testing of valves

8/4/2019 Testing of Valves

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PIPING-TESTING OF VALVES FORSERVICE TEMPERATURE 0 degC TO -196 degC


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-~I__Ii.. .,.Date Jan.31 '06 PIPING-TESTING OF VALVES FOR QCS /50100 /MP ITS /NA lO09Rev E1 SERVICE TEMPERATURE, Page 2 of 10

o degC TO -196 degC

CONTENTSPage

1.0 Scope . 32.0 References... 33.0 GeneralRequirements................................................................................. 44.0 AdditionalRequirements............................................................................... 45.0 Test RigAssembly.................................................................................... 56.0 Test Procedure. 6


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o degC TO -196 degC

1.0 SCOPEThis specification covers the testing requirements of Low Temperature Service Valves designed forthe following service classes.

- Class 1S0 1ROJL, 1ROJLR, 1R1B, 1R1BR, 1R3BS, 1R3BSR- Class 300 3ROJL, 3ROJLT, 3R1B1, 3R1B2, 3R1B3, 3R3BS- Class 600 6ROJL, 6R1 B, 6R3BS- Class 900 9R3BS

This specification is a general guideline for the test.Manufacture shall submit detail test procedures for Contractor's approval.2.0 REFERENCES

In this Specification reference is made to the latest version of the following Project Specifications,Codes and Standards, which form a portion of the testing requirements.PROJECT SPECIFICATIONSQCS/SO/00/MPITS/NAl211 Technical Specification for Cast CS and LTCS Gate, Globe and


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o degC TO -196 degC594598600

Check Valves: Wafer, Wafer~Lug, and Double Flanged TypeValve Inspection and TestingSteel Gate Valves ~ Flanged and Butt~Welding Ends, Bolted andPressure Seal BonnetsCompact Steel Gate Valves ~ Flanged, Threaded, Welding, andextended-Body EndsButterfly Valve, Double Flanged, Lug and Wafer~ TypePipeline Valves (Gate, Plug, Ball and Check Valves)

60260960BRITISH STANDARD SPECIFICATIONBS 6364 Valves for Cryogenic Service

3.0 GENERAL REQUIREMENTS3.1 Each valve type (gate, globe, check, ball & butterfly) and each body design I model I type (floating ball or

trunnion ball; solid wedge, flexible or parallel discs; swing type or tilting disc) of Impact Tested CarbonSteel and Stainless Steel Valves (-46C service and ~196C service) shall be qualified by low temperaturetesting at the specified design temperatures.

3.2 The Low Temperature Test shall be conducted on 10% of each valve type per size per pressure ratingselected at random from the total of the order(s) or lot(s) with a minimum of one valve of each type per


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o degC TO -196 degC

4.0 ADDITIONAL REQUIREMENTS4.1 Design of the valves shall meet the detail valve description listed in Contractor's Requisition andthe relevant references listed in Section 2.0 and the additional requirements of this specification.

For each valve to be tested, Manufacture shall issue an lnspection Certificate stating that the valvehas already passed the required tests, including shelll bonnet hydrostatic test and seat leak test, atambient temperature as per the applicable design standard and the specification.4.2 The valve to be tested, as well as the test equipment, shall be dry, dust free and oil free. The valve

components shall be thoroughly cleaned and degreased.4.3 Bolts shall be tightened to a predetermined force or tension per Manufacture's recommendations,and such force values shall be recorded and be available at the time of the test.4.4 The maximum force required to manually operate the valves under service conditions and duringfunctional test shall not exceed 350 N measured at the rim of the hand wheel or at the end of the

lever. For valve seating and unseating, it is permissible to increase the maximum force to 500N.


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o degC TO -196 degC

Measuring cylinderGas flow meter, soap film typeFlow rotameter for high leakage rates

The leakage to the outside of the test valve and test equipment shall be detected by means of amass spectrometer provided with a sniffer probe or another method suitable for helium leakdetection, subject to prior agreement between Manufacture and CONTRACTOR.

5.5 All measuring equipment (e.g. pressure, temperature and flow meters) shall have currentcalibration certificates traceable to National Standards or shall be capable of being calibrated "insitu" (e.g. by deadweight tester, certified reference gauge, etc.).

5.6 Correction factors for Helium temperature or volume changes shall not be applied to measuredleakage.6.0 TEST PROCEDURE6.1 Cooling Down Procedure6.1.1 Cooling down of the test valve shall be carried out by filling the test tank with the specified coolantup to the top of the body / bonnet flange connection. When liquid nitrogen is used as the coolant,


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o degC TO -196 degC6.2.2 After successfully passing the initial pressure test, the valve shall be operated 5 times successivelyby opening and closing through its full stroke, recording the initial opening force and the final

closing force. The operational test does not apply to check valves. A high pressure test (1.1 xRated Pressure) shall then be performed and recorded in pressure increments as follows:Class 150 - Test at 3.5 bar increments up to 1.1 x Rated Pressure of the valve.Class 300 - Test at 7 bar increments up to 1.1 x Rated Pressure of the valveClass 600 - Test at 15 bar increments up to 1.1 x Rated Pressure of the valveClass 900 - Test at 30 bar increments up to 1.1 x Rated Pressure of the valve

To allow for conditions to stabilize, each test pressure increment shall be held for a minimum of 3minutes for NPS 16 and below, and 5 minutes for NPS 18 and above.After completion of the high pressure test, the valve shall be stroked five times, opened against thefull CWP, measuring and recording the initial opening force and closing force. Seating andunseating forces shall also be recorded, and shall not exceed 500 N.

Note: Attention must be given to the hazardous nature of pneumatic testing.


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o degC TO -196 degC

APPENDIX A ( 1 / 2 )LOW TEMPERATURE TESTVALVE CERTIFICATE

Testing Laboratory:The Valve has been tested in accordance with the Technical SpecificationQCS/50100/MPITS/NN009 and found:

[ J Meeting all the requirements[ [ Not meeting the following requirements:

Report Reference Number:Valve Manufacturer:Contractor's IDENT Number:


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o degC TO -196 degCAPPENDIX A (2/2)

VALVE TYPE:SIZE AND RATING:. VALVE IDENT NO:

LOW TEMPERATURETEST RECORD DATEVALVE SEALING: UNI or 81 ~ DIRECTIONAL

TEST STARTED:TEST COMPLETED:

ROOM TEMPERATURE: _ROOM TEMPERATURE: _

TEST SEQUENCE AND TEST POINTS AND TEST RESULTSTYPE OF TESTS REQUIREMENTS LIMITSInitial Test Initial test pressure, Z bar.g bar.gValve operation First opening force, 350 N Max N (open)5 full strokes: First closing force, 350 N Max N (close)Leakage tests: Through the seat, ml/min/NPSml/min/NPS

NRelease pressure Seating and unseating force 500 N Max


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testing of valves

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