This tank in question is basically a concrete vault that will be
retrofitted as a suction tank. We are going to have to add the
suction line, fill line overflow and probably some sort of a fill
gauge. I'm assuming that there is an opening in the tank for access.
They don't want to pay the extra for a fiberglass tank with
everything already installed, so we are going to have to make this work.
My guess is that we are going to lose a total of 12-15" from the tank
height, so the effective volume will be around 8700 gallons, instead
of the 10,000 gallons rated.
At 12:50 PM 8/1/2008, you wrote:
Todd: I believe you want to use the '6 in. to bottom of elbow' option.
Once flow begins to the pump, the pump will siphon the water up the
elbow and out the tank until air can enter the pipe - which will
occur when the level in the tank drops to the 6 inch depth (where
the opening of the elbow is positioned above the floor of the tank).
As to the upper elevation of the water, I think you can assume full
depth of the tank - at least to the over-flow pipe.
Mark A. Sornsin, PE
Fire Protection Engineer
Ulteig Engineers, Inc.
[EMAIL PROTECTED]
www.ulteig.com
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Todd
Williams - FPDC
Sent: Friday, August 01, 2008 8:05 AM
To: [email protected]
Subject: effective tank volume
I am working on a project where the water supply for the facility
will be fed from concrete tank(s). The absolute volume (completely
full) of the tank is 10098 gallons. A 6" suction line with elbow &
anti-vortex plate will need to be installed. According to NFPA 22,
the face of the suction elbow has to be a minimum of 6" above the
bottom of the tank. The take-out for the elbow is 8" and the top of
the pipe will be 4" (+/-) above that. I am trying to calculate the
effective or usable volume in the tank based on what my minimum
height above the floor can be relied on for suction. Would it be the
6" to the bottom of the elbow? 14" to the center line of the suction
pipe? 18" to the top of the suction pipe? The tank is 10 feet tall,
so this could have a significant impact on available water. (BTW, I
am already assuming that the tank will only be filled 9" to 12" from
the top; would that be reasonable?)
Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
www.fpdc.com
860.535.2080
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
www.fpdc.com
860.535.2080
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