Typical Systems Depiction for PIDs

K vaerner vaerner Powergas

Typical Systems Depiction for P&ID’s

PS.05.03-04 Rev. 00 Page 1 of 38 of 38

CONTENTS

1. INTRODUCTI INTRODUCTION........ ON.............. ............. .............. .............. ............. ............. .............. ............. ............. .............. .............. ............. ............. .............. .............. ............. ............4 ......4 2. APPLICATION... APPLICATION.......... ............. ............. .............. ............. ............. .............. .............. ............. ............. .............. ............. ............. .............. .............. ............. ............. .............. ......... 4 3. GENERAL GENERAL ............. .................... .............. .............. ............. ............. .............. ............. ............. .............. .............. ............. ............. .............. .............. ............. ............ ............. ............4 .....4 4. TYPES OF P&ID’s P&ID’s .............. ..................... ............. ............. .............. .............. ............. ............. .............. ............. ............. .............. .............. ............. ............. ............. ...........4 .....4 4.1

Process Process P&ID .............. ..................... ............. ............. .............. .............. ............. ............. .............. ............. ............. .............. .............. ............. ............. .............. .............5 ......5

4.2

Offsites Offsites and Utility Utility Generation Generation (O&U) P&ID: ............. .................... .............. .............. .............. ............. ............. .............. .............. ......... ..5 5

4.3

Utility Utility Distrib Distribution ution P&ID:....... P&ID:.............. .............. ............. ............. .............. ............. ............. .............. .............. ............. ............. .............. ............. ..............5 ........5

5. LAYOUT LAYOUT OF THE P&ID’s ............. .................... ............. ............. .............. .............. ............. ............. .............. .............. ............. ............. .............. ............. ............6 ......6 5.1

EQUIPMENT EQUIPMENT ............. .................... .............. ............. ............. .............. ............. ............. .............. ............. ............. .............. ............. ............. .............. ............. ..............6 ........6

5.2

PIPING PIPING ............. .................... ............. ............. .............. .............. ............. ............. .............. .............. ............. ............. .............. ............. ............. .............. .............. ............. ..........7 ....7

5.3

INSTRUMENTA INSTRUMENTATION TION...... ............. .............. ............. ............. .............. ............. ............. .............. .............. ............. ............. .............. .............. ............. ............8 ......8

5.4

ELECTRICAL....... ELECTRICAL.............. ............. ............. .............. .............. ............. ............. .............. .............. ............. ............. .............. ............. ............. .............. ............. ............9 ......9

6. TYPICAL TYPICAL ASSEMBLIES.. ASSEMBLIES......... .............. .............. ............. ............. .............. .............. ............. ............. .............. ............. ............. .............. .............. ............. ............9 ......9 6.1

Typical Typical control control valve installati installation on .............. .................... ............. .............. .............. .............. ............. ............. .............. .............. .............. ............. .........9 ...9

6.2

Steam trap assembly assembly ............. .................... .............. .............. ............. ............. .............. .............. .............. ............. ............. .............. .............. .............. ............. ........ 10

6.3

Battery Battery limit limit conditions conditions .............. .................... ............. .............. .............. .............. ............. ............. .............. .............. .............. ............. ............. .............. ......... ..10 10

6.4

Cooling Cooling water water header........ header.............. ............. .............. .............. .............. ............. ............. .............. .............. ............. ............. .............. .............. .............. ............11 .....11

6.5

Flare header .............. ..................... ............. ............. .............. .............. .............. ............. ............. .............. .............. .............. ............. ............. .............. ............. ............ ........ 11

6.6

Safety Safety valve valve discharging discharging to atmosphere atmosphere .............. ..................... ............. ............. .............. .............. .............. ............. ............. .............. ...........12 ....12

6.7

Thermal Thermal relief relief valve discharging discharging to atmosphere atmosphere ............. .................... .............. .............. .............. ............. ............. .............. ............13 .....13

6.8

Safety Safety valve valve discharging discharging to closed closed system system .............. ..................... .............. ............. ............. .............. .............. .............. ............. .............13 .......13

6.9

Desuperheate Desuperheaterr .............. ..................... ............. ............. .............. .............. ............. ............. .............. ............. ............. .............. .............. ............. ............. .............. ...........14 ....14

6.10 Centrifugal Centrifugal pump installati installation on ............. .................... .............. .............. ............. ............. .............. .............. .............. ............. ............. .............. ............. ........ 14 6.11 Pump vent/drain... vent/drain.......... .............. .............. ............. ............. .............. .............. .............. ............. ............. .............. .............. .............. ............. ............. .............. ...........15 ....15 6.12 Minimum Minimum flow bypass with with restrictio restriction n orifice/contro orifice/controll valve ............. .................... .............. ............. ............. ..............16 .......16

