BES-CO-05-003 Piping Flushing and Pressure Testing

Piping Fl Flushing & Pr Pressure Te Testing

BES-CO-05-003-02 Rev: 2 / 02.10.2008

Issuing organisation PA&E

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PIPING FLUSHING AND PRESSURE TESTING BES-CO-05-003

Preparer

Date 02.10.2008

Issuer

Date 02.10.2008

Process owner

2

General update

1

Approved

Name/Position Gino De Landtsheer / Piping Expert TSG - PTS Name/Position Hennie de Bruyn / Chief Engineer – Material Technology, PTS

Date

Name/Position

02.10.2008

Jan-Olav Kvitnes/ Specs PTS

Rev. Descri scrip ptio tion

A print of this document is only valid at the date of printing. For reference, use the actual version available on Borena/Bordocs.

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TABLE OF CONTENTS 1 GENERAL........... ....................... ....................... ....................... ........................ ....................... ....................... ........................ ........................ ....................... ....................... ................ .... 4 1.1 Validity........... ....................... ....................... ....................... ........................ ....................... ....................... ........................ ....................... ....................... ........................ ................... ....... 4 1.2 Review Schedule.......... ...................... ........................ ........................ ....................... ....................... ........................ ....................... ....................... ........................ ............... ... 4 1.3 Group Amendment Amendment to the Borealis Borealis Engineering Engineering Specification Specification............ ....................... .................. ............ ......... ......... .......... ....... ..4 4 1.4 Objective and Scope.......... ...................... ........................ ....................... ....................... ........................ ........................ ...................... ............... .......... .......... .......... ....... .. 4 2 APPLIED STANDARD STANDARDS S.......... ...................... ........................ ....................... ....................... ........................ ........................ .................... ............. .......... .......... .......... ...... 4. 2.1 Standards and Regulation Regulations s........... ....................... ........................ ....................... ....................... ........................ ........................ ................. .......... .......... .......... ......4. 2.1.1 European Directives........... ....................... ........................ ....................... ....................... ........................ ....................... ....................... .................. ........... .......... ....... .. 5 2.1.2 Applicabl Applicable e Design Codes.......... ...................... ........................ ........................ ....................... ....................... ..................... .............. .......... .......... .......... .......... .....5 2.1.3 Borealis Reference Documents............ ........................ ........................ ....................... ....................... ........................ ....................... ................ .......... ....... ..5 2.1.4 Standards........... ...................... ....................... ........................ ....................... ....................... ........................ ....................... ....................... ........................ .................. ........... ..... 5 3 QUALITY ASSURAN ASSURANCE CE / QUALITY CONTROL.......... ...................... ........................ ....................... ....................... ..................... .............. ....... ..5 3.1 Quality Assurance Assurance / Quality Quality Control Control........... ........................ ......................... ........................ ......................... ......................... .............................. ..................5 3.1.1 Inspection Plan............ ....................... ....................... ........................ ....................... ....................... ........................ ....................... ....................... ..................... .............. ..... 5 3.1.2 Inspection Notification.......... ...................... ........................ ....................... ....................... ........................ ........................ .................. ........... .......... .......... .......... ...... 6. 3.1.3 Inspector’s Approval Approval........... ....................... ......................... ......................... ........................ ........................ ......................... ......................... .......................... .............. 6 3.2 Documentatio Documentation n........... ....................... ........................ ....................... ....................... ........................ ....................... ....................... ....................... ................ .......... .......... ........ ... 6 3.2.1 Quality records............ ....................... ....................... ........................ ........................ ....................... ....................... ........................ .................... ............. .......... .......... ....... .. 6 3.2.2 Filing System........... ....................... ....................... ....................... ........................ ........................ ....................... ....................... ........................ ....................... ................ ...... 7. 4 BASIC DESIGN REQUIREMEN REQUIREMENTS TS........... ....................... ........................ ....................... ....................... ........................ ....................... .................... ............. ....7 4.1 General............ General......................... ......................... ........................ ......................... ......................... ........................ ........................ ............................................... ................................... 7 5 FLUSHING REQUIREMEN REQUIREMENTS TS.......... ...................... ........................ ....................... ....................... ........................ ....................... ................ .......... .......... .......... ...... 7. 5.1 General............ General......................... ......................... ........................ ......................... ......................... ........................ ........................ ............................................... ................................... 7 5.2 Hydro Flushing........... ....................... ........................ ....................... ....................... ........................ ....................... ....................... ....................... ................ .......... .......... ........ ... 8 5.3 Pressurised Air Shock Blowing (PAS)........... ....................... ....................... ....................... ........................ ..................... .............. .......... .......... .......... .....9 5.4 Pneumatic Flushing........... ...................... ....................... ........................ ....................... ....................... ........................ ........................ ....................... ................. .......... ..... 9. 5.5 Hot Oil Flushing............ ........................ ....................... ....................... ........................ ....................... ....................... ........................ ........................ ...................... ............... ..... 9 5.5.1 General............ General......................... ......................... ........................ ........................ ......................... ......................... ........................ ........................................... ...............................9. 5.5.2 Marking........... ...................... ....................... ........................ ........................ ....................... ....................... ........................ ..................... .............. .......... .......... .......... .......... ...... 10 . 5.5.3 Documentatio Documentation n............ ....................... ....................... ........................ ........................ ....................... ....................... ........................ .................. ........... .......... .......... ....... .. 10 6 PRESSURE TESTING........... ....................... ........................ ....................... ....................... ........................ ....................... ....................... .................. ........... .......... ....... .. 10 6.1 General............ General......................... ......................... ........................ ......................... ......................... ........................ ........................ ............................................. ................................. 10 6.1.1 Pressure Test Diagrams Diagrams and and Test Procedure............ ........................ ........................ ....................... ....................... ...................... ............ ..10 10 6.1.2 Pressure Test Packages........... ....................... ........................ ........................ ....................... ....................... .................... ............. ......... ......... .......... .......... .....10 6.1.3 Test Pressure........... ....................... ....................... ....................... ........................ ........................ ....................... ....................... ........................ ................. .......... ......... .... 11 6.2 Preparations for Testing........... ....................... ........................ ....................... ....................... ........................ ....................... .................... .............. .......... .......... ...... 11 . 6.3 Safety and Environmental Control Control............ ........................ ........................ ......................... ......................... ........................ .............................. ..................13 6.4 Test Equipment Equipment........... ....................... ........................ ......................... ......................... ........................ ......................... ......................... .................................. ...................... 14 6.5 Test Medium........... ....................... ....................... ....................... ........................ ....................... ....................... ........................ ................. .......... .......... .......... .......... .......... ..... 14 6.5.1 For Hydrostatic Testing............ ........................ ....................... ....................... ........................ ....................... ..................... ............... .......... .......... .......... ......... ....14 6.5.2 Austentic Stainless Steel Steel........... ........................ ......................... ........................ ......................... ......................... ........................ ............................. .................15 6.5.3 Ferritic Stainless Stainless Steels Steels and Medium/High Medium/High Nickel Alloys Alloys.......... ...................... ........................ .................. ........... .......... ......... ....15 15 6.5.4 Duplex Stainless Steel Steel............. ......................... ........................ ......................... ......................... ....................................................... ...........................................15 6.5.5 9% Nickel Alloy Steel Steel............. ......................... ........................ ......................... ......................... ........................ ...................................... .......................... ....... 16 6.5.6 Aluminiu Aluminium m and and Aluminiu Aluminium m Alloys Alloys............ ........................ ....................... ....................... ........................ ........................ ....................... ................... ........16 16 6.5.7 For Pneumatic Testing........... ....................... ........................ ....................... ....................... ........................ ...................... ............... .......... .......... .......... .......... .....16 6.5.8 For Alternative Leak Test and for Service Test Test........... ........................ ......................... ........................ ......................... ..................... ........16 16 6.6 Disposal............ Disposal........................ ........................ ......................... ......................... ........................ ......................... ......................... ............................................ ................................ 16 6.7 Test Procedure........... ....................... ....................... ....................... ........................ ........................ ....................... ....................... ........................ ...................... ............... ..... 16 6.7.1 Hydrostatic Testing........... ....................... ........................ ........................ ....................... ....................... ........................ ....................... ....................... .................. ......16 6.7.2 Pneumatic Testing.......... ...................... ........................ ........................ ....................... ....................... ........................ ....................... ....................... ................... ........ 17 . 6.7.3 Alternative to Hydrostatic Hydrostatic or Pneumatic Pressure Testing Testing (Alternative Leak Test)..... ......... ....... ...... ...19 19 6.7.4 Initial Service Leak Test (Service Test)........... ....................... ....................... ....................... ...................... ............... .......... .......... .......... ......... ....19 19


