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Does it need to be drained by gravity? Can you just connect a little peristaltic or small inline circulator pump to force it to drain at the desired rate?
If it needs to be gravity drained, then you will have to figure out how fast the water naturally drains at the lowest level. Then find a valve that will keep it draining at that rate at higher water levels. With gravity drains, you can always find something to decrease the flow of water, but not something to increase it. So if you can use a pump, it might be the easiest option. Regards.
Michael Ross
Program Educator
Connecticut Science Center
250 Columbus Boulevard
Hartford, CT 06103
Direct: 860.520.2104
www.CTScienceCenter.org | (860) SCIENCE
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-----Original Message-----
From: Informal Science Education Network [mailto:[log in to unmask]] On Behalf Of Peter Ford
Sent: Thursday, August 19, 2010 11:08 AM
To: [log in to unmask]
Subject: How to drain a tank of water at a constant rate?
ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related institutions.
*****************************************************************************
Hi all,
Here's the technical dilemma that I'm trying to solve.
I want to drain a tank of water, from the bottom, at the same rate
regardless of how much water is in the tank. So whether there is 5" or
20" of water in the tank it will drain at ˝ gal a minute (values are
somewhat arbitrary for this example).
So how can I do this? I've tested Pressure-Compensating Orifice from
McMaster but that didn't work (I think the pressure is to low for them
to work). I have seen devices that automatically regulate but they are
for larger industrial systems (and cost a lot), or they are for higher
pressure systems.
For more specificity it's a 11" diameter tank and I'm draining through a
1" valve. The water height varies between 4" to 30"
Any solutions, or ideas, would be appreciated.
Thank you in advance.
-Peter
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