This may be more of an issue with the Indicator post not being calibrated to indicate that the valve below is open when it is in fact partially or nearly fully closed. Ran into this before. PIV installation must indicate valve to be fully open when fully open.
Ryan L. Hinson, PE*, SET Fire Protection Engineering Group Burns & McDonnell Direct: 952-656-3662 Mobile: 320-250-5404 *Registered in: MN -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Jamie Seidl Sent: Monday, November 24, 2014 9:13 PM To: [email protected] Subject: Re: Frozen open PIV I am always surprised at how many left handed valves there are out there. While investigating some issues with a new fire pump Installation in Charlotte, we found 3 left handed valves, 1 open, 1 half closed, and 1 3/4 plus closed. I really don't like these, especially on a gridded underground system because unless you have a very diligent inspection dept, it is way too easy to leave a valve closed. In our situation, we caught the low flow due to the fire pumper test suction dropping to +\- 10 psi @ under 500 GPM. It ended up being a secondary main feeding hydrants had been inadvertently shut down, thinking the valves were open. Since it was a secondary main, the fire pumps were fine, but the hydrants wouldn't function for fire flows. Just something to think about for all those civil engineers on here... Jamie Seidl Sent from my iPhone > On Nov 24, 2014, at 9:13 PM, <[email protected]> wrote: > > Did you check to see if it is a left hand valve? I've run into this in the > past. > > Mark at Aero > 602 820-7894 > > Sent from my _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
