operated valves, one (1) end of the cable shall be looped around the valve yoke and the other end around the centre leg of the chain guide. (See NOVA Engineering Drawing ES-PPG8149). Note that some OEM manufacturers stock safety cables for their operators. On chain lever operated valves, one (1) end of the chain shall be looped around the valve body and the other end through a hole in the lever located near the point of rotation. (See NOVA Engineering Drawing ES-PPG-8150). 5.11.11 Material of construction for chain wheel operators shall be ductile iron. Aluminium may be substituted if ductile iron is not available. 5.12

Open End Details (Valves)

5.12.1 Open-ended valves shall be equipped with either bull plugs or blind flanges. 5.13

Check Valves

5.13.1 Check valve selection should be as directed in the applicable piping class and its notes. See NOVA Engineering Guideline EG-VLV-0101 Valves, Selection / Design Guideline and consult with process engineering should further direction be required when selecting the check valve style. 5.13.2 Spring-loaded check valves are recommended for pulsating services. 5.13.3 Swing checks and piston check valves shall be located in the horizontal or in vertical pipe when the flow is upwards. Piston checks used in the vertical must be equipped with springs. 5.13.4 Ball type check valves shall only be used in low-pressure water services. The user is cautioned in the use of 'Ball Check Valves'. When the piping layout dictates, these types of check valves should only be used in vertical lines with upward flow. In this case the choice of spring is optional. The use of ball checks is not recommended for use in horizontal lines due to gravity effect causing the ball to roll off the seat. If absolutely necessary, ball checks in horizontal lines must have springs to assist closing. The user must consult the valve manufacturer for specific application recommendations.


NOVA Chemicals


Initial Issue Date: 28.07.1999 5.14

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Wafer Type Valves

5.14.1 Non Lugged wafer type valves with exposed studs are not permitted in the following services due to the potential relaxation and weakening of their long studs / bolts in case of fire.   

 

5.15

Flammable materials including hydrocarbons lighter than 68° (degrees) API Toxic materials such as phenol, hydrogen sulfide, and chlorine Highly corrosive materials such as acid, caustic and other materials that may potentially injure personnel Oxygen and auto-ignition services Boiler feed water and steam service above ASME Class 300

Vents and Drains

5.15.1 Vents and drains generally fall into two (2) categories: ‘Process or Operational’ : Those required to operate the system as required by design or required to fulfill safety requirements. All ‘Process’ and ‘Operational’ vents and drains must be shown the P&ID's and piping isometric drawings. Field changes to reduce or eliminate these vents and drains shall not be permitted except with an Engineering Variance. Such vents and drains are required at high and low points in the piping to eliminate potential of liquid accumulation on dead legs, especially on long rack lines. All vent and drain installations shall be as directed in the applicable NOVA Piping Line Class and in accordance NOVA Engineering Standard ES-PPG1507 Piping, Vents and Drains. 5.15.2 The other category, ‘Hydrostatic Test’ : Those required at critical locations in order to successfully complete the required piping hydrostatic test. Vents shall be field located at high points in the system as well as drains at low points. Additional vents and drains to the ‘Process’ vents and drains are not required if the hydrostatic test can be performed with only the ‘Process’ vents and drains. 5.15.3 In general, venting and draining shall be accomplished through vessel and / or equipment connections. Vessel vents and drains may be located in overhead or bottom piping provided no valves or blinds are located between vent or drain connections and vessels. Bottom drain piping leaving a vessel may be positioned in a branched position 90° (degrees) from the direction of flow, and not in the direct path of flow, and using as short a branch as possible to avoid any excessive dead-pocket and solid accumulation that may promote corrosion in the drain line. 5.15.4 The minimum size vents and drains located on overhead or bottom piping for the purpose of venting and draining of vessels shall be: Vessel Volume

Vent Size (NPS)

Drain Size (NPS)

¾

1

Cubic Feet 50 and under

Cubic Meters 1.42

51 to 200

1.43 to 5.66

1

1½

201 to 600

5.67 to 16.99

1

2

601 to 2500

17.0 to 70.8

1½

3

Over 2500

Over 70.8

2

3


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5.15.5 The minimum size bleed valve between two (2) block valves (double block and bleed) shall be NPS ¾ size. 5.15.6 Drains emptying into open receptacles shall terminate 2 inches (50 millimeters) above the top of the drain receptacle so that the discharge shall be visible from the location of the drain valve. 5.15.7 All process vents and drains shall be valved and plugged with either a plug or a blind flange. Vents for hydrotesting, however, need not be valved. 5.16

Bypasses

5.16.1 Bypasses around equipment shall be supplied only to the extent shown on the P&ID’s. Supply break flanges for isolation (i.e.: by-pass around PSVs). 5.17

Instrument Connections

5.17.1 All instrument connections shall be as directed in the applicable NOVA Piping Line Class and in accordance with NOVA Engineering Standard ES-PPG-1506 Piping, Instrument Gauge Valve Connections. 5.18

Gusseting

5.18.1 The following are the minimum requirements for gusseting of dead ended operating and instrument connections (i.e.: vents, drains, pressure taps and orifice taps etc.) under NPS 2 which are subject to high cantilever motion / fluctuation. Consultation should additional gusseting may be called for based on site experience 5.18.2 Isometrics are to clearly identify which connections require gusseting and reference the engineering detail. 5.18.3 Threaded connections do not require gusseting. If you require gusseting in threaded utility services due to past experiences then the connection shall be welded. 5.18.4 Gusseting shall be in accordance with Engineering Standard Drawings ES-PPG-8117A / 8117B, Small Bore Branch Connections Gusseting Details when:   

Connection is less than NPS 2 Originating header is ≥ NPS 3 When the connection is on any Primary Equipment or Service Category identified in Table 1 below


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Table 1: Bracing of Piping Connections Primary Equipment Or Service Category

5.19

The First Nipple and Valve Shall Be Braced as Follows

Reciprocating or Screw Compressors

Connections to interstage, upstream and downstream piping and equipment associated with reciprocating compressors (Includes first major piece of equipment upstream and downstream of compressor). (Pulsation bottles are to be considered as part of the compressor.)

