Yes, you must correct for elevation. Paul J. Pinigis, P.E. Chief Life Safety Engineer
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Todd Williams - FPDC Sent: Thursday, December 13, 2007 5:52 PM To: sprinklerforum@firesprinkler.org Subject: Flow test effective point. I thought I understood this, but maybe not. When determining the effective point for a hydrant flow test, I was told that it is at the junction of the flowing and non-flowing water. (for the purposes of this discussion, let's assume that we are talking about a single main, fed from both directions, with hydrants on branches off the main. Pressures are read at one hydrant and another single hydrant is flowed) If this is the case, then the effective point of of the flow test would be at the junction of the main and the branch to the hydrant where the pressures are read. However, this junction occurs underground. If we assume that the gauge on the hydrant is 1'-6" off the ground and the main is 5 ft underground, this would mean that the pressures are read 6.5 ft above the effective point. The pressures at the effective point would be 2.8 psi greater than those read at the hydrant. Is or should a correction be included? This makes a difference on programs such as Autosprink where you draw a 3D model of the underground system and insert a supply at the effective point. Todd G. Williams, PE Fire Protection Design/Consulting Stonington, Connecticut www.fpdc.com 860.535.2080 _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org 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 Sprinklerforum@firesprinkler.org http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