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6.7.5 Draining and Drying..............................................................................................................19 6.7.6 Verification of Cleanliness....................................................................................................20 6.7.7 Reinstatement...................................................................................................................... 20 7 CHEMICAL CLEANING.............................................................................................................21 8 INSPECTION AND REPORTING.............................................................................................22 9 ATTACHMENTS........................................................................................................................ 22


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1

GENERAL

1.1

Validity This specification is valid for all BOREALIS Sites.

1.2

Review Schedule This specification shall be reviewed at least every three years.

1.3

Group Amendment to the Borealis Engineering Specification This Borealis Engineering Specification shall consist of the ‘BES-CO-00-001; Group Amendment to the Borealis Engineering Specifications’ which are incorporated herein and made part here of by reference. Content for info: General Definitions, Abbreviations, Objective and Scope, Language, Unit System, CE-Marking, PED / ATEX / Quality Assurance / Quality Control, General Basic Design Requirements.

1.4

Objective and Scope It is CONTRACTOR’s responsibility, after the piping lay-out is completely installed and before it will be put in to operation, to perform a full flushing (blow out) of the piping lay-out and/or applicable equipment. This is to allow removal any loose debris. Only after this action a pressure test can be performed. A final purging phase with a temporary gas (nitrogen) or with the intended system gas needs to be performed to assure cleanliness of the piping components. When any requirement in this specification might violate specific requirements of a material VENDOR necessary to warrant the integrity of supplied materials, the different requirements must be discussed and approved by COMPANY.

2

APPLIED STANDARDS It shall be CONTRACTOR’s responsibility to be, or to become, knowledgeable of the requirements of the referenced Codes and Standards. When an edition date is not indicated for a code or standard, the latest edition in force at the time of CONTRACTOR’s commitment shall apply. Intermediate changes or updates/revisions of applied codes, standards, regulations or laws during the course of the project shall be brought to COMPANY’s attention. Possible implications for the works shall be discussed.

2.1

Standards and Regulations The design and engineering shall satisfy all laws and regulations of the national and/or local authorities of the country in which the EQUIPMENT AND MATERIALS will be located. The international codes and standards, to the extent specified herein, form a part of this specification and shall be followed. Some codes or standards (e.g. Euro codes) are still under development and their final number and identification are given below. If the referenced code is not yet available, it’s preceding pre-code, draft code or relevant national codes covering the same subject shall be followed. In case of conflict, the order of precedence shall be:


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National and/or local Laws and Regulations applicable at the location of the site.

2. 3.

European Directives Applicable Design Codes (ASME BVPC, ASME B31.3, AD2000, BS 5500, EN 13445, EN 13480, etc.) 4. Project specific CATALOGUE DATA SHEETS from the LICENSOR 5. COMPANY specifications Project Specification Local Amendment Common Engineering Specification Reference to international standards (API, NFPA, etc.) • • •

The more stringent of two conflicting regulations/standards will prevail. In all cases CONTRACTOR shall inform COMPANY of any deviation from the requirements in the specifications, which is considered to be necessary in order to comply with national and/or local laws and regulations. Deviations from this specification are subject to written approval by COMPANY. After this approval these specifications are integral part of the contract. The standards and codes as listed in 2.1.1, 2.1.2, 2.1.3 and 2.1.4 shall be followed. 2.1.1

European Directives 97/23 EC

Pressure Equipment Directive (PED) for pressure containing equipment and assemblies