Centrifugal Compressors and Steam Turbines

Connections to piping within the greater of 20 feet (6 meters) or 20 pipe diameters, measured along the pipe axis from the equipment nozzle.

Centrifugal Pumps and Rotary Pumps

Connections to pump piping within the greater of 20 feet (6 meters) or 20 pipe diameters, measured along the pipe axis from the equipment nozzle.

Centrifuges

Connections to centrifuge piping within the greater of 20 feet (6 meters) or 20 pipe diameters, measured along the pipe axis from the equipment nozzle.

Machinery where rotating or reciprocating component speed range is 60 to 1000 rpm (1 to 17 rev/s)

Connections to all piping connected to or supported from any type of rotating equipment or its supporting structure. (Includes first major piece of equipment upstream and downstream of machine.)

Piping or Equipment subject to Process Induced Vibration

Connections to piping or equipment subject to process induced vibration (e.g.; fluid solids units, lines in two-phase flow, hydraulic shock from rapid valve operation, high pressure letdown systems.)

Other

Any process system that has been identified by Engineering or Maintenance as having vibration problems in the past and will likely experience vibration in the future.

Pressure Testing

5.19.1 Piping systems shall be pressure tested in accordance with NOVA Engineering Standard ESPPG-1201 Piping, Pressure Testing for Piping and Equipment.

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6.

PIPE SUPPORTS

6.1

Thermal Movement

6.1.1

Provision for thermal expansion and contraction shall be allowed for in all piping in accordance with the requirements of the governing codes and NOVA Engineering Standard ES-PPG-0207 Piping, Piping Flexibility.

6.1.2

Thermal expansion requirements shall also take into account the steam-out conditions.

6.1.3

Provision for thermal expansion shall be made with pipe expansion loops. Expansion joints shall only be used with NOVA’s approval.

6.1.4

All piping systems shall be designed so that the loads and movements applied at the flanges of mechanical equipment, such as rotating equipment, shall not exceed the permissible reactions for the equipment as specified by the manufacturers of the equipment and the applicable codes.

6.2

Supports

6.2.1

Design of supports shall be in accordance with NOVA Engineering Standards ES-PPG-1601 through ES-PPG-1604 and NOVA Engineering Standard Drawings ES-PPG-8300 through 8900.

6.2.2

All piping shall be adequately supported to prevent excessive deflection and vibration and the transmission of excessive loads to vendor supplied equipment.

6.2.3

Pipe support details shall be provided for all piping NPS 3 and above and all alloy piping. Pipe support details shall also be provided for NPS 2 pipe with an operating temperature above 250°F (121°C).

6.2.4

Pipe supports, guides, anchors, etc., shall be detailed and the proper location indicated on the piping drawings or the pipe support location drawings.

6.2.5

Spring supports shall be supplied in their pre-compressed condition with travel stops in place. Travel stop will be removed after piping installation and hydrotesting has been carried out.

6.2.6

Supports on alloy piping shall be either welded or clamped. Welded or clamped attachments shall be the same material specification as the pipe. Any deviation shall be approved by NOVA Engineering. If alternate materials are being considered, they should have similar mechanical properties (strength, temperature resistance, thermal expansion coefficient) and shall be selected such that galvanic corrosion will not occur.

6.2.7

Pipe supports shall not be attached to equipment other than pressure vessel and towers.

6.2.8

Pipe supports around equipment that may require regular maintenance, i.e.: pumps or compressors, should be positioned to allow removal of the equipment without the installation of temporary pipe supports.

NOVA Chemicals

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28.07.1999 6.2.9

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The span between pipe supports shall be selected to limit pipe deflection. Refer to NOVA Engineering Standard ES-PPG-1602 Piping, Allowable Pipe Span Between Supports.

6.2.10 Small diameter lines (NPS 2 and below) in a bank of large diameter piping, shall be supported in such a manner that the support spacing of the piping is not governed by the maximum allowable span of the small diameter lines. Special provisions shall be made for supporting these small lines. Refer to NOVA Engineering Standard ES-PPG-1602 Piping, Allowable Pipe Span Between Supports for allowable spans between supports. 6.2.11 Piping shall not rest directly on ground floors, roof or walkways. 6.2.12 Overhead piping shall be supported beneath the pipe in preference to hanger-type supports. 6.2.13 Piping systems shall be analyzed for flexibility stresses in accordance with NOVA Engineering Standard ES-PPG-0207 Piping, Piping Flexibility. 6.3

Hangers

6.3.1

The supporting of piping from other piping is not recommended.

6.3.2

The use of spring hangers is required where vertical expansion precludes the use of a rigid support.

6.4

Pipe Spacing

6.4.1

The Pipe Support Spacing Chart shall govern the minimum pipe spacing of piping. See NOVA Engineering Standard ES-PPG-1602 Piping, Allowable Pipe Span Between Supports.

6.4.2

Provide additional clearance between pipes on pipe racks where expansion or contraction will occur.

6.4.3

Allow space along the top level of pipe racks for routing of power and control cable trays and flare headers.

6.4.4

Piping should be arranged to permit mobile equipment access within the plant for maintenance of equipment.

6.5

Guides

6.5.1

Guides are to be located to restrict lateral movement of piping without impairing the flexibility of the piping system. Place guides four (4) to six (6) pipe diameters away from expansion loops and changes in direction. In general, guide lines NPS 4 and smaller at every other pipe support and lines NPS 6 and larger at every third support. Stagger the supports on adjacent lines to better distribute loading on the pipe supports.

