I would say you meet the requirements of NFPA. As a side note, this is usually due to an increase of temperature during the test, and also means you have a lot of trapped air in the system. I say all of this to say that you need to pay attention during the flow switch test. With a lot of trapped air in the system you may see the flow switch go into the flow position, then reset itself before it overcomes the retard time. If this happens, you will want to try to get as much of that trapped air out as you can, and redo the flow switch test.
Thanks, Skyler Bilbo On Wed, Jan 21, 2026, 6:51 AM <[email protected]> wrote: > Is it acceptable for a hydrostatic test to have a gain in pressure of 29 > psi for wet fire sprinkler system? I cannot find exact verbiage in NFPA 13 > about gain of pressure. > > _________________________________________________________ > SprinklerForum mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to > [email protected]
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