2.1.2

Applicable Design Codes ASME B31.3 Code for Pressure Piping: Process Piping AD2000 Code Technical Rules for Pressure Vessels: AD Merkblätter, AD2000 Merkblatt HP 100 R EN 13480 Metallic Industrial Piping

2.1.3

Borealis Reference Documents BER-CO-05-001 General Design Requirements Piping BES-CO-00-001 Group Amendment to the Borealis Engineering Specifications BES-CO-04-013 Mechanical Package Unit General

2.1.4

Standards ISO 4406 ISBN 0717616290

Hydraulic Fluid Power - Fluids – Method for Coding the Level of Contamination by Solid Particles Health Safety & Environment (HSE) Guidance note GS4 Safety in Pressure Testing

3

QUALITY ASSURANCE / QUALITY CONTROL

3.1

Quality Assurance / Quality Control

3.1.1 Inspection Plan CONTRACTOR shall establish and maintain a documented inspection plan that will provide adequate, effective Quality Assurance and will provide for the easy identification and handling of items.


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The flushing activities and the specific pressure test inspections described in this specification shall be part of the general quality inspection plan related to any piping fabrication and/or assembly activities. Each applicable quality inspection plan shall be set up as per recommended project requirements and in relation with the fabrication sequence. Inspection points related to the flushing and testing of piping components, piping spools and piping assemblies, shall be part of the general project inspection plan that shall be sent to COMPANY for approval prior to contract awarding. Together with the general project inspection plan, all applicable procedures concerning flushing and testing of piping components, piping spools and piping assemblies shall be sent to COMPANY for approval prior to contract awarding. 3.1.2

Inspection Notification CONTRACTOR shall provide COMPANY with advance notification of certain shop inspections and tests (when applicable or required according inspection plans); field inspection and tests, including those of SUBCONTRACTORS and/or SUBVENDORS, as outlined in the contract or agreements made in the pre-award inspection meeting. COMPANY shall be informed in advance according to the schedule specified in the project planning or at least 10 working days before the actual scheduled date. COMPANY shall have entry - after advance notification - to all CONTRACTOR and SUBCONTRACTOR’S plants where testing of equipment and/or materials is in progress. It shall be the responsibility of CONTRACTOR to notify SUBCONTRACTORS, SUBVENDORS, THIRD PARTY INSPECTORS or NOTIFIED BODIES (in case CE certification is applicable) of COMPANY’s inspection requirements.

3.1.3

Inspector’s Approval COMPANY inspector’s approval does not relieve CONTRACTOR from any responsibility.

3.2

Documentation

3.2.1

Quality records Quality records shall include, but are not limited to: Item identification by reference to drawings and revision number Operating, design and test conditions by reference to piping lay-out drawings (isometrics) and revision number Approved flushing procedure specifications Approved pressure test procedure specifications Acceptance criteria by reference to procedures Specific inspections performed and results obtained Date of inspections and identification of inspection Data recording charts, checked and signed after 100% completion of the applicable test by a representative of CONTRACTOR, SUBCONTRACTORS, SUBVENDORS, THIRD PARTY INSPECTORS or NOTIFIED BODIES (in case CE certification is applicable) and the COMPANY’S inspector. (COMPANY’S inspector has the possibility to waive this inspection) Qualification of material, personnel, procedures and equipment. Callibration reports of all used inspection equipment used. This is required for the performance of the quality review. • •

• • • • • •

• •


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COMPANY final inspection certificate

If deemed necessary by COMPANY inspector, other items may be added. CONTRACTOR may use its own forms for records but this must be submitted to COMPANY for approval prior to use. All previously mentioned data shall be available to COMPANY's representative at all times and the status of the data content shall be completed together with the assembly progress. An example of the traceability in relation to pressure testing shall be supplied by CONTRACTOR together with the quality plan to COMPANY for approval prior to use. The quality of flushing and the internal cleanliness of the piping spools shall be checked on a spot check basis by a COMPANY representative. Any indication that COMPANY requirements are not fulfilled will result in extra inspections. CONTRACTOR will cooperate without any extra costs to allow COMPANY’S inspector to perform the extra inspections. All hardcopy documents shall be of good copy quality, allowing a well readable content with no possibility of wrong interpretation. If dates of validity are applicable (e.g. calibration test certificates, etc.), these shall be clearly indicated and checked. If documents are delivered with expired dates of validity, this will result in a rejection of the final documentation. All documentation shall be provided to COMPANY in ‘As Built’ version and 100% complete. This final and ‘As Built’ data shall be send by the CONTRACTOR to the COMPANY both in hardcopy and scanned format (*.pdf) and compiled on CD-rom. 3.2.2 Filing System CONTRACTOR shall maintain a systematic filing system of all certificates and reports for all tests and inspections carried out by him under the applicable specifications, standards and codes of practice quoted herein. Originals of all documents are to be sent to COMPANY.

4

BASIC DESIGN REQUIREMENTS

4.1

General Complete package units delivered by other VENDORS shall not be flushed and pressure tested unless separately requested by COMPANY, since this has already been performed during fabrication in VENDOR’s shop. Flushing and pressure testing of packaged units shall be in accordance to the requirements outlined in ‘BES-CO-04-013 Mechanical Package Unit General, Section 6 Inspection and Testing’. Although some test systems may be tested in combination with systems installed by other CONTRACTORS, each CONTRACTOR is responsible for his own part installed, unless agreed otherwise.

5

FLUSHING REQUIREMENTS

5.1 General Procedures for flushing shall be developed by CONTRACTOR prior to start and subjected to the approval by COMPANY. A print of this document is only valid at the date of printing. For reference, use the actual version available on Borena/Bordocs.

