I always find the more interesting part of it to be, When is the flow test performed, and compare that to the water companies usage graphs and usage by calendar dates. Here in Steamboat, a resort community that relies heavily on winter occupancy for our commercial success, one would think that with all of the condos full and everyone using water that that would represent our max usage, and best time of year for flow tests. Actually due to City Required Landscaping and maintenance systems (irrigation) July and Aug are our high usage months and the best time to flow test. (5Am to 8Am) Required to keep that grass green all summer long even here in the industrial zone. These issues affect the flow numbers far more that the applied coefficients.
Then there's the whole "Hydraulic Model" we're forced to often use in July and Aug, because they forbid flow testing while the reservoirs are low. (Catch 22) The plus side is our State requires a 10% or 10Psi safety factor on all calc.'s and where we have 140Psi static and 100+Psi flowing 3500Gpm+ and almost all light hazard occupancies, no big deal. Thom McMahon, SET Firetech, Inc. 2560 Copper Ridge Dr P.O. Box 882136 Steamboat Springs, CO 80488 Tel: 970-879-7952 Fax: 970-879-7926 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Chris Cahill Sent: Thursday, February 12, 2009 11:07 AM To: [email protected] Subject: RE: flow tests using pumper connections You are correct on many fronts. There is an additional coef for flowing a large orifice (4", etc). Most AHJ's don't apply it. Most contractors don't apply it. It probably doesn't make a difference on LH and OH. But here in the land of 50 psi water it can. And to Thom's point any other type of orifice negates this extra coef. FYI I've never heard of using hose monster for this purpose other than previous reference on the forum. Chris Cahill, P.E. Fire Protection Engineer Sentry Fire Protection, Inc. 763-658-4483 763-658-4921 fax _______________________________________________ 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)
