Maybe a foot or so. I'm just guessing. Will have to find out if it is critical.
Tony -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ed Kramer Sent: October 31, 2008 9:45 AM To: [email protected] Subject: RE: Fire Pump Suction How much higher are the tank discharge flanges above the pump suction flange? Ed Kramer Littleton, CO > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:sprinklerforum- > [EMAIL PROTECTED] On Behalf Of A.P.Silva > Sent: Friday, October 31, 2008 11:32 AM > To: [email protected] > Subject: Fire Pump Suction > > > 400 gpm fire pump supplied from tanks with suction flanges higher than > pump suction flange. Approximately 100 feet of 4" piping (including > fittings) from tanks to pump. NFPA 20 permits the gauge pressure at > the pump suction flange to drop to -3 psi, with the pump flowing at > 150% (600 gpm in this case). The friction loss in the piping for 600 > gpm flow is about 7.6 psi. Is there a concern for the pressure > available at the pump suction, when the water level drops in the > tanks? I have been told that it will, so checking the opinion of the > forum. > > Tony > > _______________________________________________ > Sprinklerforum mailing list > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > For Technical Assistance, send an email to: > [EMAIL PROTECTED] > > To Unsubscribe, send an email to:Sprinklerforum- > [EMAIL PROTECTED] (Put the word unsubscribe in the subject > field) _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [EMAIL PROTECTED] To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [EMAIL PROTECTED] To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
