Do you need to call the AHJ? If so I would just explain the situation as you did here and ask what they want the pressure regulated to.
Forest Wilson Sent from my iPhone On Jul 7, 2013, at 12:32 PM, "Tom Duross" <[email protected]> wrote: > Early post for the upcoming week. > > I have a system to test, circa late 70’s installation. Class 3 (assumed), 2 > ½” FDV’s with 1 ½” reducers and caps. > > > > According to #25 the system should be tested to the appropriate standard it > was installed under. > > This all make perfect sense, some digging is required on my end as to what > (if any) edition of #14 was in place at the time of installation. My > question is more towards the devices installed. > > The system has older FDV’s cast saying Pressure Reducing Valve. They’re the > type with the locking clip on the handle stem that keeps the valve from > being opened to a certain %. Most of us know these are no more Pressure > Reducing Valves than a standard angle type hose valves available yesterday > or today. > > There’s 90 PSI at the top of the standpipe, gauge looks accurate, drops when > petcock is closed and the gauge is loosened. Standpipe is 4” and runs up 8 > stories. So I’m assuming around 140 PSI of the building’s fire pump as > system pressure there. Under 175 anyway. Pretty sure 140% was the FP rule > then, so 90-65 would seem in the range of design. No drain risers btw. > > > > Because these valves are labeled as PRV’s, I have to test everyone. Now, I > do have to check for the applicable edition of #14 and also the applicable > Building Code because they sometimes have specific verbage for standpipes > that could trump #14. If I find no specific direction in either the Code or > Standard requiring these, and I find for example the Code required 500@65 > for a design; I’m wondering how to approach the AHJ in requesting I remove > and replace them with standard FDV’s off the shelf. > > > > Some are missing their pins, some the locking screws are gone too. > Installing standard valves would save testing 8 floors of FDV’s from now on, > maybe improve outlet flow. Any thoughts. > > RIP GLC, > > Thomas Duross > > The Fire Pump Testing Company > > 11 Varney Street > > Jamaica Plain, MA 02130 > > T 617-971-0700 > > F 617-524-7171 > > C 617-592-4236 > > [email protected] > > > > _______________________________________________ > 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
