If I was the AHJ, and you meet the system demand, I don't think I have a leg to stand on.
Meeting 150% could next mean putting in a smaller pump, calc'g it at 140% of capacity to meet demand, and being able to hit 150%. THAT would meet what some think the code says, but would be a crappy design. Better to use a larger pump and not design to 140% 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 IPA Sent: Friday, June 10, 2011 11:58 AM To: [email protected] Subject: Re: Pump, Tank, 1000 ft suction line..... Thanks for the reply. It looks like Mike's reference to 4.6.2.3.1 is actually new to the 2010 ed. (being under sources in gen reqmnts) I was wondering why my search in 2007 ed. only showed the exception to 150% in the acceptance testing section and the backflow evaluation. But that is good info to know. What about where the city supply is capable of providing 150% but private service main was undersized by the GC and will therefore not meet 150% because of the friction losses solely in this portion of the line? Would it be acceptable to settle for system demand or should a new line have to be ran since technically the "source" (the city supply) is capable of the full flow? On Fri, Jun 10, 2011 at 5:29 AM, George Church <[email protected]>wrote: Hmm, I'm not sure why meeting the system demand is a failure. > So I have a site with a proposed building. > City can meet demand, but not the 150%. > You'd install a tank and pump while I bid pump. > Good luck with that conservatism in the real world. > > Had a Come to Pelosi mtg yesterday with GC, Owner, and "giraffe" PE*. > The PE allowed CPVC in nursing home BUT ONLY if owner gets a credit. > So the PE has specified a system that meets code, but with steel pipe > so the owner pays more than he should have to for it. > That's is NOT being a good agent for the Owner. > Again, ivory tower vrs contractor. > Also, PE insists he has never heard an owner complain of overflowing a > mop sink or 3" floor drain with a 2" main drain test. > I asked if he'd ever personally witnessed a drain test like we were > discussing. No, he hadn't. > I told the owner I'd seen mop sinks overflow with ITC flow, 1/2" > orifice, and we think a 2" main drain test isn't going to have water > all over the floor? > Again, people who have NO field experience advising an Owner what does > and doesn't work. > Ken pointed out that the PE wouldn't get the call from the owner. > Their maintenance guy would call the GC who would call us and fix it. > > So now you know why I'm such a fan of design-build. > The PE was fine with specifying 4" galv 40 threaded for the ATTIC > sprinklers.... sure, that's a great installation with economy and long > life, eh? > Actually, this PE had specified the open wood truss attic to be > protected by dry pendent sprinklers screwed into exposed piping in the attic. > Hey, that is great fire protection. They cost more than ATTICs, they > need to be tested every 10 years, and the deflector distance might be > extended. > How can you, when bidding, tell when the guy is wrong, or if he just > wants somehtng really weird? > The PE also routed the 4" supply thru an open breezeway, outside in PA. > Duh...he didn't complain we fixed that routing. > > George L. Church, Jr., CET > Rowe Sprinkler Systems, Inc. > PO Box 407, Middleburg, PA 17842 > 877-324-ROWE 570-837-6335 fax > [email protected] > > > _______________________________________________ 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)