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PS.05.03-04 Rev. 00 Page 2 of 38 of 38

6.13 Typical Typical positive displacem displacement ent pump installation installation ............. .................... .............. .............. .............. .............. .............. ............. ..........16 ....16 6.14 Positive Positive displacement displacement pump capacity capacity control .............. ..................... .............. ............. ............. .............. .............. .............. ............. ........ ..18 18 6.15 Atmospheric Atmospheric storage storage tank venting arrangement arrangement .............. .................... ............. .............. .............. .............. ............. ............. .............18 ......18 6.16 Blanketed Blanketed tanks .............. ..................... .............. ............. ............. .............. .............. .............. ............. ............. .............. .............. .............. ............. ............. ............. ........ 19 6.17 Tank heating arrangement arrangement .............. ..................... ............. ............. .............. .............. .............. ............. ............. .............. .............. .............. ............. ...........19 .....19 6.18 Typical Typical floating floating roof tank installation installation .............. ..................... ............. ............. .............. .............. ............. ............. .............. ............. ............. ......... 20 6.19 Truck loading loading arm ............. .................... .............. .............. ............. ............. .............. .............. ............. ............. .............. ............. ............. .............. .............. ...........21 ....21

Figure 1: Typical control valve installation ......................................................................................22 Figure 2: Steam trap assembly ..........................................................................................................22 Figure 3: Battery limit installation.....................................................................................................23 Figure 4: Cooling water header..........................................................................................................24 Figure 5: Flare header ............................................... .................................................... ......................................................................... ..................... 25 Figure 6: Safety valve discharging to atmosphere ............................................................................26 Figure 7: Thermal relief valve discharging to atmosphere .............................................. .................. 27 Figure 8Single PSV discharging to closed system ............................................. ............................... 27 Figure 9: PSV with spare discharging to closed system....................................................................28 Figure 10: Desuperheater...................................................................................................................28 Figure 11: Typical centrifugal pump installation...............................................................................29 Figure 12: Pump vent/drain ................................................. ................................................... ........... 29 Figure 13: Pump vent/drain (lights)...................................................................................................30 Figure 14: Minimum flow bypass with restriction orifice.................................................................31 Figure 15: Minimum flow bypass with control valve........................................................................32 Figure 16: Typical positive displacement pump installation ................................................ ............. 33 Figure 17: Positive displacement displacement pump capacity control ......................................... ......................... 33 Figure 18: Atsmopheric storage tank venting arrangement...............................................................34 Figure 19: Blanketed tanks (pressure controller)...............................................................................34




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Figure 20: Blanketed tanks (self actuated PCV)................................................................................35 Figure 21: Tank heating (manual control) ............................................... .......................................... 35 Figure 22: Tank heating (automatic control) ............................................. ........................................ 36 Figure 23: Typical floating roof tank installation..............................................................................37 Figure 24: Truck loading arm ..................................................... ............................................................................................................ ....................................................... 38


K vaerner Powergas

1.

PS.05.03-04 Rev. 00

Typical Systems Depiction

Page 4 of 38

for P&ID’s

INTRODUCTION

This Design Guide indicates the format and the basis to be used in the preparation of Piping and Instrumentation Diagrams ( P&ID’s). The basis provided in the document is to be followed, unless client’s comments or special process requirements dictate otherwise.

2.

APPLICATION

This Design Guide is intended for use in basic, front-end projects. For detail engineering projects, modifications or expansion of existing facilities, the philosophy followed by the licensor shall be followed. This guideline is to be used by process engineer during P&ID development.

3.

GENERAL

The Design Guide must be read in conjunction with the following documents

PS.06.01-03 Piping Philosophy for P&ID’s PS.06.02-03 Instrumentation philosophy for P&ID’s

P&ID Legend : Drg No. Sample Connections : Drg No Pump Seal Plans : Drg No.

4.

TYPES OF P&ID’s

A Piping and Instrumentation diagram is a schematic and symbolic representation that provides detailed information of the piping and instrumentation as well as the special features.


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This document is one of the most important documents and is the basis for detailed design and engineering, construction and operation of the plant. The following types of P&ID are prepared for any project ♦

Process P&ID

♦

Offsites and Utility Generation (O&U) P&ID

♦

Utility distribution P&ID

4.1

Process P&ID

The process P&ID defines the process equipment, piping, process control and instrumentation of the plant. This is developed for basic engineering projects and obtained from the process licensor for detailed engineering projects.

