the probability of a pumper or 2nd-due engine gettin the connections wet is more ProbablY good odds if there is fire showing.
foam in the tank is possible, though highly improbably as it is usually inducted at a hose outlay rather than poured into the belly of the engine's tank. what we are arguing over (probability of a engine contaminating a potable water supply) is best visited by those that do this work: engineers on fire trucks. They know the Probability of them contaminating potable water is very, very low, for most municipal jurisdictions. These musings will continue to be just that, until the people who are doing what we are talking about, weigh in. What happened to common sense? Out in Enviro world, I hear of people using Ca(SO4)2 to precipitate dissolved chlorine from water flow test discharge. I thought the disassociation constant for Sulfates were much lower than for Chlorides, even without speaking to the fact of mixing times. Are we trying to solve a problem that may not exist in epidemiological terms? NIH must have stats on that. I don´t think pumpers in large cities are doing much drafting from ponds. Leakage creeping around a 15 year old BFP holding back sprinkler muck-water... that is another story. scot deal excelsior fire On 7/13/07, Michael O'Brian <[EMAIL PROTECTED]> wrote:
How about an end thought as the day winds down. I spoke with the ICC about the RPBP vs DDC thing out of the IPC Specifically section 608. The funny part about this section is that it speaks to a DDC throughout the section except when you have antifreeze or foam in the system. The unique part is the commentary of the code. The commentary (for you sprinkler folks that's like the handbooks in ICC language) speaks very specifically that if a non-potable water source is used in a fire truck then a RPBP is required. That is every single fire truck in the US. If they suck out of a pond, use hose to connect to a hydrant, use foam in a tank, use any solvent or the like in the tank, etc. . . What is frustrating to me is that this language is very clear in the commentary. If that is what the "intent" truly is, then change the code language to reflect the commentary. I work for many municipalities and work on the AHJ side and this is a tough issues. What is truly the probability of a Fire truck pumping into a FDC? I think we all can agree that the RPBP is a maintenance nightmare. If you want I can summarize the commentary language on a future email. Michael O'Brian Code Savvy Consultants www.codesavvyconsultants.com 313-618-6401 Fax 313-557-0294 ************************************************ Take a look at www.inspector911.com the first site dedicated to code enforcmenet (inspectors, fire marhsals, building officals, and plan reviewers). -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of John Drucker Sent: Friday, July 13, 2007 10:11 AM To: [email protected] Subject: RE: Backflow: Sprinkler System Roland Take a look at this; 2006 NSPC 10.5.9 - Exception (3) "Where fire protection include a fire department connection, double check valve assemblies shall not be permitted." John -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Roland Huggins Sent: Friday, July 13, 2007 10:04 AM To: [email protected] Subject: Re: Backflow: Sprinkler System One of the aspects that drive an RPZ is when the fire dept draft from non-potable sources (anytime). Roland _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
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