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After COMPANY accepted the preparations for flushing, the piping system will be released for flushing. The initial flushing shall be carried out prior to pressure testing. For austenitic steelwork, flushing can be performed after pressure testing, if approved by COMPANY. General requirements for flushing for specific systems are listed in Attachment 1; Fluid List. All pipe work shall be free from dirt, trash, debris, grease and temporary protective coating upon completion of flushing. Flushing through equipment is not allowed unless approved by COMPANY. During flushing of pump suction/discharge lines, the pipe connections to the pump shall be turned away and the pump inlet shall be adequately covered to prevent contamination of pumps. This applies also for equipment nozzles, which shall be blinded off, during the flushing operation. To clean the inside of storage tanks water jetting can be applied. Flushing shall be performed against open pipe ends, not via small openings like vents, drains, etc. The system shall be inspected for cleanliness and approved by COMPANY before closing and reinstatement. Before closing and reinstatement after the flushing and pressure test activities, the flange faces of each dismantled flange connection shall be inspected for damage. Any damage will result in a re-machining of the flange face to meet the required facing tolerances. 5.2

Hydro Flushing Items of equipment, which would be sensitive to damage during hydro flushing, shall be removed, blocked off or isolated. A list shall be prepared and be part of t he flush & test procedure. Ball valves shall be flushed in fully open position. All piping systems shall be flushed using high-pressure jet flushing equipment, such as rotating hose or rotating nozzle. Minimum pressure shall be 600 bar(g). Below 4”, High Velocity Water Flushing (HVWF) may be used. Water velocity shall be a minimum of 10m/s. On systems where high pressure jet flushing cannot be used due to complicated shapes and/or long runs HVWF may be used. The flushing medium shall in general be fresh water.


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All flushing and hydro testing for carbon-steel and stainless steel systems shall be performed with clean water (maximum chloride content 100 ppm). Prior to use, the water shall be analysed and the results reported to COMPANY. After flushing, the piping systems shall be completely drained and protected against corrosion, as specified in ‘Attachment 1 Fluid List’. Also see Section 6.5.2; Austenitic Stainless Steel. 5.3 Pressurised Air Shock Blowing (PAS) This method may be used as an initial cleaning method for instrument air, plant air and as an alternative method for initial cleaning of small-bore pipe (less than 2 inch). This method may also be used when there are problems removing trapped liquid in the circuit, or to verify cleanliness of small-bore pipe where video inspection is impossible or inadequate due to pipe dimension or configuration. When using PAS method for cleaning or verification, the procedure shall be repeated until cleanliness is acceptable to COMPANY. The air shocking pressure shall never exceed the working pressure of the system and shall never be more than 8 bar(g). Special safety precautions shall be agreed with COMPANY when this method is used. 5.4 Pneumatic Flushing In cases where water is not desirable in the piping system (e.g. instrument/utility air, nitrogen), flushing by pressurised air or PAS shall be carried out. When pressurised air is used, the minimum velocity shall be 35m/s. Procedure to limit the safety risk for personnel, equipment and environment shall be established by CONTRACTOR and approved by COMPANY. 5.5

Hot Oil Flushing

5.5.1 General Required cleanliness for systems subject to hot oil flushing shall be in accordance with Attachment 1; Fluid List. A detailed procedure for hot oil flushing shall be developed out prior to start. Filters used for hot oil flushing shall be: 10 µm ABS for hydraulic systems 10 – 25 µm ABS for lube and seal oil • •

Filling of lubricant oil shall take place through filters with 10µm ABS. Flushing and sampling to verify cleanness shall take place at turbulent flow, upstream any filters. The Reynolds number shall be minimum 4000.


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The level of cleanness shall be documented from an automatic particle counter or a membrane checked in a microscope before a flushing operation is considered finalised. A flow meter shall be installed to verify flow used during flushing operation. Maximum water content in oil used for flushing shall be less than 500ppm. 5.5.2 Marking Piping spools or systems that have been chemical cleaned or hot oil flushed shall be marked in a unique manner. 5.5.3 Documentation Relevant laboratory analysis certificates or other acceptable methods shall document the compliance to ISO 4406 requirements.

6

PRESSURE TESTING

6.1

General

6.1.1

Pressure Test Diagrams and Test Procedure CONTRACTOR shall prepare Pressure Test Diagrams and Test Procedure. Piping systems subject to pressure testing shall be indicated on Pressure Test diagrams that are prepared using P&ID´s.

Prior to testing CONTRACTOR shall obtain approval by COMPANY for: •

•

Pressure testing-plan outlining lines to be Hydro-tested o Pneumatically tested o Alternative Leak tested o Initial Service Leak tested o Pressure testing procedure

6.1.2 Pressure Test Packages Based on the approved testing procedure, CONTRACTOR will prepare Pressure Test Packages. These packages shall include, but not limited to: •

•

•

•

•

Review of P&ID to define test packages limits, equipment and instrument to be included or excluded, the valve position (open / close) and test blinds Check of systems to assure that the maximum allowable test pressure of the weakest point in the system is not exceeded. Check of systems applicable to hydro test for static load of the applied test medium to ensure that the maximum allowable test load of the weakest point in the system is not exceeded. Colour-code of piping system to be tested, outlined in the P&ID, and assigned test system numbers for identification Assembled pressure test packages: The package shall consist of Piping Pressure Test Record and Isometric drawings with test related information (blinds, valve tested open or closed, removed instruments etc.)


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6.1.3 Test Pressure The test pressure shall be accordance with the requirements of the Pressure Equipment Directive (97/23 EC), as well as the applicable piping design code. Reference is also made to Attachment 2; Pressure Test – Static Head of Test Medium. 6.2

