NFPA 20, 2010 ed., 4.30.1, "For all pump installations, including jockey pumps, each controller shall have its own individual pressure sensing line."
SML -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of å... .... Sent: Wednesday, September 21, 2011 7:58 PM To: [email protected] Subject: fire pump, pressure sensing lines, tap point (now with PRedV considerations) Here is an old thread that came close, but did not answer a question I had... 2010 NFPA 20 1 diesel, 2 electric Fire Pumps 3 jockey pump *** 6 pumps, 6 controllers *** demand: deluge systems, high-rise systems, DIPA systems, It is understood that pump pressure sensing lines will be plumbed between last check valve and last control valve, which are different locations for JP versus FP. But is it OK, per NFPA, to use pressure sensing lines that come from the same tap when used for FP-that-are- redundant? I don't see where a violation is at. **to add more fuel to the fire... there are 8, yes 8, PRedV's downstream of the FP's. Intention there was to avoid changing original POOR design practice of overpressurizing feed mains (the overdesigned pressure was in order to deliver at top of standpipes in a tower. I expect serious jockey pump cycling, if not continuous JP operation, because of these PRedV's. Client doesn't know what they are getting. Apparently, neither do the designers. Client may recognize this thread and get mad at me. I hope so. It may take rage to elevate design to a higher stage. If that is what it takes, then my mission is accomplished. Due to the authority and respect of this forum (not a plug at any one member per se, but the institution of this FORUM as a medium), the client may give credibility where previously, the designers were able to ignore well-intended-and- successful-long-term-strategies for choices-that-are-easiest-for-they- (the designers) to deliver. These choices, however Code complying, surrender the client's assets to head-aches, redesign, change-orders and delays. **** -- Scot Deal Excelsior Fire/Al Ilham Engineering Consultants gsm: +968 952 87345 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20110922/cfd69484/attachment.html> _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
