Wouldn't the site fire pump and the pumper truck become pumps in
parallel? If so, the pressures are not additive. Since you need to
pressures to be added to make it work, then the parallel pumps won't do
that for you. If it is able to be a manual wet standpipe, you would
have to create a way to put the two pumps in series for the pressures to
be additive.
On 3/7/2011 11:09 AM, Ronl.Fletcher wrote:
The loophole is if "the fire department can pump supplemental water" (3.8.1.4),
whatever that is. I have never been able to figure out how to do that, have you?
Ron Fletcher
Aero Automatic
Phoenix, AZ
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Greg McGahan
Sent: Monday, March 07, 2011 10:53 AM
To: [email protected]
Subject: Re: Manual vs Auto SP
wait! Let's keep it very simple here:
Can you calculate a SP system that utilizes both a fixed Fire pump that feed
sprinklers and SP's and also use the FDC with the accompanying Fire Pumper
Truck and adajent fire hydrant as a SOURCE?
I think the answer is a resounding NO but I am willing to be wrong if there
is a loophole I am unfamiliar with...
Thanks,
Greg
On Mon, Mar 7, 2011 at 11:48 AM, George Church<[email protected]>wrote:
Is the FDC connected to pump suction?
If its not, and the pump is producing 150 PSI discharge, and the FD hits
the FDC with 150 (connected to the discharge side of the fire pump), then
you have 150 PSI, not 300, going to the system.
You can graph the combination of dissimilar supplies by graphing both and
adding the flows at same pressures.
Safe to assume the large Fed entity has an FPE as EOR? Cause the FDC isn't
exactly an "automatic" water supply, so the ice is thin, even if its up by
the FroBros.
George Church
Rowe Sprinkler Systems, Inc.
PO Box 407, Middleburg, PA 17842
877-324-ROWE 570-837-6335 fax
[email protected]
-----Original Message-----
From: [email protected] [mailto:
[email protected]] On Behalf Of Greg McGahan
Sent: Monday, March 07, 2011 12:29 PM
To: [email protected]
Subject: Manual vs Auto SP
What do you do with an existing SP system that far exceed the pressure
requirement when performing calcs...nearly 200 psi over the curve due to the
fact that you are flowing 1,250 gpm through 4" pipe.
The owner wants to classify the system as MANUAL and utilize a FD to feed
the system but leave the fire pump connected. The system still does not
work when using only the FDC feeding the system due to the fact that the FD
only plans to utilize 2 each 2-1/2" hose to connect to the FDC.
The owner - a large Federal Entity - wants to make this a HYBRID system
utilizing the Fire Pump and the FDC combined. I can't find a correct way to
do this...thoughts?
Greg
--
Greg McGahan
Living Water Fire Protection, LLC
1160 McKenzie Road
Cantonment, FL 32533
850-937-1850
fax 850-937-1852
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