4.2

Offsites and Utility Generation (O&U) P&ID:

The Utility generation P&ID’s define the equipment, piping, process control and instrumentation for generation of the utilities required by the process plant. Typically these will include Water Systems (Raw water, Cooling water, Service water, DM water etc), Air Systems (Instrument, Plant air), Inert gas systems (Nitrogen, Fuel gas), Steam systems, Effluent collection and treatment.

Offsites P&ID defines the equipment, piping, process control and instrumentation for the storage and transfer facilities for feed, products, intermediates etc.

The O&U P&ID’s are generally developed by the detail engineering contractor based on the requirements of the process plant.

4.3

Utility Distribution P&ID:

This diagram shows the headers, subheaders, branches required for connectiong the utility system from the supplier to the users within the plant. The layout of the diagram is based on the layout.


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for P&ID’s

This P&ID is also referred to as a Utility Flow Diagram (UFD). This is developed by the Piping group based on the layout and the line sizes are checked the process department.

5.

LAYOUT OF THE P&ID’s

The layout of the P&ID is very important. When too many equipment or information is shown in a P&ID, the information can become unclear.

Each P&ID should not contain more than 4-6 pieces of equipment. The addition of notes, instrument details, piping requirements during the course of engineering must be kept in mind while laying out the drawing.

The engineer shall try, as far as possible, to maintain the relative elevation between equipment especially while depicting gravity flows.

Equipment numbers and description shall be entered at the top of the drawing.

All notes shall be numbered sequentially and placed in the right hand side of the P&ID.

5.1

EQUIPMENT

1. All equipment including standby equipment shall be indicated. If it is required to repeat equipment on another P&ID, the equipment should be shown as dotted on the subsequent drawing. 2. The equipment tag number shall be placed as close to the vessel as possible. The tag number along with the equipment description should be indicated at the top of the drawing. 3. The vendor supplied packages are indicated only as a dashed / dotted box with the vendor P&ID drawing number referenced within the block.


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4. The major internals of the equipment like demister pad, dip pipe, vortex breaker should be indicated. For tray columns, the tray numbers at critical locations of feed, side draw off, pump around, top and bottom tray should be indicated. The packed column must indicate the number of packed sections and special internals like spray nozzles. 5. All nozzles on the equipment should be indicated including manhole/handholes, nozzles with blind flanges. Nozzle size / rating to be shown only if different from connecting line size. 6. Notes on critical elevation should be added as required. 7. Future requirement of equipment should be indicated only by means of a note.

5.2

PIPING

1. All process and utility lines should be indicated. All lines will have the same thickness. 2. Indicate arrows along the lines to show flow direction. 3. All process lines entering or leaving a drawing should terminate at the right or left hand side of the drawing with a continuation arrow. Utility lines can be terminated at any convenient location in the drawing. 4. The line entering or leaving a P&ID shall indicate 5. The continuation drawing number within the arrow 6. The origin or destination equipment item / line prefixed by “TO” or “FROM” as required. 7. The lines should be tagged as per the piping philosophy for the project. This should have line size, service designation, line number, piping spec as a standard. 8. All special piping requirements E.g. slope, no pockets, minimum distance etc to be indicated. 9. All valves required for operation and maintenance including process vents and drains, utility connections should be indicated. 10. If seal loops are present, the height should be indicated. 11. All piping spec breaks (change in piping class or material of construction) should be indicated. Generally the line number should be changed after the spec break unless the project philosophy indicates otherwise.


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for P&ID’s

12. Utility required for pump, agitator seals should be indicated in a separate P&ID that gives details of the seal plans. However the process engineer can indicate the seal details and utilities in the process P&ID itself if there is no space constraint. 13. All special piping items should be tagged using prefix SM. Piping will assign tag numbrs during detail engineering. 14. Tracing, jacketing for pipes shall be indicated. 15. Valve positions should be indicated where applicable “NC”, “LO”, “LC”. “NC” shall not be used for vents, drains, control valve bypass. 16. Termination points in a package item shall be referenced within the dotted box indicating package item.

5.3

INSTRUMENTATION

1. Instrumentation should be as per the simplified ISA procedure unless otherwise specified by project philosophy. The signal converters (I/P), transmitters, sensing elements (FE, TE) shall not be tagged. 2. All primary instruments, controllers, alarms, interlocks which are required for process control and operation should be indicated 3. Control valves with block and bypass and failure positions shall be indicated. 4. Local control panels are not indicated for vendor packages. 5. Isolation valves for instrumentation shall be indicated. Typically these are as per the table below unless there are special process requirements:

Type of Instrument

Process connection,

Block valve, mm

mm

NB

15 (2 Nos)

15 (2 Nos)

1.

Orifice flowmeter

2.

Pressure instrument

20

20

3.