Preparations for Testing Before the pressure test, CONTRACTOR shall: • •

•

• •

• •

•

• •

•

• •

• • • •

• • •

•

Perform a visual inspection of the piping (internal and external). Inspect piping for completeness and conformity to piping drawings (including P&ID ´s) and specifications (use punch-list). Verify that flushing has been performed as required. The inside of all pipe work shall be clean and free from loose mill scale, weld spatters and any other foreign matter. Verify that all NDT, PWHT, etc. has been completed, documented and approved. Verify that the Pressure Test Diagrams and the Pressure Test Packages are up-todate and are approved by COMPANY. Verify that the test pressure is in accordance with the codes and specifications. Verify the quality of the test medium, the testing temperature and whether a corrosion inhibitor has been added as per product datasheets. The type of corrosion inhibitor and preparation of the test fluid shall be approved by COMPANY. Verify that all testing equipment is in accordance with the specifications, calibrated etc. Verify the location of the test pressure gauges. Before pressure testing, all open butt-weld ends on process piping shall be closed with metal plates, welded into or onto the pipe (thickness and weld size to withstand applied pressure). Before pressure testing, all open flanged ends shall be closed with blind flanges in corresponding sizes and the pressure ratings. The blind flanges shall have sufficient thickness to allow pressure testing without any deformation. Temporary gaskets shall be used for hydrostatic pressure testing. All joints shall be left un-insulated and unlined and exposed for examination during pressure testing, except that joints and tubes previously tested in accordance with this specification may be insulated or covered. Painting for corrosion protection is permitted, provided, it does not prevent the clear examination of the joint under test. Verify the location and installation of blinds. Verify that all items which cannot sustain the pressure test are removed. Verify that spring hangers/supports are blocked where required. Verify that supporting structures and piping can sustain the load of the test medium. Verify that all safety precautions are taken and known to all personnel. Verify that all air is displaced from the pipe work before applying the test pressure. Pipe work under test conditions shall not be subject to any form of shock loading (e.g. hammer testing). The full test pressure value shall be maintained for at least 1 hour.

After the pressure test, CONTRACTOR shall: • •

•

Verify that there is no deterioration resulting from the pressure test. Immediately after hydrostatic test, pipe spools shall be dried out by dry, oil free air or nitrogen. CONTRACTOR shall take all precautions to ensure that piping cleanliness is maintained. No modification to the piping shall be allowed after previously mentioned test.


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If the pressure test has negative results (leakage), CONTRACTOR shall repair the system and Pressure Test the system again. Verify that all testing equipment is removed. Verify that all items, which where removed prior to the pressure test, are reinstalled. Special attention shall be paid to t he connections. Installation of final gaskets as per piping classes. Assemble all documents concerning NDT, Pressure Testing etc as required. Make the required Certificates and Declarations (see PED and EN13480-5 Metallic Industrial Piping - Part 5: Inspection and Testing).

Items to be removed or blanked off prior to flushing/testing shall include, but shall not be limited to: • •

• • • •

•

•

Equipment not included in the test system. Any items not designed to withstand the test pressure (all instruments e.g. pressure gauges, bellows, expansion joints, flexibles, check valves, etc.). Safety valves and rupture discs. Orifice plates, flow nozzles or other similar restrictions. Venturing type flow meters (flanged). Internals of equipment (trays, demisters, level instrument floats, float cages, etc.), if included in the test system. Flanged control valves (for welded-in types control valve internals shall be removed). Internals of strainers and filters.

For flanged control valves with block valves and a bypass, the block and bypass valve shall be left open, with the control valve removed and blinds or spool piece installed, if the test pressure up and downstream is the same. CONTRACTOR shall supply spools to replace any item removed. Blind flanges, blanks, caps or plugs with adequate pressure rating shall be installed to isolate piping systems and equipment as indicated on the test diagrams. CONTRACTOR shall supply these items. All temporary installed items (blanks, gaskets, spools, strainers, etc.) shall be adequately marked using paint (orange) or tags for easy traceability. For stainless-steel piping, the duration of the flushing, hydro testing and draining/drying sequence shall be kept as short as possible; in order to reduce the possibility of chloride induced corrosion damage. When flanged valves are present in a test system, testing against a closed valve is only permitted when the valve and its closing mechanism is suited for the test pressure, and approved by COMPANY. Where the test pressure to be applied to the piping is greater than the maximum allowable test pressure for valves, the valves shall be blinded off on the side to be tested, or removed and replaced by dummy spools. Unless otherwise noted, all valves are to be through body tested. First block valve for pressure instruments shall be included in the test.


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Piping containing check valves shall have the source of test pressure on the upstream side. If this is not possible, the check valve disc shall be removed or jacked open. Ball valves shall be pressure tested in the half open position. Other valves shall be tested in the fully open position. Test systems without equipment or closed valves may be combined when approved by COMPANY. Testing shall not take place with system temperatures 7°C or less, or where ambient temperature during test falls by 5°C or more, nor during rain or fog unless under suitable cover. Hydrostatic pressure test may however be performed under a lower temperature with a proper frost preventive added to the test water after approval of COMPANY. During the test, the ambient temperature shall be checked. When ambient temperature increases, test pressure shall be witnessed carefully to avoid any damage to the pipe spool due to over pressurizing. Items excluded from pressure tests are: • •

All small bore instrument control piping downstream the first piping block valve; Open drains and vents to atmosphere (leak test only).

6.3 Safety and Environmental Control Before starting any pressure test or flushing operation, the adequate measures for safety and environmental control shall be established. All local regulations and requirements by COMPANY shall apply. The test area shall be strictly closed for unauthorised personnel when tests are performed. The test area shall be marked with yellow / black plastic marking strips and a warning label stating ‘“NO ENTRY - PRESSURE TEST IN PROGRESS” Piping systems subject to extended hydrostatic test periods shall be provided with a protective device to relieve excess pressure due to thermal expansion of the test fluid. The release pressure shall be agreed with COMPANY. Care shall be taken that as little test liquid as possible is spilled over the paving to prevent muddy and/or icy roads, or the damage of equipment, instrumentation or insulation. As pneumatic testing represents especially high risks, utmost care shall be taken during pressurisation and inspection of the systems to prevent any danger from personnel, equipment and environment. Therefore pneumatic testing shall be performed in several steps. •

•

Step 1: A preliminary pneumatic test at no more than 1.7 bar(g) shall be performed according to ASME B31.3 paragraph N345.5.5. Step 2: Pneumatic test of all applicable pipe spools at a test pressure of maximum 1.1 times design pressure or otherwise defined according the applicable design code.

Note: Necessary precautions and actions shall be aligned to the national legislation, and the requirements of the NOTIFIED BODY. Previous steps 1 and 2 shall be seen as a minimal requirement. All pneumatic testing has to be authorised by the relevant authorities and COMPANY.