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6.6

Shoes

6.6.1

Insulated and traced pipe shall be mounted on a shoe.

6.6.2

Shoe length shall be 12 inches (300 millimeters) minimum or twice the maximum anticipated pipe movement at its support location. It is sometimes necessary to offset the shoe location during erection to accommodate future thermal growth. This offset should be indicated on either the piping plan or the pipe support and isometric drawings.

6.7

Anchors

6.7.1

All pipes shall be anchored at the plant battery limit to avoid transferring offsite movement to each of the adjacent process plants.

6.7.2

Anchor shall provide sufficient fixation to transmit all loads into the foundations or structure.

6.7.3

Suction and discharge piping on reciprocating equipment shall be given special anchoring considerations.

6.7.4

Underground piping with mechanical joints shall be provided with thrust blocks at all direction changes.

7.

PUMPS AND COMPRESSOR PIPING

7.1

Pump Suction Piping

7.1.1

Arrange the suction piping on pumps as directly as possible and eliminate all pockets.

7.1.2

Start up temporary strainers shall be installed on all pump suction lines, unless otherwise specified on the P&ID’s. See strainer selection guide at Section 16 and NOVA Engineering Drawings ES-PPG-8222 Strainer Design and Mesh Information, ES-PPG-8223A Strainer – Bathtub (T) Type and ES-PPG-8223B Strainers – Cone and Basket Type.

7.1.3

For pumps with horizontal suction lines, provide at least six (6) pipe diameters of straight pipe between the pump suction and the last fitting (e.g.: valves, elbows, thermowells, etc.).

7.2

Pump Piping Arrangements

7.2.1

Piping shall be designed to ensure that nozzle loads are as low as possible, ideally, no load in cold condition. In no case shall the maximum nozzle loads as specified by the pump manufacturer be exceeded.

7.2.2

Piping at pumps shall be arranged and supported to facilitate removal of internal elements and case sections without providing temporary supports.

7.2.3

Pump suction and discharge piping shall be supported from overhead if possible. This is to eliminate the effects of potential differential settlement between pump base and pipe supports.

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7.2.4

Provide removable pipe spools between the block valves and the pumps or drivers to facilitate maintenance. The pump's immediate connecting suction and discharge piping shall have positive shutoff, drains / vents, and tell-tale provisions to ensure complete isolation, depressurization and de-inventory for servicing the pump. Refer to NOVA Engineering Drawing ES-PPG-8079 Typical Pump Piping Arrangement at Appendix C.

7.2.5

Gland and sealing oil systems and cooling water piping shall be designed in accordance with the pump manufacturer’s recommendations.

7.2.6

Valves in pump suction piping shall be line size. Valves in pump discharge piping NPS 3 and larger may be one (1) size less than line size, but no smaller than the pump discharge nozzle diameter. The discharge line from centrifugal or rotary pumps shall be provided with a check valve between the pump and the block valve. For vertical discharge pumps, the check valve shall be located in the vertical line wherever practical. Suction and discharge lines of pumps shall be drained through drains located at the low point of the pump casing whenever possible.

7.2.7

The drain valve of the pump discharge pressure indicator may be used to vent the pump casing if the piping configuration warrants.

7.2.8

Casing vents on pumps in light hydrocarbon and hazardous material services shall be piped back to the vapour space of the source or another suitable vessel.

7.2.9

Where an eccentric reducer flat on top is used on pump suction, a drain valve shall be provided.

7.2.10 Drain valves shall be provided on all pump casings except for pumps in extremely corrosive or erosive services. For these pumps, drains shall be provided on the piping. 7.3

Compressor Piping Arrangement

7.3.1

Piping shall be designed within the manufacturer ’s recommended nozzle loading.

7.3.2

Compressors shall be piped without any pockets between the surge drum and the compressor. If this arrangement becomes impractical, a drainage system shall be implemented. Top inlets should be utilized to eliminate low points.

7.3.3

Temporary suction strainers shall be installed to protect the compressor against entry of extraneous solid materials. These strainers shall be removed after start-up and a spool piece should be included in the suction piping design to remove these strainers. The strainer shall have a free area of 1.5 times the suction line area. See strainer selection guide at Section 16 and NOVA Engineering Drawings ES-PPG-8222 Strainer Design and Mesh Information, ES-PPG8223A Strainer – Bathtub (T) Type and ES-PPG-8223B Strainers – Cone and Basket Type.

7.3.4

No protruding objects (such as thermowells) shall be located in the suction piping of any type of compressor.

7.3.5

Process and auxiliary piping shall be routed to provide easy access to the compressor, gearbox and driver for operation, inspection and maintenance. Arrange all piping to allow free clearance completely around each machine.

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7.3.6

Lube and seal oil consoles shall be located locally to the compressor building to minimize piping to and from the compressor. Refer to NOVA Engineering Guideline EG-MAC-0701 Guideline for Lubrication, Shaft-Sealing, Control-Oil, Instrumentation, Electrical and Piping Systems for Rotating Equipment Trains and Package Units. Return oil lines to the console should be designed to be self-draining back to the console.

8.

PRESSURE RELIEF PIPING AND DEPRESSURING SYSTEMS NOTE: This engineering standard does not outline the overpressure protection requirements for piping and equipment. It is the responsibility of process engineering to outline the relief requirements to piping and that these requirements comply with those specified in the NOVA Process Engineering Standards.

8.1

General

8.1.1

All PSVs shall be accessible from grade or a platform, for servicing and inspection.