Diaphragm seal Pressure Instrument

40

40

4.

Level gauge

25

25


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5.

DP type level Instrument

25

25

6.

Diaphragm seal level Instrument

50

50

7.

Temperature Instrument

40

-

5.4

ELECTRICAL

1. Motors are not shown for pumps, compressors. Motors are shown for agitators, fans for air cooler and cooling tower, motorised valves. 2. Local start / stop push buttons are not indicated in the P&ID’s. 3. Push buttons and switches associated with DCS and Interlock systems should be indicated.

6.

TYPICAL ASSEMBLIES

The following figures give the typical assemblies that should be followed during the preparation of the P&ID’s. The Notes provide explanation regarding the application and additional information to help the process engineer in modifying the standard assembly to suit the project requirement.

6.1

Typical control valve installation

Refer to figure 1 for typical control valve assembly depictions. Following notes are to be read in conjunction with figure 1. 1. Control valves to be provided with block valves to allow the control valve to be removed for maintenance. For control valves above 200 NB, the requirement of block and bypass valve to be decided on a case to case basis. The Block and bypass sizes to be as per Table 2. 2. The bypass line size to be the same as the bypass valve size. 3. The bypass valve to be globe valve (if globe valve is acceptable for the system) upto 200 NB size and same as block valve type beyond 200 NB


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4. All control valves to be provided with 20 NB drain valve with blind flange. Drain valves to be provided upstream and downstream of fail close (FC) valves and upstream of fail open (FO) valves. 5. Reducers/Expanders to be provided within the control valve assembly, immediately adjacent to the valves when block valve sizes are below the line size. 6. Spec break if needed to be provided at the downstream of the 2nd block valve and bypass valve of the control valve assembly. 7. Instrument air-fail position (FO, FC, FL) to be indicated below the control valve.

6.2

Steam trap assembly

Refer to figure 2 for typical steam trap assembly depictions. Following notes are to be read in conjunction with figure 2. 1. Steam trap discharging to be provided with block valves and bypass globe valve. Strainer to be provided if not integral with the trap. 2. Spec break, if required, is to be provided at the downstream of the trap and bypass valve of the steam trap assembly. 3. Downstream block valve need not be provided for traps discharging to atmosphere if two independent outlets are provided. 4. Line traps are provided at the point of entry of steam to equipment such as Vacuum ejectors, heat exchangers. Traps for removal of condensate from steam headers and distribution systems to be indicated by piping department.

6.3

Battery limit conditions

Refer to figure 3 for typical depictions of battery limit conditions. Following notes are to be read in conjunction with figure 3. 1. Isolation valve type to be as per piping requirement.


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2. Spectacle blind shall be provided at the battery limit so that operation and maintenance requirements can be met. 3. Block valve in steam lines shall be provided with warm up bypass valve. The bypass valve shall be a globe valve and shall be installed across the main isolation valve. The size of the warm up bypass valve shall be as per Table 1 4. Two block valves with blind and bleed shall be provided in process services in which contamination cannot be tolerated. Check valve shall be provided to prevent reverse flow in process lines.

6.4

Cooling water header

Refer to figure 4 for typical depictions of cooling water headers. Following notes are to be read in conjunction with figure 4. 1. Jumpover between cooling water supply and return headers to be provided at minimum distance from dead end of headers to facilitate pre-commissioning and start-up activities. The connection shall be one size smaller than the header size.

6.5

Flare header

Refer to figure 5 for typical depictions of flare headers. Following notes are to be read in conjunction with figure 5. 1. The block valve when provided for flare line shall be “Locked Open” type and with the following Note “Flare line isolation valve shall be installed in horizontal line with the stem in downward position to avoid free fall of gate and blockage.” 2. All dead ends of flare header (including sub-headers) to be capped (preferred to flanged ends to prevent leakage) and provided with purge connection of fuel gas or nitrogen. A purge rate of 0.03 m/s (0.1 ft/s) in the header is to be ensured. 3. Following note to be included in P&ID for header


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for P&ID’s

“ All tail pipes to be sloped towards header. All flare lines to join header from top or side of header at 45 deg angle” 4. Indicate slope of 1:500 in flare header upto flare KO pot. 5. If a low temperature relief is expected e.g. liquid LPG relief that can reduce the temperature below ambient, a material spec break is to be provided. Low temp material to be provided at least 6m downstream and upstream of the header at the point of joining.