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The use of chemical additives, i.e. wetting agents, biocides, inhibitors, etc., shall only be allowed when an environmentally acceptable disposal has been agreed with COMPANY and local authorities. 6.4 Test Equipment COMPANY shall approve equipment used for testing prior to use. Purpose built hydrostatic testing equipment, including filters, fills pump, pressurising pump, test gauges, relief devices, storage tanks, test and flushing medium, and shall be supplied by CONTRACTOR. CONTRACTOR shall supply an air compressor suitable to supply dry, clean air at the pneumatic pressure test level, unless otherwise agreed with COMPANY. For pneumatic pressure testing a pressure safety valve (PSV) shall be installed to avoid overpressuring. Accuracy of pressure gauge shall be at least 1-2% at full scale. The t est pressure shall be within 60% of the gauge range (20% from top and 20% from bottom). Pressure, temperature and time shall be recorded for all hydrostatic tests. Pressure gauges and recorders used to indicate and record test pressure shall be calibrated according to requirements. Normally minimum one gauge shall be positioned at the highest point of the system. The static pressure shall be considered (see Piping Specification for allowable pressure). If there is a deviation of more than 2% between gauges during test, the test shall be stopped and the equipment recalibrated. All test pressure gauges shall be calibrated prior to testing. Calibration certificates shall be available at the worksite and all gauges shall be properly identified to enable traceability to the calibration certificates. Calibration of gauges shall be repeated minimum once a year or whenever requested by the inspection team (representatives from the authorities, COMPANY and CONTRACTOR). CONTRACTOR shall supply test blanks. Design and dimensions shall be in accordance with the related pipe class. 6.5

Test Medium

6.5.1 For Hydrostatic Testing All flushing and hydro testing for carbon-steel and stainless steel systems shall be performed with clean water (maximum chloride content 100 ppm). The pH value shall be between 6.5 and 7.5. Prior to use, the water shall be analysed and the results reported to COMPANY. Use of corrosion preventing chemicals shall be considered and approved by COMPANY when hydro testing carbon steels. The chemicals shall be compatible with the process Care shall be taken that flushing and testing water can freeze, neither in the storage tanks nor in the piping systems. CONTRACTOR has to provide heating or insulation, in case the


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risk of freezing exists. Necessary measures shall be agreed upon with COMPANY (antifreeze or steam heating). For hydrostatic testing the test medium shall in general be water, except that other suitable liquid may be used if: • •

•

The piping or inline equipment would be adversely affected by water; If the liquid is flammable, it's flash point shall be at least 49°C and consideration shall be given to the environment; The liquid to be used is approved by COMPANY.

If the test medium cannot be guaranteed clean, it shall be filtered through a 10µm filter when filling the system. 6.5.2

Austentic Stainless Steel •

•

•

•

•

•

•

•

Equipment such as shell-and-tube heat exchangers may have crevices, which prevent proper draining and mechanical drying. When flushing with condensate, boiler feed water or demineralised water, it is essential that all surfaces previously wetted during the test are flushed. The quantity and velocity of the flushing water depends on the equipment volume and shall be determined in consultation with COMPANY. Removing water or drying by blowing with hot air or gas shall not be performed unless the testing or flushing has been done with condensate; boiler feed water or demineralised water. In locations where water of the required quality is not available (initially or permanently), temporary facilities shall be used (e.g. mobile packaged demineralisation units) to prepare the test water. The risk of pitting corrosion is considerably reduced if the time between hydrostatic testing and start-up is short. Clean systems, and the use of boiler feed water or condensate as test water, minimise the risk of Microbiologically Induced Corrosion. Consider the use of biocide to minimise the risk of Microbiologically Induced Corrosion if all water cannot be drained or dried out (more than three weeks before start-up). Steam-traced or electrically traced systems should be tested or at least properly flushed with condensate or demineralised water prior to the functional testing of the tracing. Stainless steel bellows should preferably be isolated from the system during hydrostatic testing. If this is not possible, the hydrostatic testing shall be done with condensate; boiler feed water or demineralised water.

6.5.3 Ferritic Stainless Steels and Medium/High Nickel Alloys Due to the possibility of pitting corrosion, the paragraph above for austenitic stainless steel, shall also apply to ferritic stainless steels and medium/high-nickel alloys. 6.5.4 Duplex Stainless Steel Duplex stainless steel is highly susceptible to crevice corrosion when in contact with oxygencontaining water. The preferred hydrostatic testing method is to use potable water and to carefully rinse the equipment immediately after the pressure test with condensate; boiler feed water or demineralised water, followed by thorough drying the equipment and filling with nitrogen in such a way that all oxygen is removed from the system.


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6.5.5 9% Nickel Alloy Steel When hydrostatically testing equipment manufactured from or containing 9% Ni-steel, the water used shall be clear and free from sulphides which may otherwise precipitate stress cracking of the equipment. Complete and thorough draining and drying of the equipment is required after the removal of the test water. 6.5.6 Aluminium and Aluminium Alloys The test water shall be of a neutral pH (6 to 7.5) value and free from ions of heavy metals, e.g. copper, nickel and iron. These metals are readily deposited on the aluminium surface and cause severe pitting. The equipment shall be thoroughly cleaned and dried after removal of the test water. 6.5.7 For Pneumatic Testing Where the test packages indicate that a pneumatic test must be performed, the test media shall be oil free, dry air or any inert gas. The use of air for testing shall be limited to a maximum pressure of 7.0 bar(g). Above this pressure nitrogen shall be used. For instrument/utility air systems, where the introduction of water is undesirable, test media shall be air or inert gas. 6.5.8

For Alternative Leak Test and for Service Test These tests shall be performed with the fluid designated for the line.

6.6 Disposal A wastewater disposal plan, which will specify the handling of the water used for flushing and pressure testing, shall be prepared and agreed upon by CONTRACTOR and COMPANY. The disposal of flush and test water via the plant sewer system shall only be allowed after COMPANY’s written approval at the specified flow rates. An estimate of the expected quantities flow rate and quality of the wastewater shall be prepared by CONTRACTOR. 6.7

Test Procedure

6.7.1 Hydrostatic Testing After acceptance of the preparations for pressure testing by COMPANY, the piping system will be released for pressure testing. The test pressure shall be as indicated in the hydrostatic test diagrams provided by CONTRACTOR and shall be in accordance with PED 97/23 EC or ASME B31.3 requirements defined under paragraph 345.4. All systems shall be properly vented (at the high points) while filling. Hydrostatic test pressure shall be applied by means of a suitable test pump or other pressure source. This pump shall be positively isolated from the system except when being used to pressurise the system. A pressure gauge shall be provided at the test pump discharge.


