Hi, tech. guys! I have Well pump doubt?
June 27th, 2009 | 
Author:
We have one well pump…?
Hi to Tech. guys. We have one well pump installed newly to pump out
sea water near shore. it's real capacity is 100 Cu. M / Hour and 80 M head. Right now we put the pump in 12 inch casing, in depth of 36 M.
I am getting 112 Cu. M per hour. The problem is , This well is not enough to give this much water continously. I want to regulate by closing the discharge valve but the Current of motor is increasing.
i need only 100 Cu. M. When I reduce flow, why this current is increasing? I could not understand it. This pump is originally 30 Kw or we say 40 Hp pump. Initially the current is around 56 A with 415 Volt , 3 ph but after closing the valve to 15%(85% valve open) the current is 60 A. Please any one can explain it? V. Kannan
When you produce back pressure or a head against the pump it works harder due to restriction. You would need to install a variable speed reostat to adjust flow . Is your prime mover electric or diesel? If you install reostat you can adjust flow with discharge valve wide open.
Posted in 12 volt Water Pumps
When you produce back pressure or a head against the pump it works harder due to restriction. You would need to install a variable speed reostat to adjust flow . Is your prime mover electric or diesel? If you install reostat you can adjust flow with discharge valve wide open.
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I have been a plant operator for 8 yrs.
you are restricting the flow, and the pump motor is trying to push the same amount of water through the pipe, so the load is going up, which increases the current.
You need a 3 phase speed controller to control the speed of the motor. Alternatively, you could use a float switch to shut off the motor when the water gets too low.
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Another solution would be a flow relief valve, which you would open and discard excess flow, with no increase in current draw.
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