8.1.2

Relief piping, including safety, relief valve and rupture disk discharge lines and de-pressuring systems, whether discharging to closed or open systems, shall be designed in accordance with ASME B31.3 (ASME B31.1 for boiler relief piping), API RP-520 and API RP-521. Special consideration shall be given to forces and dynamic loading during relief situations, including ‘normal’ and extraordinary conditions. Consideration shall be given to performing stress analysis in accordance with NOVA Engineering Standard ES-PPG-0207 Piping, Piping Flexibility.

8.1.3

Supports and connections should be designed to facilitate the removal and replacement of the relief device.

8.1.4

Refer to attachments, NOVA Engineering Drawings ES-PPG-8075 Pressure Relief Discharge to Flare, ES-PPG-8076 Safety Valve Discharge to Atmosphere – Utility Service and ES-PPG-8077 Safety Valve Discharge to Atmosphere – Boiler Service for inlet and outlet piping design consideration.

8.1.5

When a PSV discharges to a flare system, the safety valve shall be mounted at an elevation higher than the flare header and connected into the top of the flare header so as to ensure the piping is self-draining.

8.1.6

All PSVs are to be installed in the vertical position.

8.2

Over Pressure Protection Requirements

8.2.1

This document does not outline the overpressure protection requirements for piping and equipment. It is the responsibility of process engineering to outline the relief requirements and that these requirements comply with those specified in the NOVA Engineering Process Design Standards EG-PRO-0104 through EG-PRO-0109.

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9.

LAYOUT OF PIPING AROUND STATIC EQUIPMENT

9.1

General

9.1.1

The P&ID’s and the Equipment Location Plan govern piping arrangements. Consideration must be given to removal and maintenance of equipment. Heat exchanger bundle removal clearances and other equipment drop out areas must be clearly indicated on piping arrangement drawings.

9.1.2

Piping connected to equipment such as heat exchangers, heaters, pressure vessels, boilers and storage tanks shall be routed and supported in such a way that loads imposed on the connections are within the equipment limitations or below designer’s (manufacturer’s) recommendations.

9.2

Heater Piping

9.2.1

Fuel gas piping shall be designed in accordance with CSA / CGA B149.1 and CSA / CGAB149.3.

9.2.2

All piping manifolds shall be designed for uniform flow distribution.

9.2.3

Headers shall slope by ¼ inch per foot (21 millimeters per meter) from the isolation valve towards the end drain. Blow out connections for clearing dirt and foreign matter shall also be provided.

9.2.4

Plug or ball valves in burner piping shall have position indicating handles or pointers.

9.2.5

Take-offs to individual burners shall be from the top of the headers with shutoff valves at the header and the burner. Breakaway connections shall be located as close to the burners as practically possible.

9.2.6

Burner valves are to be located adjacent to the flame observation window so that any adjustments to the flame can be observed.

9.2.7

Burner fuel gas and pilot shutoff valves shall be adjacent to the header. An extra pilot gas shutoff valve shall be located at the burner. It must be possible to operate the valve with one (1) hand while observing the pilot and lighting it with the other hand.

9.2.8

Flexible hose may only be used when shown on the P&ID's and documentation of flexible connections must comply with applicable site standard.

9.2.9

Steam supply to heaters shall be from a dedicated steam header and not from sub-headers to avoid inadvertent shutoff.

9.2.10 Manual gas SHUTOFF VALVES including gates, globes, butterfly, etc., in fuel gas service around fuel gas burning appliances in Ontario are subject to Technical Standards and Safety Authority (TSSA) Fuels Branch field approval and must meet the requirements of CSA / CGA 3.16-M88. Ensure this is clearly specified in the purchase order or on the valve datasheet(s).

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9.3

Vessel Piping

9.3.1

Vessels shall be provided with a low point drain. This drain should be piped to a process sewer or collection drum.

9.3.2

Vessels mounted on a skirt shall have their drains piped outside the skirt.

9.3.3

Piping on vertical vessels shall be located, when possible, radially about the vessel on the pipe rack side. Manways and platforms shall be located on the access side. Manways shall normally be lined up vertically on the same centreline.

9.3.4

Manways shall be located 3 feet (0.9 meters) above an access platform.

9.3.5

Davits for handling internals, relief valves, etc. shall be provided on vessels in excess of 30 feet (10 meters) in height. Davits shall be orientated to operate on the vessel access side.

9.3.6

Use double valving on sampling and drain lines from vessels containing light hydrocarbons. One (1) valve shall be at or near the outlet from the vessel, the other shall be 3 feet (0.9 meters) downstream. The drain outlet shall not be located beneath the vessel, if it is enclosed (vessel skirt) or inaccessible.

9.3.7

Block valves shall be located on the vessel nozzle. A secondary block valve if required shall be located at the operating platform or grade.

9.3.8

Piping may be supported and guided from vessels provided that the loads are included in the vessel design.

9.3.9

Any supports attached to the vessel, such as overhead line supports, shall take into account the vessel thermal movements in operating, shutdown, steam-out or any upset conditions.

9.4

Exchanger Piping

9.4.1

Piping shall be designed to ensure exchanger channels can be unbolted and removed with minimal removal of piping. See also NOVA Engineering Guideline EG-EXG-0101 Shell and Tube Heat Exchangers, Design Guideline.

9.4.2

A minimum clearance of 6 inches (150 millimeters) shall be kept between pipe flanges and exchanger shell or insulation.

9.4.3

Piping around channel heads shall be provided with a flanged section between the exchanger and block valves so that full access can be provided for removal of tube bundles.

9.4.4

Piping to channels shall be provided with permanent supports so that breakout spools and channels can be removed without providing temporary supports.

9.4.5

No piping shall extend beyond the channel covers.

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28.07.1999

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9.4.6

Reboiler vapour return pipes shall rise vertically above their reboiler and turn 90° (degrees) to the tower nozzle without another offset.

9.4.7

Refer to attachment, NOVA Engineering Drawing ES-PPG-8078 Typical Exchanger Piping Arrangement for exchanger piping arrangement.

