If you had 50 ft of 1.25" copper pipe and tried pushing 150 gpm through it you're looking at >45 fps velocity and around 75-80 psi pressure loss not including a backflow and water meter. At 150 gpm you're looking at approximately 103-104 residual to work with.
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 Mark Sornsin Sent: Monday, April 04, 2011 12:56 PM To: [email protected] Subject: RE: Design solution needed Joel: If it's a short run of 1-1/4, you might get lucky. Say less than 50 equivalent feet. Your maximum volume demand (I'm guessing) is 0.15 x 900 sq.ft. = 135 gpm + overage. Maybe 165 gpm. You've got a relatively large amount of pressure. Maybe you can get it to work; or maybe you can get a waiver on some or all of the outside hose allowance. Many jurisdictions are willing to work with you if it means avoiding the cost (short term and long term) of a pump and tank. There is no minimum for fire protection lines if the calculations can support it. Of course, if you have an authority that places maximum velocities on pipes, then you'll have problems... Mark A. Sornsin, PE| Fire Protection Engineer Ulteig Engineers, Inc.| Fargo, ND [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Joel Chaim Sent: Monday, April 04, 2011 11:20 AM To: [email protected] Subject: Design solution needed I'm designing a system for a small restaurant, the kitchen is a OH-I occupancy, and the dining area is a LH occupancy, the available static pressure is 106 psi residual 62 psi with 751 gpm. My problem is that the incoming service is a 1¼", and to bring in a larger service is very expensive because of utilities and other obstruction that's in the way, the GC suggested that we put in a tank and booster pump, to me it sounds crazy to install a tank and pump for a building that's less than 4000 sq. ft. when you have available city pressure. Any ideas how to go about this, please advise. Best Regards, Joel Chaim | Nicet level II _______________________________________________ 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)
