NO. As the tank empties or reduces to zero this head disappears. Assume the tank is nearly empty. That is the static head. If the tank is on a hill the elevation from base of the tank will provide you some static head. Art ATCO FIRE/Tiroly & Associates
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Leif Glans Sent: Monday, January 15, 2007 12:26 PM To: [email protected] Subject: Positive static head for tanks Hi! If one uses Centrifugal Pump according to NFPA 20, one should not use it if static suction lift is required (6.1.2, A 6.1.2) According to NFPA 22 4.1.3 for suctions tanks, the net capacity shall be the number of cubic meters (U.S. gallons) between the inlet of the overflow and the inlet of the vortex plate Is all of this volume considered positive head according to NFPA? Best regards/ Leif Glans www.lg-sprinklerkonsulten.com LG Sprinklerkonsulten PG Vejdes vag 15 351 96 Vaxjo Sweden Phone: +46 470-74 50 25 Fax: +46 470-74 50 26 Cell: +46 734-28 13 10 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
