I think the cleanest way to calc the manual standpipe is to put a separate source (supply) at the inlet of the FDC using the 150 PSI @ 1500 GPM as your flow test. You may need to make your test S-150; R-149.5; & F-1500 to make your calc program work.
I believe the pumper truck will have a "variable speed" pump that can be adjusted based on the city supply so they can actually limit the discharge pressures accordingly. Again, I'm no expert on this, just my understanding. Chris Cahill is an ex-fire guy so he can probably give much more info if he's out there this AM. Steve Leyton is the standpipe guru but he may not be in his office today either. Cliff -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dewayne Martinez Sent: Tuesday, April 10, 2007 10:36 AM To: [email protected] Subject: RE: Manual wet standpipes I have always left the city pressure out but one of my designers questioned me on it after they did a calc showing a demand over [EMAIL PROTECTED] supplied by both the truck and city pressures. It just looked weird on the calc to see this. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Cliff Whitfield Sent: Tuesday, April 10, 2007 10:29 AM To: [email protected] Subject: RE: Manual wet standpipes Dewayne, I imagine there are some FD guys out there that will know for sure but I would believe that you would not include any pressure from the city water. I believe the FD would not want to pressurize the system beyond 150 PSI not knowing if the system components could take pressure beyond 175 since that is what most are rated. Cliff Fire Design, Inc. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dewayne Martinez Sent: Tuesday, April 10, 2007 10:23 AM To: SprinklerFORUM Subject: Manual wet standpipes We have a discussion in our office on the correct way to calculate a manual wet standpipe. Our local fire department pumper trucks are set for 150PSI @ 1500 GPM and contain a 1500 gallon tank For calculating a manual wet standpipe back to the fire department connection, should we only use the rated capacity of the pumper truck or are we allowed to add in the city water pressure/flow available at the hydrant at which they hook up to? IE: Either treat it as a stand alone fire pump off a tank or as a standard fire pump w/ city water supply added in. Thanks, Dewayne _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
