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I'm not sure I get it. How can a hydrostatic pressure cause the pipe to shrink, w/o temp change? Am I missing something?

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...

Thanks for your input cdafd. Hoepfully I can get further opinions from other members.

Correct the picture you are talking about is attached. It shows the sprinkler flush with the ceiling, however the design I'm looking at is not. It is approx. 10 inches below the ceiling. Thanks for the...

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...