6.6

Safety valve discharging to atmosphere

Refer to figure 6 for typical depictions of safety valve discharging to atmosphere. Following notes are to be read in conjunction with figure 6. 1. Safety valves in non-hazardous, non-toxic and non-hydrocarbon service can discharge to atmosphere 2. No upstream and downstream isolation is permitted for PSV’s in IBR service. 3. Upstream isolation valves if provided shall be “LO” type and have a note “Isolation valve to be full-bore type” or “FB” indicated against the valve. 4. (Ensure Abbreviation FB is included in the legend diagram) 5. 20NB venting valve shall be provided if isolation valves are provided. 6. Reducers, if required to be provided, based on pressure drop check as per API, shall be placed immediately adjacent to the PSV. The isolation valves shall be line size. 7. The discharge line to have a note “ A 6 mm diameter weep hole for drainage to be provided at low point” 8. Piping spec breaks, if required, shall be provided at the PSV outlet. 9. The inlet line to the PSV shall have “SLOPE” indication in the direction of the equipment being protected and also “NO POCKETS” indication


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for P&ID’s

Thermal relief valve discharging to atmosphere

Refer to figure 7 for typical thermal relief valve (discharging to atmosphere) depictions. Following notes are to be read in conjunction with figure 7. 1. Thermal relief valves in non-hazardous, non-toxic and non-hydrocarbon service can discharge to atmosphere. 2. The relief valve outlet shall be led to grade for discharge of liquid. 3. For cooling water service the PSV size shall be ¾” X 1”.

6.8 ♦

Safety valve discharging to closed system

SINGLE PSV

Refer to figure 8 for typical safety valve discharging to closed system (single PSV) assembly depictions. Following notes are to be read in conjunction with figure 8. 1. Safety valves in hazardous, toxic or hydrocarbon service to discharge to a closed system (either flare or another equipment) 2. Isolation valves, if provided, to be “LO” type and have following note: 3. “Isolation valve to be full-bore type. Valve to be oriented such that valve stem is horizontal”. 4. 20NB depressurising valve to be provided between the isolation valve and the PSV. 5. Reducers, if required to be provided, based on pressure drop check as per API, to be placed immediately adjacent to the PSV. The isolation valves to be line size. 6. The inlet line to the PSV to have “SLOPE” indication in the direction of the equipment being protected and also “NO POCKETS” indication. 7. The discharge line from PSV to have “SLOPE” indication in the direction of draining and also “NO POCKETS” indication. 8. The Piping spec breaks, if required, to be provided at the PSV discharge


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PS.05.03-04 Rev. 00 Page 14 of 38

PSV WITH SPARE

Refer to figure 9 for typical safety valve discharging to closed system (PSV with spare) assembly depictions. All above notes are applicable. In addition 1. If key type interlock is required for the inlet/ discharge isolation valves, this is to be denoted by a dashed line connecting the valves with “INTERLOCK” written along the line.

6.9

Desuperheater

Figure 10 depicts desuperheater assembly. Diagram is self-explanatory and is to be used as such.

6.10 Centrifugal pump installation

Refer to figure 11 for typical depictions of centrifugal pump installation. Following notes are to be read in conjunction with figure 11. 1. Isolation valve type to be as per piping requirement 2. Spectacle blind need not be provided if the fluid handled is non-toxic and non-hazardous. 3. Strainers to be provided at pump suction. -

Y type upto 40NB

-

T type from 50NB to 300 NB

-

Basket type beyond 300 NB.

4. Blinded vent and drain to be provided for Basket type strainer. 5. Reducers if provided in slurry service pumps must include the following note in P&ID “ Eccentric reducer to be installed with flat side at bottom”. If expander is to be provided in pump suction then a straight length of 10D (where D is pump inlet size) shall be provided downstream of the expander. This shall be indicated in the P&ID. 6. Motor is not indicated for pumps. Motor run indication in DCS is shown as XA.


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for P&ID’s

Any start/stop indication from DCS is to be indicated as HS with “STOP” or “START” on top of instrument box. Local start-stop push buttons are not shown. Any interlock to pump trip to be indicated. 7. Pressure gauge to be provided at pump discharge. Requirement of diaphragm seal to be decided based on the fluid properties. 8. Check valve to be provided with 20NB globe valve bypass valve when o

-

Design temperature exceeds 230 C

-

Process fluid is congealing and solidifies at room temperature

-

Process fluid is C4 or lighter (to avoid vaporisation)

6.11 Pump vent/drain

Refer to figures 12 and 13 for typical pump vent/drain assembly depictions. Figure 12 is for general system, while figure 13 is specifically for lights. Following notes are to be read in conjunction with figure 12 and 13. 1. Provide casing drain valve with blind flange for non-hazardous/ non-toxic service. 2. For other fluids, the drain is to be hooked up to a closed drain system. In this case the drain line is provided with double block and spectacle blind. 3. The closed drain system can be -

