So it's contractual, not philosophical. Presumably, the installing contractor tests it ...
I don't think we're talking about testing the backflow appliances itself for functionality - that's best left for the "certified backflow technician." If you pump up an UG including the BFP, the relief valve will only operate when there's a differential between the clappers. So an RPZ or RPDA usually weeps a bit when you pump it up, but once the line is equalized you can run a conventional hydro. And if you just want to test against it, you can pump up through the FDC or main drain or the supply-side tap on the riser check, if so equipped. Steve Leyton Protection Design & Consulting -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Coastal Sent: Thursday, May 29, 2008 7:10 PM To: Steve Leyton Subject: Re[2]: 200 psi test for components rated 175 Hello Steve, I start 1' AFF with my work. I sub out any underground installation work I get (which I try to avoid) and it is up to them to test it. Only question I have is how do you get an RPZ to hold the back pressure to hydro to it? Pump the system up through the #1 test cock? -- Best regards, Charles Thurston Coastal mailto:[EMAIL PROTECTED] Thursday, May 29, 2008, 6:55:37 PM, you wrote: > I'll bite - why not? If the Fire Department pumps into the FDC, isn't > it likely to back pressure the BFP to at least 150? And if so, wouldn't > it be prudent to test the assembly? > Steve Leyton > Protection Design & Consulting > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Charles > Thurston > Sent: Thursday, May 29, 2008 3:30 PM > To: IPA > Subject: Re: 200 psi test for components rated 175 > Hello IPA, > I for one have never put 200 on the backflow, I will not either. > Thursday, May 29, 2008, 6:03:25 PM, you wrote: >> I've got this question posed to me: >> Backflow preventor is rated at 175 (as are most of the fire sprinkler >> components) yet we are required to do a 200 psi test. Is the keyword > here >> "working pressure" of 175 psi or am I missing something? >> thx, >> _______________________________________________ >> 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)