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The pressure shall be increased gradually. For test pressures over 100 bar(g), the pressure shall be increased in steps of 25 bar(g), providing sufficient time to check for leaks and to allow the piping to equalize strains during the test. In case hydrostatic testing through equipment is required, COMPANY will provide special instructions (e.g. maximum differential pressures on shell and tube side of heat exchangers) where applicable. The minimum number of pressure gauges for a test system is one. For large systems, more pressure gauges shall be installed at suitable locations in co-ordination with COMPANY and inspection organisations. When a union is provided downstream of an instrument block valve, it shall be disconnected during testing to prevent dirt or foreign matter from being introduced into the instrument. The outside surface of the test system shall be clean and dry before and during testing. An authorised person shall constantly attend the test pump during the test. Whenever the pump is left unattended, it shall be positively disconnected from the system, while the pressure gauge remains connected to the t est system. The test pressure shall be maintained for at least one hour for systems prior to start of inspection and long enough to enable inspection of the complete test system by the inspection team. Care shall be taken to ensure that over pressuring due to static head does not take place: • •

See the relevant Piping Specification for allowable pressure. See Attachment 2; Pressure Test – Static Head of Test Medium, for an explanation on this topic.

Re-testing of a system, if required, shall be performed at the same pressure as originally specified for the test. 6.7.2 Pneumatic Testing In general pneumatic pressure testing shall be avoided. Precautions: •

•

E

A calculation/safety evaluation to define stored energy in the equipment and safe distance from the equipment shall be performed by CONTRACTOR, and be subject to approval by COMPANY, before any pneumatic test is carried out. Formula for Energy (E) is based on HSE Guidance Note GS4 Safety in Pressure testing ISBN 0717616290.

=10000

.Pi .V.ln

 Pf     Pi 

Where: • • • •

E= Energy in Joule. Pi = initial internal (test) pressure in Bar absolute. Pf = final pressure in Bar absolute (1Bar absolute = atm). V = volume (contents) in m 3.


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Formula for safe distance as a function of E is based on: If E < 5.000.000J a safety zone with minimum radius = 20m shall be fenced. o If E >= 5.000.000J and E < 135.000.000J a safety zone with radius = between o 20m and 100m (ratio to the energy content) shall be fenced. If E>= 135.000. 000J a safety zone with radius = 100m shall be fenced. o See Attachment 3; Safety Distances for Pneumatic Pressure Test: Example, for an example graph. Within the test area a safe area shall be demarcated for the personnel involved in pneumatic pressure testing. Personnel may not leave this safe area as long as the test pressure is above the design pressure (highest allowable pressure) of the pipe system / equipment subject to this pneumatic test. Adjustment of test pressure shall be possible from the safe area. Only non-toxic and non-flammable gas shall be used. Air can only be used up to a maximum of 7 bar(g). Nitrogen is the preferred pneumatic test medium. Above 7 bar(g) the use of nitrogen is mandatory. When using nitrogen, the testing area shall be carefully ventilated and all necessary safety precautions shall be taken for pressure testing using nitrogen. The test shall be carried out with the minimum number of personnel in the vicinity. CONTRACTOR’s Supervisor in charge shall nominate one person to ensure that no unauthorised person shall be allowed in the affected area. The area shall be roped-off and a notice “NO ENTRY - PNEUMATIC TEST IN PROGRESS” shall be placed at conspicuous locations.

Before the pneumatic testing, a minimum 10 % of all joints have to be checked using either one or a combination of the following inspection techniques: • • • •

Radiography Penetrant testing Magnetic particle testing Ultrasonic testing

This inspection shall demonstrate system integrity. The isolation of the equipment/project shall be with full rated blinds and inspected by CONTRACTOR’s Supervisor in charge to ensure that they are at the right locations. The whole pressure test operation shall be authorized, witnessed and approved by CONTRACTOR’s quality personnel, COMPANY representative and Authority representative (THIRD PARTY INSPECTOR / NOTIFIED BODY). Testing Procedure: • •

•

Pressurise the system to 50 kPa (0.5 bar(g)) and inspect for leaks Pressurise the system to 200 kPa (2 bar(g)) and inspect for leaks. All joints shall be soap tested Gradually raise the pressure to half the test pressure and hold for 15 minutes to equalise the strain


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Thereafter, gradually raise the pressure in steps of 1/10 of the test pressure with holding time of five (5) minutes between steps until the test pressure is reached and hold for fifteen (15) minutes Thereafter, reduce the pressure to 75% of the final test pressure and inspect the system. If necessary carry out another soap test to ascertain leaks. If no leaks found depressurise the system

Flanged joints shall be prepared for pneumatic soap testing by taping with masking tape and punching a 3mm diameter hole through the tape. In pneumatic testing, care shall be taken to avoid a temperature drop that could cause failure of metal and thermoplastics due to embrittlement. 6.7.3 Alternative to Hydrostatic or Pneumatic Pressure Testing (Alternative Leak Test) Alternative leak test shall normally not replace the normal pressure test where pressure test is required. However, under special conditions this test can replace the pressure test, but this must be evaluated on a case by case basis and approved by COMPANY and Authority representative. Additional NDT will be required. Lines to be tested shall be suitably indicated on the hydrostatic test diagram. An alternative leak test shall be performed with the line in service, i.e. with the service medium and at service pressure. The testing shall comply with ASME B31.3 Paragraph 345.9. 6.7.4 Initial Service Leak Test (Service Test) Initial Service leak test applies only to non-critical services, and shall comply with ASME B31.3 Para 345.7. This type of pressure test shall be subject to approval by COMPANY and AUTHORITY representative. 6.7.5 Draining and Drying The tested systems shall be depressurised by opening the depressurising valve in the test rig. After depressurisation, all vents and low point drain valves shall be opened and the system shall be thoroughly drained where the test medium is water or another liquid. Special measures shall be taken to prevent freezing in winter. All test systems, not subject to chemical cleaning, shall be dried by air (6 bar(g) when the system operating pressure is above 6 bar(g)) and expanded rapidly. Where required, trapped liquid shall be removed by blowing dry air or Pressurised Air Shock Blowing. Systems with drying requirement as defined in ‘Attachment 1 Fluid List’ shall be dried out after hydro testing with dry oil free air with a dew point of 5°C below the one day minimum ambient design temperature. Drying can be terminated when the dew point at the outlet is equal to the dew point at the inlet. Other methods, such as vacuum drying or air shocking, may also be used if the same dryness can be documented.