9.5

Storage Tank Piping

9.5.1

Overhead (roof) filling lines shall not be installed on storage tanks.

9.5.2

A tank pump out (NPS 3, Class 150) blinded connection shall be installed close to the tank block valve on the top of the suction line.

9.5.3

Block valves shall be provided on all storage tank nozzles connected to pipelines.

9.5.4

Thermal relief valves shall be installed as per the P&IDs.

9.5.5

Piping around tanks should be designed to minimize the effect of thermal forces and tank settlement imposed on tank nozzles. See also NOVA Engineering Standard ES-TNK-0101 Tankage, API 650 – General.

9.5.6

Fire protection services are required on all petrochemical facilities. These systems are generally either foam or water. The Local Fire Code and NOVA Loss Prevention Standards (LPS) will govern routing of such pipe.

9.5.7

Provision shall be made for a valved connection to either the inlet or outlet pipe for the hookup of foam injected to the tank.

10.

UTILITY PIPING

10.1

General

10.1.1 All utility piping shall be in accordance with the P&IDs. 10.2

Steam Piping

10.2.1 Supply and return pipes shall be connected to the top of their respective headers. 10.2.2 Block valves, blinds and low point drains shall be provided at Unit Battery Limits. 10.2.3 Permanent steam lines connected to hydrocarbon systems shall be provided with a check valve and block valve. The check valves shall be located as close to the hydrocarbon branch as possible. 10.2.4 All vents and drains on steam systems operating at 900 psig and above shall have double block and bleed valve arrangements.

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28.07.1999

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10.2.5 On all low pressure or saturated steam headers and branches, provide drip pockets and steam trap to remove condensate. Drip pocket and trap arrangements shall be provided every 90 feet (10 meters) on straight runs of pipe and at all low points. 10.2.6 Block valves on branch connections of steam headers should be positioned in the horizontal. 10.2.7 Heat exchangers handling steam are often equipped with condensate knockout pots from which the condensate is trapped and returned to the condensate header. 10.2.8 Steam-out piping shall not be permanently connected to vessels or piping, but shall be equipped with flanged valves and swing elbows for attachment to the utility nozzle. Steam-out piping shall not be connected directly to sewer lines. Refer to attachment NOVA Engineering Standard Drawing ES-PPG-8081 Typical Vessel Steam-Out Connection for details. 10.2.9 Single block valves shall be provided in branches adjacent to headers, and single block and check valves shall be provided adjacent to the point of injection of steam into any process stream to the extent shown on the P&IDs. 10.2.10 Single block valves shall be supplied adjacent to the header in the inlet line to each stem turbine and adjacent to the discharge header in the outlet line unless shown otherwise on the P&IDs. 10.3

Condensate Piping

10.3.1 Condensate lines shall be traced and insulated for winterization. 10.3.2 Condensate discharge lines that discharge to open drain shall slope from the trap to the drain point. See NOVA Engineering Guideline EG-PPG-0601 Piping, Steam Tracing Systems Design Guideline. 10.3.3 Condensate return on closed systems shall be as short as possible with isolati on and check valves and drain valves provided. 10.3.4 Condensate from bleed connections; i.e.: pump seals should be piped to oily water sewer. 10.3.5 Refer to attachment NOVA Engineering Drawings ES-PPG-8082 Equipment Condensate Drainer, ES-PPG-8083 Turbine Casing Drains and ES-PPG-8084 Turbine Governor or Steam Chest Drain for details. 10.4

Steam Trapping and Tracing

10.4.1 All steam trap piping shall be in accordance with NOVA Standard Drawings ES-PPG-8229 through 8234. 10.4.2 All steam tracing shall be in accordance with the NOVA Standard Drawings ES-PPG-8201 through 8205. 10.4.3 All steam tracing shall conform to NOVA Engineering Guideline EG-PPG-0601 Piping, Steam Tracing Systems Design Guideline.

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Initial Issue Date:



28.07.1999 10.5

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Process Cooling Water Piping

10.5.1 All process cooling water lines shall be installed so that the equipment being cooled will remain full of water in the event of a shutdown of the cooling water pumps. Shut off valves in supply branches shall be located as close to the main line as possible. Liquid thermal relief valves shall be installed on branch lines downstream of the shut off valves. 10.6

Utility Stations

10.6.1 For hook up details of utility station see attached NOVA Engineering Standard Drawings ESPPG-8085 through 8092. 10.6.2 Hose connectors for water, steam, nitrogen and air shall all be different to avoid wrong hook-up. 10.6.3 Utility stations shall be located within 50 feet (20 meters) off all major equipment that requires regular maintenance. The number and approximate location of utility stations shall be indicated on the P&IDs. 10.6.4 An NPS ¾ valved connection for utility service outlets for steam, water and air shall be provided at working platforms or grade locations, except water outlets shall generally be provided at selected grade and first level platforms. Areas to be served shall be within reach of 50 feet (20 meters) hoses. The utility outlet connections shall be grouped together. 10.6.5 The P&IDs shall govern the number and type of utilities provided at a utility station. The utility piping shall be grouped and terminated at the same elevations. 10.6.6 Subheaders shall be self-draining to the main header with low point drain provided at point of isolation. Some arrangements on the steam system may require trapping facilities. 10.7

Permanent Nitrogen Connections to Process Vessels and Lines

10.7.1 Permanent nitrogen connections to process vessels and lines are of two (2) kinds, those in continuous use (e.g.: instrument purges) and those in intermittent use (e.g.: adsorber vessels regeneration). Both require careful review using either a ‘What if?’ or a ‘HAZOP’ Hazard Analysis. 10.7.2 Considerations for continuous use connections include, a) Maximum possible process pressure must be at least 20 psig (140 kPa) lower than the normal nitrogen header pressure. b) Check valves cannot guarantee against reverse flow into a supply branch. The seal rating, tracing and insulation, etc., of all components up to and including the nitrogen branch take off should be reviewed with respect to process line contents. c) Where a regulator in a supply branch serves multiple users, the impact of reverse flow of process contents from one user on others must be considered.