Closed Blowdown (CBD) for hydrocarbon and sour (containing H2S) service

-

Chemical sewer for chemicals like caustic

4. For C4 and lighter fluids the casing drain is hooked up to the flare. In this case the block valves to be minimum 600mm apart to be able to operate the upstream block valve in case the downstream valve is frozen. 5. Provide a pump vent valve with blind flange for non-hazardous/ non-toxic service. In case the pump is self-venting, the valve is not provided at the pump but the valved vent is provided in the discharge line. 6. The vent line is hooked up to a closed system as for the casing drain. (refer Note 3)


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for P&ID’s

7. When the suction vessel operates at vacuum conditions, the vent line shall be hooked up to the suction vessel. This will allow positive filling of the pump with liquid b efore start up.

6.12 Minimum flow bypass with restriction orifice/control valve

Refer to figure 14 for typical depictions of minimum flow bypass achieved using restriction orifice, while figure 15 represents control valve case. Following notes are to be read in conjunction with figures 14 and 15. 1. Minimum flow bypass is required when the forward pump flow is not always higher than the required minimum flow of selected pump. The RO is sized to provide continuous minimum flow for the pump. 2. For economic reasons a combined flow orifice in the common discharge line of the pump and spare pump can be considered. The disadvantage is the pumps are not protected against the inadvertent closure of the discharge valve. 3. Minimum flow control using an automatic control valve is preferred for high capacity and high pressure systems. The control valve is “FO” type so that the pump is protected in case of Instrument air failure. 4. For economic reasons a combined flow control valve in the common discharge line of the pump and spare pump can be considered. The disadvantage is the pumps are not protected against the inadvertent closure of the individual pump isolation valve.

6.13 Typical positive displacement pump installation

Refer to figure 16 for typical depictions of positive displacement pump installations. Following notes are to be read in conjunction with figure 16. 1. Isolation valve type to be as per piping requirement 2. Spectacle blind need not be provided if the fluid handled is non-toxic and non-hazardous. 3. Strainers to be provided at pump suction. -

Y type upto 40NB


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-

T type from 50NB to 300NB

-

Basket type beyond 300 NB .

4. Blinded vent and drain to be provided for Basket type strainer. 5. Suction pulsation bottle or dampener is supplied by the pump vendor. The pump vendor also decides the requirement of the dampeners. The dampener is tagged (F) to indicate that it is vendor furnished. Dampeners shall be provided with vent and drain connections 6. Discharge pulsation bottle or dampener is supplied by the pump vendor. The pump vendor also decides the requirement of the dampeners. The dampener is tagged (F) to indicate that it is vendor furnished. Dampeners shall be provided with vent and drain connections 7. Motor is not indicated for pumps. Motor run indication in DCS is shown as XA. Any start/stop indication from DCS is to be indicated as HS with “STOP” or “START” on top of instrument box. Local start-stop push buttons are not shown. Any interlock to pump trip to be indicated. 8. Pressure gauge to be provided at pump discharge. Since the pump discharge flow is pulsating, the PI should be provided with a dampener. 9. The pump suction and discharge line shall be provided with a drain valve. The drain connection in the pulsation bottles can be blinded if complete drainage via the pump line drains is possible. 10. In case of hazardous or toxic service the drains shall be hooked up to a closed drain system. In this case the drain line is provided with double block and spectacle blind. 11. The closed drain system can be -

Closed Blowdown (CBD) for hydrocarbon and sour (containing H2S) service

-

Chemical sewer for chemicals like caustic

12. A safety valve shall be installed at the pump discharge. Even if the pump vendor supplies an in built safety valve, an external safety valve must be provided because of the reliability of the in built safety valve. The safety valve is normally connected to the pump suction line. If it is recommended to connect the safety valve to the suction vessel, a “Locked Open” valve shall be provided.


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13. Normally check valve is not provided in the pump discharge because of the pump configuration. 14. If the PD pump is to be used for metering, a calibration pot shall be provided at the pump suction. The pump vendor shall supply the calibration pot.

6.14 Positive displacement pump capacity control

Refer to figure 17 for typical depictions of positive displacement pump capacity control. Following notes are to be read in conjunction with figure 17. 1. Since the PD pump volumetric capacity if fixed, in case of varying process flow, the excess flow is returned to the suction vessel. The control is based on maintaining the desired pressure at the user point. PIC to be located at user location. 2. The return line is tapped close to the user point for better controllability. 3. The control valve is sized for full pump flow and is “FO” type. 4. A self-actuated pressure-regulating valve may be used instead of the control valve assembly if the duty is not critical. 5. Capacity control can also be achieved by adjusting the stroke length of the pump.

