We've run surge analysis on systems where there have been pipe fitting failure due to potential extreme system surges due to improper design or equipment selection or poor installation practices. It takes specific software and a lot of time. The surge software can identify spikes, reverse flow, hammer, negatives, etc. When you put the data loggers on the systems and run the tests it's pretty amazing what water does in a fire protection distribution system when a pump comes on for example.
Craig L. Prahl, CET Fire Protection CH2MHILL Lockwood Greene 1500 International Drive Spartanburg, SC 29304-0491 Direct - 864.599.4102 Fax - 864.599.8439 CH2MHILL Extension 74102 [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of George Church Sent: Monday, January 24, 2011 6:24 PM To: [email protected] Subject: RE: Hangers and pressure surges I'll ask the rhetorical question, wince, and hope for no answer: How would one determine the "surge" pressure since it would have variables like velocity of water upstream causing the spike, and I'd assume you'd determine that empirically. Ok, we've got to run a flow test and a water hammer test? Put a recorder on hydrant and leave it a week or 2? How are you gonna catch the spikes? If we had to do this, I think I'd remember how to figure it. And we do- its the static pressure. glc -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Thomas Watt Sent: Friday, January 21, 2011 12:11 AM To: [email protected] Subject: Re: Hangers and pressure surges Wouldn't every system with a FDC potentially see operating pressures above 100# ? Thomas Watt Foreman/Service Tech On Thu, Jan 20, 2011 at 3:28 PM, Roland Huggins <[email protected]>wrote: > I don't believe it was the intent to apply the requirement to the > possible build-up of pressure from surges but to the actual available > supply. The definition in 3.3.19 does state exclusive of surges. > Combined with the new expansion of requiring a relief valve on all wet > pipe systems instead of just gridded systems (7.1.2.1 2010 ed), says > to me that it's the characteristics of the water supply that drive the > requirement. > > Roland > > > > _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.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) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.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) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.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)