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If more than three (3) months to commissioning, drying shall be followed by preservation with nitrogen (overpressure 0.5 bar(g)) to keep the pipe system completely dry and to avoid condensation. Other alternatives are subject to approval by COMPANY. It is important that preservation should be adequate for the purpose intended, yet at the same time it is equally necessary to ensure that it is justified economically. Whilst the extent of preservation is primarily a function of the time for which a plant is to be standing idle, there are other factors which have to be considered simultaneously and it is recommended that this is best achieved through inter-functional discussions at local management level. Provision should be made for tagging all equipment after preservation, and for fixing the tags in a prominent position. For example, where nitrogen pressurisation is applied, the tag may read (must be in local language): CAUTION THIS VESSEL IS BEING PRESERVED WITH NITROGEN AT A PRESSURE OF 1 BAR (G). IT SHALL NOT BE DISTURBED WITHOUT PRIOR AUTHORITY FROM COMPANY. IT SHALL NOT BE TAKEN INTO SERVICE WITHOUT INSPECTION DEPARTMENT AUTHORITY. Reinstallation of the system shall be performed in accordance with the test procedure. Where permanent or temporary strainers have remained in place for the hydrostatic pressure test, they shall be removed following the test and thoroughly cleaned before reinstalling. Ends of pipes and nozzles shall be fully protected against the ingress of foreign material by the use of caps, plugs or plate blinds sealed with gaskets. These shall not be removed until just prior to final assembly. Flange parallelism and alignment to equipment shall be checked prior to reinstatement. Vent holes in reinforcing pads shall be sealed upon completion of pressure test. 6.7.6 Verification of Cleanliness All systems shall be internal visual inspected for acceptable cleanliness by spot check. Internal visual inspection includes the use of Boroscope, video etc. If pipe configuration in critical parts of systems as defined in Attachment 1; Fluid List, is too complicated for visual inspection, the PAS method or other suitable methods shall be used for verification of cleanliness. 6.7.7 Reinstatement After the completion of testing, chemical cleaning (where applicable) and drying, all systems shall be reinstated according to drawings and specifications. The reinstatement of the system shall include, but shall not be limited to: •

• • • •

Removal of all temporary auxiliary equipment such as spades, blinds, gaskets, pipe spools, temporary supports, etc. Replacement of all damaged gaskets and all test gaskets Positioning of spectacle blinds to the correct position Reinstallation of all items previously removed for hydro testing Reinstall unions of instrument piping


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Inspection of the completed system for correct flow direction of instruments, check and control valves, etc.

During the pre-commissioning of piping, no dirt, debris, etc., shall be allowed to enter into the piping system. Each pipe spool shall be inspected for cleanliness prior to installation. After approval by COMPANY, the system shall be released for further activities, e.g. steam tracing, painting, insulation, etc. The "stop" of pipe support springs with "down travel stops" placed prior to flushing, shall be removed at COMPANY’s request during pre-commissioning.

7

CHEMICAL CLEANING Lines to be chemical cleaned shall be identified on the P&ID´s and Line Index. For system overview see Attachment 1; Fluid List. A procedure shall describe in detail the steps for chemical cleaning. Chemical cleaning shall include: • • • •

Degassing Neutralisation Water flushing Drying

The end result shall be a clean smooth surface. Maximum temperatures used during these operations shall not exceed maximum design temperature for the systems as listed in the Line Index. For equipment such as turbines, generators, pumps and compressors, the piping to be cleaned shall have all sensitive items that can be damaged by the cleaning medium removed or blanked off. Normally the following items shall not be chemically cleaned if not otherwise agreed with COMPANY (items shall be identified on chemical cleaning isometrics by CONTRACTOR): All instrument tubing downstream the first piping block valve Piping systems with copper alloy materials Flexible hoses Vessels Exchangers Pumps All bolted/screwed valves and instruments Removed or blanked off items shall be cleaned separately prior to reinstallation. • • • • • • •

The systems to be cleaned shall have high and low point vents and drains installed. "Dead legs" shall be avoided. Cleaning shall be carried out after pressure testing unless otherwise specified.


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If the period between chemical cleaning and start of commissioning is expected to be more than three (3) months, then the system shall be preserved with nitrogen. Overpressure shall be 0.5 bar(g) (see Section 6.7.4; Initial Service Leak Test (Service Test)).

8

INSPECTION AND REPORTING CONTRACTOR shall prepare a final report, giving positive documented evidence that subject systems are pressure tested in accordance with agreed requirements. The test report shall be included in the final piping documentation. The documentation shall as a minimum include (in principle all documentation required/specified in EN 13480): • • • • • • • • • • • • •

• • •

9

Reference to documents and specifications Pressure test diagrams (P&ID) Isometrics with identification of: Heat numbers of components (only for PED category III, II and I) Weld numbers Welders identification WPS, WPR Approval of welders NDT reports Qualification and certification of NDT personnel CE certificates of components Agreed punch lists All required certificates (material certificates, test certificates, qualification certificates etc) Test results and duration A continuous log of operation, if applicable Signature of COMPANY representative, CONTRACTOR representative, AUTHORITY representative (THIRD PARTY INSPECTOR / NOTIFIED BODY)

ATTACHMENTS Attachment 1: Attachment 2: Attachment 3:

Fluid List & Piping Classes Pressure Test - Static Head of Test Medium Safety Distances for Pneumatic Pressure Test (Example)


BES-CO-05-003 Piping Flushing and Pressure Testing

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