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:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
