4.6.2.3.1 in the general requirements for liquid supplies as well as several other sections including backflows and acceptance testing all state that 150% or the maximum demand if 150% isn't available. There is some commentary that suggests this situation may not be the best design practice, but that it is acceptable. There are some sections relating to the pump itself that indicate it shall be able to pump 150% of it's rated capacity without exception, but I'm pretty sure that relates to the pump itself, not the water supply, IE if the pump was attached to a better water supply it should be capable of 150%.
We had a local fire marshall order the city to loop an 8" underground main after rejecting the black and white print of #20 on this subject though, and he prevailed despite being wrong at a cost of about 150,000 to the tax payer, which irked me, but at least it wasn't in the town I lived in I guess. 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 IPA Sent: Thu 6/9/2011 6:28 PM To: [email protected] Subject: Re: Pump, Tank, 1000 ft suction line..... Yeah but the exception to the 150% requirement is under acceptance testing & maintenance. If you get out in the field after install and something ends up falling short then don't sweat it as long as you can provide the greater of either 100% or the system demand. Correct me if I'm wrong but I don't think the intention is to design a new install ready to fail from the beginning and from what I can gather the original poster is in the design phase. -Brian _______________________________________________ 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)
