Bobby,
Do these pumps have a churn pressure (when combined with the public
supply) greater than 175 psi? That goes back to my original post on
this thread.
The situation I have is that the main relief valve was replaced with
a Cla Valve (called the contractor to confirm) which discharges back
into the suction line. We can't be sure if this is operating properly
or is even set right.This entire pump arrangement is going to be
reviewed, repaired and re-designed. The valve is actually (I think) a
minor part of the problem. The initial hydrant test on the yard loop
yielded 630 gpm at 30 psi from a 1500 at 125 pump and steam was
shooting out of the engine.
At 02:03 PM 3/14/2007, you wrote:
Todd:
A lot of the distribution facilities in my area use ESFRs and a booster
fire pump connected to a fair to good water supply. The most common
installation incorporates a main relief valve in the fire pump discharge
piping.
With the State adopting the NFPA standards which move clearly away from
this arrangement, I have communicated with other contractors and the
most common and least expensive solution is to install a PRV (usually an
8") after the fire pumps discharge gate valve.
Is this the "nightmare" arrangement you are speaking of?
Bobby McCullough
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Todd
Williams - work
Sent: Wednesday, March 14, 2007 1:39 PM
To: [email protected]
Subject: RE: pump tricks
I see what you are getting at. I haven't heard of very many relief
valve problems on systems that were maintained (unlike the 26 year
old diesel pump with 158 hours on the engine) in this part of the
world. My situation may be a Cla Valve, I don't have the specifics
here, except to say it is a mess.
At 01:23 PM 3/14/2007, you wrote:
>We have never used one for an entire facility unless we could do it
with
>2-1/" prv. The relief valves really can create a lot of problems and we
have
>seen them not work at all and no one know for long periods of time.
>
>You can get 500 gpm out of 2-1/2" PRV so we try to stay with them.
>
>Are you talking about a PRV or a Clay Valve being unreliable?
>
>PRV's usually relax over time. That is why the requirement is to limit
the
>pressure to 165 psi on the system side of the valve.
>
>
>Living Water Fire Protection, LLC
>1160 McKenzie Road
>Cantonment, FL 32533
>850-937-1850
>Fax: 850-937-1852
>
>
>-----Original Message-----
>From: [EMAIL PROTECTED]
>[mailto:[EMAIL PROTECTED] On Behalf Of Todd
Williams
>- work
>Sent: Wednesday, March 14, 2007 12:19 PM
>To: [email protected]
>Subject: RE: pump tricks
>
>
> >Greg McGahan wrote...
> >
> >We do not use Relief valves any more. We rely on the proper rated
fittings
> >and Pressure Reducing Valves. The relief valves we have seen do not
operate
> >quickly enough to save the system from being exposed to higher
pressure and
> >they discharge so much water that they destroy property.
> >
> >
>
>Interesting. I am working on a project where the relief valve was
>removed and replaced with a PRV. The PRV has become such a nightmare
>since we can't reliably set it and just don't trust it to work right,
>that we are replacing it with a standard relief valve. What is you
>experience with PRVs over time? What kind of maintenance are you
>doing with them?
>
>
>Todd G. Williams, PE
>Fire Protection Design/Consulting
>Stonington, Connecticut
>860-535-2080
>www.fpdc.com
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
860-535-2080
www.fpdc.com
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