6.15 Atmospheric storage tank venting arrangement

Refer to figure 18 for typical depictions of atmospheric storage tank venting arrangement. Following notes are to be read in conjunction with figure 18. 1. Vent with gooseneck, check need for flame arrestor based on flash point of material stored. 2. Manhole with emergency vent for hydrocarbon storage.


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for P&ID’s

6.16 Blanketed tanks

Refer to figures 19 and 20 for typical depictions of blanketed tanks. Figure 19 refers to pressure controller version and figure 20 is for self actuated PCV case. Following notes are to be read in conjunction with figures 19 and 20. 1. Blanketing arrangement with split range PIC controller is used when instrument air is available in the offsite area. 2. Self-actuated PCV’s do not need instrument air. The 3 PCV’s come as an assembly. 3. Pressure-Vacuum relief breather valve to be provided. 4. Manhole with emergency vent for hydrocarbon storage.

6.17 Tank heating arrangement

Refer to figure 21 and 22 for typical depictions of tank heating arrangement. Figure 21 is for manual control case, while figure 22 depicts automatic control operation. Following notes are to be read in conjunction with figures 21 and 22. 1. Manual control of heating steam to coil if the duty is not very critical. Manual control by globe valve in steam line. 2. Local temperature indication to be in visible from globe valve for ease of control. 3. If non-IBR (less than 3.5kg/cm2g design pressure) is used for tank heating no spec break is required to be indicated. If higher pressure steam is used and condensate is drained to atmosphere, spec break to be indicated downstream of globe valve. 4. Standard steam trap assembly draining to grade to be provided in case of no condensate recovery. 5. When control of temperature of tank contents is required, control valve assembly to be provided to regulate steam flow into the tank coil. 6. Standard steam trap assembly draining to grade or to condensate header to be provided based on condensate recovery philosophy.


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for P&ID’s

6.18 Typical floating roof tank installation

Refer to figure 23 for typical depictions of floating roof tank installation. Following notes are to be read in conjunction with figure 23. 1. For flammable liquid, foam supply line to be provided around the tank & the foam supply line shall form ring around the tank. The line size & the scope of supply of this are included in vendor’s scope. 2. Floating roof tank shall have rim vent and breather valve. For flammable liquids all PVRV shall have flame arrestor. Vendor shall decide the size & number of rim vents. 3. Tank shall be located in dyke wall. 4. Double deck type tank shall have pontoon manhole. The number of manhole & the size shall be decided by vendor / mechanical. 5. Clean out door (rectangular type) shall be provided on shell. 6. All the nozzles on shell body of the tank except LSH nozzle shall be provided at a minimum distance from bottom. 7. Tank shall be provided with level transmitter for measurement of low level. Low low level alarm shall be configured in level transmitter. Tank outlet valves shall close & tank outlet pump shall trip on activation of low low-level alarm. 8. Size of Roof drain nozzle to be decided by vendor. 9. Bleeder vent shall be used for out-breathing of air during initial filling & in-breathing of air during tank draining. Tank isolation valves shall correspond to piping specification of the given project. 10. Portable pump shall be provided for complete draining of tank. 11. Auto tank gauging system (ATG) shall be considered for floating roof tanks. This system consists of measuring the level in the tank based on change in the ambient temperature of the product stored. For this purpose the density transmitter shall be provided on shell at a minimum level from bottom. Separate temperature element nozzle shall be provided on roof of the tank with a dip pipe. Temperature & density transmitter signal shall be coupled with level transmitter provide on roof. Output from level transmitter shall be taken to three places


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for P&ID’s

•

Local indicator shall be provided at grade level outside the dyke wall.

•

Indication in DCS.

•

Indication on ATG panel provided in DCS separately.

ATG local indicators shall be mounted at the grade level outside the dyke wall. 12. Unexpected liquid movement alarm shall be configured in ATG. 13. Temperature indicator nozzle shall be provided with 4” steel well. 14. Radar type level indicator & level dip hatch shall be provided with 8” steel well. 15. Tank shall be provided with separate high high level switch. Tank inlet pumps shall tr 16. During roof drain choking, if liquid level on roof rises beyond the design capacity, the roof may sink. To avoid such incidence an emergency drain is provided. In that case the rise in level beyond the design capacity on roof cause the liquid to enter in the tank.

6.19 Truck loading arm

Refer to figure 24 for typical depictions of truck loading arms. Following notes are to be read in conjunction with figure 24. 1. Overfill protection switch shall be provided on loading arm to avoid overfilling of truck while loading the liquid. FCV provided at the upstream of loading arm shall close on activation of this switch. 2. Provide funnel for collecting the loading arm drip. 3. Indicate the bay number. 4. Unloading hose with blind flange shall be provided in each bay to unload sick tanker. Unloading hose length shall be 3 meter. Elevation of unloading line shall be 450 mm. 5. Parking switch shall be provided on loading arm to avoid opening of FCV provided at the upstream of loading arm when loading arm is in parking position. 6. Drop down access platform shall be provided in loading bay & earth straps shall be provided in case of flammable liquid.



