It does stink to have to install a prv for a single floor but the code is the code. It happens all the time in high rises when you hit the 175 break. Double check the JP settings, JP off should be right on churn (technically maximum expected churn) or 3-5 PSI above for fluctuating street supplies.
TD Ron, 1. The engr firm is correct...anything over 175-psi requires a PRV and the maximum expected static pressure (churn pressure) is used to determine where the PRV's are required. 2. If you do not put the PRV and something starts to leak and cause water damage, then you will assume responsibility. 3. I agree with you 100%...that the churn pressure only exists during the pump tests and that a city water supply may vary as much as 10 to 15-psi during the day so most of the time it will actually be less than 175-psi. 4. I also feel that installing a PRV for the "excessive" 3-psi is a waste of time and money. The hydrant test was done with a gauge that was bouncing around between 4 to 6-psi, and what if it was only 176-psi instead of 178-psi. However, I am not the responsible party to address this issue from a liability perspective. rick _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