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10.7.3 Consideration for intermittent use connections include: a) The decision to use a permanent connection as opposed to hose or a removable spool should consider the life cycle costs, frequency of use and the durability of the valves. b) The loss of containment through a bleed valve where double block and bleed is used. c) The potential for overpressure of the nitrogen system due to operator error, etc. 10.8

Safety Shower and Eye Wash Fountains

10.8.1 General: Safety showers and eye wash installations shall generally be located in an area where hazardous chemicals are used or stored. The potable water supply to this system should be independent from other potable water users and the supply shall be protected with a backflow preventer valve. 10.9

Potable Water

10.9.1 All new potable water distribution systems must comply with NSF61 requirements. 11.

UNDERGROUND PIPING

11.1

General

11.1.1 Piping which is to be buried should be identified on the P&IDs. 11.1.2 Underground lines shall be coated as per the NOVA Engineering Standard ES-PCL-0301 Protective Coatings for Underground Piping. 11.1.3 Underground lines shall be buried below the frost depth. 11.1.4 All buried valves shall be provided with a valve handle extension or be located in a valve box. 11.1.5 Cathodic protection is required on all ferrous underground lines. Dielectric flange set / kits should be used at the first flange joint between below and above ground piping. 11.1.6 Underground pipe is subject to varying external ‘live’ loads besides internal flow conditions that make its wall schedule / thickness sizing challenging. Therefore underground piping line-classes generally do not establish and furnish with pipe wall (e.g.: SDR) information. User shall size and select pipe wall thickness based on economics and site conditions, case by case, not only to handle the internal flow and pressure requirements, but also to withstand the external soil, traffic and live loads to prevent the pipe from collapse. 11.2

Sewers and Drainage Piping

11.2.1 Separate drainage and sewage systems (see NOVA Engineering Guideline EG-CIV-0112 Underground Sewers and Drains Guideline) shall be supplied to the extent shown on P&IDs, Flow Diagrams or underground drawings. 11.2.2 All sewer systems shall have proper traps and liquid seals at manholes and floor drains. Provide clean out connections at every change of direction on both header and branch connection.

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11.2.3 Floor drains shall be provided in process buildings and drains shall be collected and discharged to the oily water sewer / separator. 11.2.4 Drainage trenches shall be used in cases where frequent wash down of floors may be required. These trenches shall discharge to the oily water sewer through a gas trap. 11.2.5 Tundish / Funnel drain hubs shall have a minimum diameter of NPS 4. The hubs shall project 3 inches (75 millimeters) above paved or concrete floors and 6 inches (150 millimeters) above soil or gravel grade. 11.2.6 Sewer lines should, if possible, not cross-buried process lines. 11.2.7 Drains from equipment should not be directly connected to sewers without an air break. 11.2.8 Sewer and drainage pipes are generally non-pressurized and atmospheric in design. However, consideration should be given on occasional higher than normal static head surge conditions that the system may encounter in storm situation. 11.3

Fire Protection System

11.3.1 Fire water mains, hydrants and nozzles shall be installed as indicated on the fire water system flow diagrams and fire protection layout drawings. All fire protection systems all comply with NFPA requirements. 12.

NON-METALLIC PIPING

12.1

General

12.1.1 Non-metallic pipes are increasingly popular for underground sewer, drains, waste disposal and handling aggressive fluid / services because of their light weight, relative ease of installation and good corrosion resistance properties. See NOVA Engineering Guideline EG-CIV-0112 Underground Sewers and Drains Guideline, Table 1, for their applications. 12.1.2 However, these materials; namely PE; HDPE; UHMWPE; PVC; CPVC; FRP, etc., have limitations that should be considered prior to designing and installing nonmetallic piping systems. 12.2

Limitations

12.2.1 Most non-metallic pipes are generally rated according to manufacturer, e.g.: WOG or CWP lesser standards, hence tailored to and suitable for non-pressurized and / or underground gravity systems. 12.2.2 Although non-metallic materials generally have good corrosion resistance and flex properties, they may be weaker and less resistance to impacts than metallic piping especially in small bore piping and in hot application. Their supports (span and spacing), torque requirements (where applicable) and potential abuse protection, (e.g.: getting stepped on) have to be carefully designed. Manufacturer’s recommendations should be considered and followed.

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12.2.3 When used aboveground, outdoors and / or in a low temperature environment, some nonmetallic materials are prone to UV degradation and low-temperature embrittlement. 12.2.4 When selected for use on a pressure system (greater than 15 psig), follow B31.1 Chapter VII: Non-metallic Piping and Piping Lined with Nonmetals and Appendix III, for design, assembly and testing and consult local jurisdiction for registration requirements. 12.2.5 For pressurized system application, some plastic pipe and components are rated to a manufacturer's standard only and (often) are not registered with local authority. (This is material and manufacturer dependent). For regions / services, (e.g.: in Canada) where pressure component registration is required, the use of plastic piping may not satisfy local jurisdiction. 12.2.6 Material / design / construction / testing is usually covered under one (1) or more ASTM specifications. As an example, the following apply to Polyethylene pipe / fittings / hydrostatic design / heat joining and installation:      

ASTM D1248 ASTM D2657 ASTM D2774 ASTM D2837 ASTM D3350 ASTM F714

13.

