Sprinkler systems with high municipal water pressure
Sprinkler systems with high municipal water pressure
(OP)
I have a project where the municipal water pressure had a peak pressure of 169 psi when we did a 24 hour test. The building has an existing system, but no pressure relief valves, and thermal expansion has been raising pressures to as high as 250 psi on some of the systems. Obviously I will be installing relief valves on each system, but I am concerned about the relief valves operating the flow switch. Most pressure relief valves don't open or close at exactly the 175 psi limit, and I want to prevent an alarm if the relief valve doesn't shut of until ~165 or some such. Also, with pressures that high, there is a distinct possibility of the municipal water surging above 175 from time to time.
Does anyone have any ideas? The owner wants to eliminate all possibility of false alarms.
Does anyone have any ideas? The owner wants to eliminate all possibility of false alarms.





RE: Sprinkler systems with high municipal water pressure
one story building??
can you put one on the riser prior to the wter flow switch?? and then down stream?
http://www.cla-val.com/documents/pdf/CV_Fire_Produ...
check page 54 and 56
is the hyrdaulic calcs available to see what is needed?
RE: Sprinkler systems with high municipal water pressure
RE: Sprinkler systems with high municipal water pressure
RE: Sprinkler systems with high municipal water pressure
Thermal heating of the water in the pipe during the summer is probably one of the causes. This is an issue that is tough to deal with when you are already at 175. I have also seen pressures above the check valve on the riser climb up, and i agree 250 is pushing it. My experience is those little PRV (1/2 in for example) are not that great and end up loosing their calibration after a few years.
Unfortunately i dont have any other solutions to offer you, but i am curious to hear what others (sprinkler contractors out there?) have to say on this subject.
RE: Sprinkler systems with high municipal water pressure
RE: Sprinkler systems with high municipal water pressure
RE: Sprinkler systems with high municipal water pressure
RE: Sprinkler systems with high municipal water pressure