Which would seem to be a better way to flow it instead of flipping the
check valve. Depends on the FDC, may still have to remove the clappers .
The 2" drain seems to be the most practical way to forward flow the
backflow. Since we do a 2" main drain test when we inspect.
Determination of GPM seems to be the only problem if we were asked to
prove that we met the demand of the system.
Here is a question for the engineering folks. NFPA 291 give an alternate
method of testing GPMs from a hydrant without using a pitot. It is to
install a test gauge tapped into a 2 1/2" cap on the hydrant and flow
hydrant. take the reading on the gauge while flowing water.
Could the same principle be applied to the main drain test? residual
reading?
Matthew J. Willis wrote:
The AHJ is following the example in the annex.
R/
Matt
Matthew J. Willis
Living Water Fire Protection, LLC.
1160 McKenzie Rd.
PO Box 877
Cantonment, FL. 32533
850-937-1850 Voice
850-937-1852 Facsimile
[EMAIL PROTECTED]
----- >-----Original Message-----
----- >From: [EMAIL PROTECTED]
----- >[mailto:[EMAIL PROTECTED] On
----- >Behalf Of Dewayne Martinez
----- >Sent: Monday, June 02, 2008 6:48 AM
----- >To: [email protected]
----- >Subject: RE: 200 psi test for components rated 175
----- >
----- >We have one AHJ that won't allow us to touch the check
----- >valve after the 200PSI test because we are "altering"
----- >the system that has been tested.
----- >He makes all the contractors install a "bypass" around
----- >with FDC check valve and install a butterfly valve
----- >in-line to test the BFP without having to remove the
----- >check valve or it's clapper. Has anyone heard of this
----- >not being allowed in 25 or is the AHJ just making a reach?
----- >Thanks,
----- >Dewayne
----- >
----- >-----Original Message-----
----- >From: [EMAIL PROTECTED]
----- >[mailto:[EMAIL PROTECTED] On
----- >Behalf Of Steve Leyton
----- >Sent: Friday, May 30, 2008 1:58 PM
----- >To: [email protected]
----- >Subject: RE: 200 psi test for components rated 175
----- >
----- >Seeing as the backflow isn't a fire appliance, it makes
----- >sense that it's
----- >outside the scope of 13. I'm pretty sure the "full
----- >forward flow test"
----- >is a jurisdictional agency thing, i.e. NAVFAC or the
----- >serving water
----- >company. So fire officials might require it too - for
----- >peace of mind
----- >perhaps?
----- >
----- >BTW, you mitigate the clapper issue by turning the FDC
----- >body upside down.
----- >Duh.
----- >
----- >Steve Leyton
----- >Protection Design & Consulting
----- >
----- >
----- >-----Original Message-----
----- >From: [EMAIL PROTECTED]
----- >[mailto:[EMAIL PROTECTED] On
----- >Behalf Of Mark Sornsin
----- >Sent: Friday, May 30, 2008 11:33 AM
----- >To: [email protected]
----- >Subject: RE: 200 psi test for components rated 175
----- >
----- >Don't most FDCs include clappers? How do you backwards
----- >flow out an FDC with clappers? And what do you do when
----- >the system has a high demand volume - say over 500 gpm?
----- >You'll have a tough time flowing it out an FDC even
----- >without clappers.
----- >
----- >Seems it's the responsibility of the engineer of record
----- >(when they're
----- >present) to require the test outlet so the owner has a
----- >means of meeting the requirements of NFPA 25 - even if
----- >the inspectors never end up testing the backflow.
----- >
----- >When there is not an engineer of record, and a
----- >contractor is asked to design/install a system per code,
----- >I don't believe there is any language in NFPA 13 that
----- >would force a contractor to install the test outlet.
----- >
----- >Mark A. Sornsin, PE
----- >Fire Protection Engineer
----- >Ulteig Engineers, Inc.
----- >Fargo, ND
----- >701.280.8591
----- >[EMAIL PROTECTED]
----- >
----- >
----- >-----Original Message-----
----- >From: [EMAIL PROTECTED]
----- >[mailto:[EMAIL PROTECTED] On
----- >Behalf Of Gregg Key
----- >Sent: Friday, May 30, 2008 12:23 PM
----- >To: [email protected]
----- >Subject: Re: 200 psi test for components rated 175
----- >
----- >Yep, that could be the reason it is shown.
----- >
----- >Yea Matt, sorta trick question, We have installed a few
----- >wall hydrants at Military bases.
----- > Funny thing is that they do there own inspections and
----- >they don't follow NFPA 25 that requires an annual
----- >forward flow on the backflows. So the only systems in
----- >our area that do have them , are not being used.
----- > OK while we are at it, how many NFPA 25 inspectors
----- >perform the required forward flow test annually?
----- >
----- >
----- >-
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