I must have missed one. I only counted five.
At 11:47 AM 5/30/2008, you wrote:
six
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Gregg Key
Sent: Friday, May 30, 2008 8:37 AM
To: [email protected]
Subject: Re: 200 psi test for components rated 175
Speaking of such test, How many systems are installed with a means to
test the backflow at the required forward flow rate? like a wall
hydrant?
Thom McMahon wrote:
> Don't forget the derided full forward flow test!
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Steve
> Leyton
> Sent: Friday, May 30, 2008 8:42 AM
> To: [email protected]
> Subject: RE: Re[2]: 200 psi test for components rated 175
>
> 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,
>>> _______________________________________________
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>
>
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
www.fpdc.com
860.535.2080
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