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)