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for P&ID’s

PS.05.03-04 Rev. 00 Page 22 of 38

Figure 1: Typical control valve installation

FV

FO 20

FV

FC 20

20

Figure 2: Steam trap assembly

CONDENSATE HEADER T 20

20 IH

IP T

TO DRAIN AT GRADE

IH IP 20

T

TO DRAIN AT GRADE


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Figure 3: Battery limit installation

FROM B/L

NOTE 1,2 TO PROCESS PLANT 20

NOTE 3

FROM B/L

NOTE 1,2

NOTE 4 TO PROCESS PLANT 20


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Figure 4: Cooling water header

CWS

MIN.

NOTE 1,2

20

USERS NOTE 5 CWR

NOTE 1,2

MIN. 20


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Figure 5: Flare header

NOTE 8,9

NOTE 1,2

FROM B/L

LO 6M MIN.

NOTE 7 XXX RO

YYY

LOW TEMP SPEC.

NOTE 6

50 UC

NOTE 10

NITROGEN / FUEL GAS



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Figure 6: Safety valve discharging to atmosphere

XXX

YYY

PSV

S T E K C O P O N E P O L S



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Figure 7: Thermal relief valve discharging to atmosphere

PSV

Figure 8Single PSV discharging to closed system

XXX

YYY

PSV


PS.05.03-04 Rev. 00


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for P&ID’s

Figure 9: PSV with spare discharging to closed system

K C O L R E T N I

S T E K C O P O N

S T E K C O P O N

E P O L S

E P O L S

Figure 10: Desuperheater

BFW

20

20

H TIC

PI L

STEAM

10D STRAIGHT LENGTH 10D MIN.



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Figure 11: Typical centrifugal pump installation

NOTE 2

NOTE 8

PI

NOTE 7

I

NOTE 2 NOTE 5

XA

NOTE 6 NOTE 1

NOTE 3

STOP

P-101

HS

NOTE 4

NOTE 4

Figure 12: Pump vent/drain

ALTERNATE VENT

NOTE 5 IH

IF PROCESS IS HOT INSULATED

IS

NOTE 2

20

NOTE 1 20

20

PROCESS SPEC

CLOSED DRAIN SYSTEM NOTE 3



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Figure 13: Pump vent/drain (lights)

NOTE 7

25

NOTE 4

25 M M 0 0 6

20

PROCESS SPEC

E R A L F


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Figure 14: Minimum flow bypass with restriction orifice

TO SUCTION VESSEL

RO

NOTE 1

TO SUCTION VESSEL

RO

NOTE 2


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Figure 15: Minimum flow bypass with control valve

TO SUCTION VESSEL

NOTE 3

FO

FIC L

TO SUCTION VESSEL

FO

FIC L

FORWARD FLOW TO PROCESS



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Figure 16: Typical positive displacement pump installation

NOTE 1 PSV

NOTE 2

NOTE 12 LO NOTE 12

(F)

NOTE 14

V

V (F)

(F) NOTE 5

NOTE 8

NOTE 6

PI

NOTE 2

NOTE 1

NOTE 3

20

20

NOTE 9,10,11

NOTE 9,10,11 I

STOP HS

XA

NOTE 7

Figure 17: Positive displacement pump capacity control

FO

PIC

N OT E 2 N OT E 1


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Figure 18: Atsmopheric storage tank venting arrangement

PSV

Figure 19: Blanketed tanks (pressure controller)

SPLIT RANGE

PIC

U TI LIT Y SPEC INERT

PR OC ESS SPEC FREE DRAIN

FLARE OR ATM

FREE DRAIN

FC

FO

NOTE 1 PVRV PSV

VAC NOTE 3

PROCESS SPEC

PRESS NOTE 4



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Figure 20: Blanketed tanks (self actuated PCV)

PCV

FUEL GAS/ NAT GAS

NOTE 2

PVRV PCV

PCV

NOTE 3 PSV

NOTE 4

Figure 21: Tank heating (manual control)

NOTE 2 IN VIEW PI

STEAM

TI

NOTE 1 IBR NOTE 3

NON-IBR T

GRADE


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Figure 22: Tank heating (automatic control)

TIC

STEAM FC 20

20

T

CONDENSATE


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Figure 23: Typical floating roof tank installation


Typical Systems Depiction for PIDs

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