WINTERIZATION

13.1

General

13.1.1 Winterization shall be considered for all liquid piping. This will be done by heat tracing or by recirculating liquids. Refer to NOVA Engineering Guideline EG-PPG-0601 Piping, Steam Tracing Systems Design Guideline. 13.1.2 The type of tracing to be used, steam, electric or glycol shall be specified on the linelist and shown on P&IDs. 13.2

Condensate Piping

13.2.1 Condensate recovery systems shall be provided with steam tracing. Glycol tracing can be used however sandwich tracing may be required to prevent boiling of glycol. 13.3

Steam Piping

13.3.1 Drip pockets and piping to and including the steam trap are to be traced on steam systems exposed to climatic conditions.

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28.07.1999 13.4

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Water

13.4.1 Intermittently operated lines in cooling water service shall have circulating bypass, vents and drains, provision for drainage or heat tracing. 13.4.2 Valves on vertical piping shall be protected by heat tracing or adequate drain facilities. 13.4.3 Dead ends of cooling water headers shall have a minimum NPS 2 valved bypass between the supply and return. This valve is normally closed. 13.4.4 Utility water branch lines to utility stations feeding from underground headers shall be traced up to the frost line. 13.4.5 Stagnant utility water headers and branch lines shall be heat traced. 13.5

Process Piping Above Grade

13.5.1 Piping shall be winterized for liquids with a freezing point above 32°F (0°C). All piping where hydrates can freeze shall also be heat traced. 13.5.2 Other points that may require heat tracing are as follows: a) Low points in piping and equipment where water or other freezing materials may accumulate. b) Where a reduction in pressure takes place in a gas or vapor line; i.e.: at a pressure reducing station and where hydrate formation can occur. 14.

INSULATION

14.1.1 The linelist shall show the type and thickness of insulation for each line that is to be insulated. Refer to NOVA Engineering Guideline EG-PPG-0105 Piping, Guideline for Linelist. 14.1.2 See NOVA Engineering Guideline EG-INS-0101 Thermal Insulation, Administrative Selection Guideline for insulation requirements. 15.

SAMPLING

15.1

General Piping Design Requirements

15.1.1 All sampling requirements shall be as per the P&IDs. 15.1.2 Piping details of sample station are to be shown on piping isometric drawings. 15.1.3 Sample stations shall be in accordance with NOVA Engineering Standard ES-IAC-1701 Analytical Instruments Sampling and Analysis, General Requirements.

NOVA Chemicals

Initial Issue Date:



28.07.1999 16.

TEMPORARY PIPING

16.1

General Requirements

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16.1.1 Use of threaded and coupled pipe is recommended on temporary utility or non-flammable service (non-hydrocarbon). For flammable or hazardous services, NOVA Engineering to provide documented approval for any temporary installations using connection types other than those specified in the applicable line class for the given service. 16.1.2 Temporary pipe supports (wooden sleepers) may be used providing that the use of wood does not pose a risk of fire due to the process temperatures. 16.1.3 Temporary insulation wrap may be applied, if required. 16.1.4 The work order must identify the time limit for the ‘temporary’ period. 16.2

Strainer Selection

16.2.1 Consideration: 



 

Mesh size to stop particles that will create an impeller imbalance. Dimensions can be provided by pump vendor Strainer ΔP to be calculated to ensure NPSH issues will not be created when clean or up to 25% (percent) loss of Open Area Ensure Temporary type strainers are oriented with the tip into the flow Mesh size should consider API Flush Plan (e.g.: Plan 11) as well as wear ring clearance, impeller eye hole size

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Initial Issue Date:



28.07.1999 Selection Flow Chart

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17.

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SWAGE NIPPLE SELECTION

17.1.1 Large end of swages are limited to NPS 4, however NPS 3 tends to be the practical limit based on industry practice and material availability.

TABLE 2 CONCENTRIC ¾

LARGE SIZE 1

1½

2

3

4

½ ¾ 1 1 1/2 ECCENTRIC ¾

LARGE SIZE 1

1½

2

3

4

½ ¾ 1 1 1/2 AVAILABLE SIZE RANGE

NOT AVAILABLE

18.

INSTRUCTIONS FOR USE OF NOVA CORPORATE PIPING CLASSES IN EXISTING NOVA FACILITIES

18.1

General

18.1.1 This instruction is not applicable to the following facilities that were designed using PDS software and currently have their own set of piping classes.   

Ethylene 3, Joffre Polyethylene II (AST), Joffre Portions of Manufacturing Infrastructure, Joffre designed modeled using PDS

18.1.2 Should the decision be made to use a legacy piping class, the responsible engineer must ensure that the installation is compliant with the current code requirements.


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New Piping Installations

18.2.1 New NOVA piping classes must be used for all new ‘stand -alone’ piping installations that do not tie to any existing piping. 18.2.2 Where an appropriate NOVA piping class is not available, the project is required to develop a new NOVA piping class for the intended service. An approved deviation is required prior to detailed design should the project elect to use a legacy piping class or an engineeri ng firm’s piping class in lieu of developing a new piping class. 18.3

New Piping Installations Connecting to Existing Piping

18.3.1 New NOVA piping classes should be used for all new piping installations connecting to existing piping that was designed to legacy piping class specifications. 18.3.2 Where the modification is considered to be minor and where the use of the NOVA piping class may lead to minimal benefits, the responsible NOVA engineer can elect to use the legacy piping class. 18.3.3 Where an appropriate NOVA piping class is not available, the project is required develop a new NOVA piping class for the intended service. An approved deviation is required prior to detailed design should the project elect to use a legacy piping class or an engineeri ng firm’s piping class in lieu of developing a new piping class. 18.3.4 Piping line class breaks (or Line-Breaks) and tie-points are required where new piping and legacy piping classes meet. 18.3.5 The affected linelists are required to be updated accordingly as shown in the examples in Section 18.5 of this document. 18.3.6 The usual ‘Hexagon’ symbol will be used with a line pointing to the tie -point. 18.3.7 The symbol adopted for piping class breaks (or Line-Breaks) should be consistent with the symbols used within the existing facility. Typically this consists of a line and a diamond shaped head with piping class labels on both side of the line as shown below:

