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NFPA 2018 Manufactured Assemblies Pressure Test

  • Tuesday, June 25, 2019 11:22 AM
    Message # 7655010

    NFPA 99-2018 Edition Section 5.1.6.2 Says:

     

    The leakage from a completed manufactured assembly shall not exceed 0.5 percent of the starting pressure when tested at 20 percent above operating pressure for pressure pipelines and 635 mm (25") HgV for vacuum and WAGD systems.

     

    Was the for a period of 24 hours intentionally omitted or should it still be there?

     

    2012 said The standing pressure test under 5.1.6.1 (4) shall be permitted to be performed by any testing method that will ensure a pressure decay of less than 1 percent in 24 hours.

    Last modified: Wednesday, June 26, 2019 6:32 AM | Jay D'Agostino
  • Tuesday, July 09, 2019 10:18 PM
    Reply # 7771666 on 7655010

    Hi Jay,


    Check out First Revision No. 985-NFPA 99-2018 [ Section No. 5.1.6.2 ] that addresses this issue in the 2021 edition.  They are changing from pressure loss to volume loss which will not require a 24 hour test.


    5.1.6.2  

    The leakage from a completed manufactured assembly shall not exceed 0.5 percent0.006 cm3/sec (0.00037 in.3/sec) of the starting pressure when tested at 20 percent above operating pressure for pressure pipelines and 635 mm (25 in.) HgV shall not exceed 0.002 cm3/sec (0.00012 in.3/sec) for vacuum and WAGD systems [e.g., 2 kPa (0.3 psi) starting when started at 415 kPa (60 psig), 0.3 mm (0.125 in.) HgV starting at 635 mm (25 in.) HgV].


  • Wednesday, July 10, 2019 9:41 AM
    Reply # 7773407 on 7655010

    In my opinion this comes from paragraph 5.1.6 (4) Standing pressure test per 5.1.12.2.6 or 5.1.12.2.7, except as permitted under 5.1.6.2


    In that paragraph 5.1.12.2.6 or 5.1.12.2.7, it clearly establishes that the test must be 24 hours and this must be witnessed by the authority that has jurisdiction or its designated


    So I think the term of the test is clear, and in 5.1.6.2 it refers only to the maximum pressure loss allowed

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