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07/07/2016, 11:26 AM
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#1 |
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Registered Member
Join Date: Sep 2000
Location: Gaithersburg, MD (D.C. Metro Area)
Posts: 1,970
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Reality Check re Head Pressure in a Closed Loop?
For figuring flow rate out of a pump that is hooked into a closed loop circuit, I'm assuming head pressure would effectively be zero since the static pressure (attributable to standing water in the line) on the intake side virtually balances out the static pressure on the outlet side, which would give me maximum flow out of the pump. Is this correct?
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07/07/2016, 11:48 AM
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#2 |
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Registered Member
 
Join Date: Mar 2002
Location: Houma, LA
Posts: 4,743
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There is no head pressure in a closed loop. Head (lift) is measured from water surface of the intake to the water surface of the discharge. In a closed loop they are the same.
You will have some friction losses, probably in the range of 1-3 ft depending on your set up.
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Mark Beware the light at the end of the tunnel. Sometimes it's a train. Current Tank Info: 120, LED, Bare Bottom, SPS/LPS |
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07/07/2016, 11:56 AM
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#3 |
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Registered Member
Join Date: Sep 2000
Location: Gaithersburg, MD (D.C. Metro Area)
Posts: 1,970
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As I figured. Thanks.
Frictional loss should be minimal, since flow rate is to be very low. I'm setting up a closed loop to deliver water into a plenum under the substrate, to lift detritus up and out of the substrate. Pump will be controlled to turn on once or twice and hour for a brief period of time. Pump I'm considering is either PanWorld 10PX or BlueLine 10 HD. Pump will sit on floor beneath the tank, but if head is essentially nill, we should be good to go.
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