Hence the duplex gauge on suction side of pump; basic.
> Subject: RE: Minimum pressures in water supply; Why 20 psi? > Date: Thu, 25 Aug 2011 10:25:37 -0700 > From: [email protected] > To: [email protected] > > Several years ago a fire pump test was run on a new warehouse retail store in > a semi-rural area with inadequate water infrastructure. The area is what > planners call an X-burb, outside of a medium-sized city in Michigan, if I > recall correctly. The water system was being upgraded to serve the new > center where the subject building is located, but work was well behind > schedule and would not be done in time for the soft opening of the store. > In spite of advice to the contrary, the installing contractor did a > preliminary run test that pulled a vacuum in the public main system and > caused a LOT of damage up the line to other users'. > > It's not likely, but it can happen and a vacuum is definitely an undesirable > condition with way more significant consequences than empty pipe. > > SML > > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of George Church > Sent: Thursday, August 25, 2011 9:55 AM > To: [email protected] > Subject: RE: Minimum pressures in water supply; Why 20 psi? > > Awesome observation of the obvious others missed :) > > > George L. Church, Jr., CET > Rowe Sprinkler Systems, Inc. > PO Box 407, Middleburg, PA 17842 > 877-324-ROWE 570-837-6335 fax > [email protected] > > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of > [email protected] > Sent: Wednesday, August 24, 2011 10:27 AM > To: [email protected] > Subject: RE: Minimum pressures in water supply; Why 20 psi? > > If <20 psi would collapse water lines, how do they remain intact when empty? > > > > 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] > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20110827/919cc005/attachment.html> _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
