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  1. staedtlerwtc

    Hydrostatic pressure test increased?

    I have a hydrostatic pressure test for a HWS/R system, 1-1/4" pipe, approx 40 ft in length. Initial test pressure was 225psi and after 4 hours the test pressure increase to 280psi. I'm used to test pressure decreasing due to a leak but never seen test pressure increase by 55psi. I understand...
  2. staedtlerwtc

    NFPA 13, 8.15.4 Vertical Openings and Draft Stop

    NFPA 13, section 8.15.4 Vertical Openings, specifies a draft stop of at least 18" deep. 1) Where do you measure this 18"? Do you measure it from the top of the ceiling? or do you measure it from the sprinkler discharge? 2) In addition, it specifies the horizontal requirements of sprinklers...

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