A3A

01CS02C


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18.3.8 This symbol is applicable for use on P&ID, orthographic and isometric drawings. 18.3.9 Some actual examples of the use of piping class breaks (Line-Breaks) are shown in Section 18.5 of this document. 18.3.10 For butt-welding connections at the piping class break point, counter-boring of the thicker pipe in accordance with ASME B16.25 may be necessary when pipes to be joined are of different wall schedules (wall thickness). 18.4

Replacement in Kind

18.4.1 New NOVA piping classes should nor mally be used for ‘Replacement -in-Kind’ situations. When this is the case, the same rules as outlined Section 18.3 of this document should be adhered to. 18.4.2 The responsible NOVA Engineer can elect to use the legacy piping line class if it is considered not practical or of little value to use a new NOVA piping class. Existing drawings will be used. Piping class breaks (or Line-Breaks), tie-points and linelist modifications are not required. The responsible NOVA Engineer must ensure that the legacy specification is complaint with current code and does not pose any additional risk. 18.5

Examples of Using New Piping Classes

18.5.1 New Line Branching Off An Existing Line Using a Tee.

A3A

X

6”-P12345-A3A

01CS02C

A3A

6”-P12345-A3A

Y

6”X4” RT 6”-P12345-01CS02C 4”-P13579-01CS02C

Z

Note: Engineer may elect to use a legacy line class on the header in which the specification break is moved to the branch.

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18.5.1.1 The existing linelist is shown below: Size

Service Code and Sequence No.

Pipe Class

From

To

6”

P12345

A3A

X

Y

18.5.1.2 The new linelist is shown below. Note that the original line P12345 is replaced with three (3) entries on the linelist with different Pipe Class / From / To descriptions. Size


Pipe Class

From

To

6” 6” 6” 4”

P12345 P12345 P12345 P13579

A3A 01CS02C A3A 01CS02C

X Spec. A3A Spec. 01CS02C P12345

Spec. 01CS02C Spec. A3A Y Z

18.5.1.3 In the sketch in Section 18.5.1, weld symbols are shown for clarity. These weld symbols are required only on orthographic and isometric drawings but not on the actual P&ID. 18.5.2 New Line Branching Off an Existing Line Using a Weld-O-Let

X

6”-P12345-A3A

Y 6”X3” WOL

3”-P13579-01CS02C

Z

18.5.2.1 The existing linelist is shown below: Size


Pipe Class

From

To

6”

P12345

A3A

X

Y


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18.5.2.2 The new linelist is shown below. The existing line six (6) inch-P12345-A3A is unchanged. Only the new line three (3) inch-P13579-01CS02C is added. Note that a piping class break (or Line-Break) is not required in this case as the pipe class is already uniquely defined by the new line. Size


Pipe Class

From

To

6” 3”

P12345 P13579

A3A 01CS02C

X P12345

Y Z

18.5.2.3 In the sketch in Section 18.5.2, weld and weldolet symbols are shown for clarity. These symbols are required only on orthographic and isometric drawings but not on the actual P&ID. 18.5.3 Adding a Valve to an Existing Line

NEW

X

6”-P12345-A3A

Y

18.5.3.1 The Engineer is responsible to ensure that valve to be installed complies with the current valve and equivalent line class however the P&ID does not have to be updated to detail a specification break between the legacy and new equivalent line class. Piping isometric must be updated to reflect the current NOVA valve code.

NOVA Chemicals

Initial Issue Date:



28.07.1999 19.

APPENDIX A – DEFINITION OF TERMS

19.1

Definitions of Standard Engineering Terms

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Code: A group of standards referring to the same topic or protocol. Criteria: All the compulsory requirements relating to the work in hand as set forth in the Engineering Guideline. Discrepancy: Difference between, for example, a drawing and a written procedure. Exceptions: Irregularities; exceptions to the rule / standard, etc. Governance of Documents: The order of precedence to be taken when referring to documents governing the work referred to in this Guideline. Guidelines: A document that describes the preferred way to achieve engineering objectives. Procedures: Step-by-step action plan description. Quality Assurance (QA): An assurance made by the Supplier for the level of safety, quality and performance of their product(s) or service(s). Quality Control (QC): Primarily concerned with the procedures and processes in place to guarantee the specified product or service. References: Any materials used in the compilation of this Guideline. Regulation: A law enforceable document issued originally by a government entity. Standard: A document that describes the mandatory ways to achieve engineering objectives. Variance (Major): That which has a major impact on the equipment or process design. Variance (Minor): design.

That which has very little or no impact on the equipment or process


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Definitions of Engineering Discipline Terms Anchor: A pipe support that allows no movement or rotation in any direction. Block Valve: Valve used to isolate equipment. Directional Stop: A pipe support that restricts movement in a certain direction. Equipment Location Plan: A drawing that locates equipment within the plant and sets its height above the plant elevation datum. Guide: A pipe support that directs the movement of a pipe in a predetermined direction. P&ID: Piping and Instrumentation Diagram. PSV: Pressure Safety Valve.

20.

APPENDIX B – LINKS TO STANDARD NOVA DETAIL DRAWINGS WEBPAGES

20.1.1 This list of drawings should be used for reference when reading this standard: Drawing Number

Drawing Title

ES-PPG-8001 – 8235

Piping, Standard Detail Drawings

ES-PPG-8300 – 8900

Pipe Support Standard Detail Drawings

ES-PPG-8300M – 8900M

Pipe Support Standard Detail Drawings – Metric Version

piping Layoutes Ppg 0201

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