Todd,
When you think about it, what you accomplish by having two small tanks
rather than one larger one is to increase the likelihood that you'll
have some water, but to decrease the liklihood that you'll have enough,
and paying extra cost of an additional tank, piping, and valves to do
so. Statistically, the probability of the pump not running or a valve
being shut or a main breaking is significantly less than a tank being
out of service. If you want to increase reliability, go with two pumps
and one tank.
Joe
Todd Williams - work wrote:
My reasoning for the suction arrangement I proposed was that if one
tank needs to be taken out of service, then the second tank could
provide some protection, even if not for the duration. Am I
over-thinking this? This is the only source for sprinkler water at
this location.
At 06:10 PM 4/4/2007, you wrote:
Hello Cliff,
Draw from 1 tank, common line to 2nd tank, return to 2nd tank. No
valves in the common line.
Wednesday, April 4, 2007, 5:10:44 PM, you wrote:
> You could split the discharge after the flow meter and pipe a
return to both
> tanks. If you kept the piping fairly symmetrical it should balance
out.
> Just a thought.
> Cliff
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Todd
Williams
> - work
> Sent: Wednesday, April 04, 2007 4:02 PM
> To: [email protected]
> Subject: Twin tanks and flow meters
> I am working on a project with a 250 gpm fire pump taking suction
> from two 5000 gallon tanks. The suction piping for each tank is
> connected to a common suction line. The levels in the two tanks will
> be equal as the common pipe will keep that balance. The owner wants a
> flow meter for annual testing and to have it pipe back into the tanks
> so as not to waste the water. This raised two questions: (1) If you
> piped the discharge back into one tank, would a serious enough
> imbalance be created in the water levels of the two tanks to create a
> problem such as the other tank being drawn to empty? If so, how would
> you address it? If this was a static situation, it would not be an
> issue, but under suction, the balancing through the suction line
> would not occur. (2) I'm assuming that the discharge pipe for the
> flow meter would need to be piped below the water level to keep help
> keep air out of the system. Any good criteria for this? I was
> thinking the bottom of the pipe would need to be at the 1/3 level,
> but that is little more than a guess.
> Todd G. Williams, PE
> Fire Protection Design/Consulting
> Stonington, Connecticut
> 860-535-2080
> www.fpdc.com
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--
Best regards,
Charles mailto:[EMAIL PROTECTED]
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
860-535-2080
www.fpdc.com
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