Also what is the highest demand sprinkler or standpipe system ? Is pump is overdesign see if modification to fire pump be done I.e. Change impeller Sent on the Sprint® Now Network from my BlackBerry®
-----Original Message----- From: "Morey, Mike" <[email protected]> Sender: [email protected]: Thu, 25 Aug 2011 08:44:07 To: <[email protected]> Reply-To: [email protected] Subject: RE: Pressure reducing valves on system risers Can you provide a pair of PRVs at each manifold? Typically we'd look at a large valve (say 6 or 8") with a bypass through a smaller valve (maybe a 3"). Large PRVs have a minimum flow rate much higher than one sprinkler would flow so the smaller PRV allows for low flows like those that would be found when a single sprinkler activates. Mike Morey, SET, CFPS Sprinkler Designer BMW Constructors, Inc. O: 317.651.0596 | C: 317.439.2695 www.bmwc.com ________________________________ From: [email protected] on behalf of [email protected] Sent: Thu 8/25/2011 8:32 AM To: [email protected] Subject: RE: Pressure reducing valves on system risers Ah there's the rub. This is a multi-building manufacturing site. HUGE! A mixture of very large buildings and some not so large, multi-story and single story. But a single story could be 50 ft high. The problem is that the pump is overdesigned. Not sure if the municipal supply changed or just a bad pump selection. Either way doesn't matter. Already been told that they will not make any changes to the pumps. So, any corrective action will be provided at the risers. They have a standard that dictates that buildings be zoned and that each zone is served by a separate riser. Case in point, a new 2-story, 60 ft high, 60,000 total sq. ft. building has 8 system risers fed off two manifolds, one at each end of the 300ft long building. I can't do combination standpipe risers either. Welcome to my world................. Craig P -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Matt Grise Sent: Thursday, August 25, 2011 8:25 AM To: '[email protected]' Subject: RE: Pressure reducing valves on system risers What is the building like? (are there upper floors that wont need PRV's?) what is the water supply like? Matt Grisé PE*, LEED AP Sales Engineer Alliance Fire Protection 130 w 9th Ave. North Kansas City, MO 64116 *Licensed in KS & MO 913.888.0647 ph 913.888.0618 f 913.927.0222 cell www. AFPsprink.com -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Thursday, August 25, 2011 7:21 AM To: [email protected] Subject: Pressure reducing valves on system risers Got a major client whose system was poorly designed. They have their jockey pump set for about 200 psi and their main fire pump is putting out 180-190 psi. The local fire marshal has mandated that they provide pressure reducing valves on the system risers for all new systems. Anyone ever done this? Any recommendations? Forget about doing the logical thing and looking at the pump, there is very little common sense here and the process of change is long and painful. Craig P _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ 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 -------------- A non-text attachment was scrubbed... Name: winmail.dat Type: application/ms-tnef Size: 6030 bytes Desc: not available URL: <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20110825/5d49a3fd/attachment.bin> _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
