vacuum priming for submersible turbine pump
vacuum priming for submersible turbine pump
(OP)
My client wants to replace a pair of vertical turbine pumps with submersible turbine pumps to reduce noise complaints from nearby residents. The vertical turbines are installed in cans connected to the nearby lake, which varies in level. With a submersible, the intake will be higher than the vertical turbine intake by the length of the submersible motor.
My question: Is vacuum priming the pump can a viable solution to lift the lake water to the submersible pump intake during low lake level conditions?
My question: Is vacuum priming the pump can a viable solution to lift the lake water to the submersible pump intake during low lake level conditions?





RE: vacuum priming for submersible turbine pump
RE: vacuum priming for submersible turbine pump
RE: vacuum priming for submersible turbine pump
RE: vacuum priming for submersible turbine pump
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RE: vacuum priming for submersible turbine pump
RE: vacuum priming for submersible turbine pump
In either case you have to make sure you seal the motor leads as they exit the pump can. In the case of the pumps mounted vertically with a vacuum reprime, it simply won't work if you're drawing air across the motor lead. In the case of the pumps mounted horizontally, you want to keep the water from leaking out of the can across the leads.
There are several methods for sealing the motor leads. You can run the leads through a stub-out piece of pipe and fill this with resin (make sure the outer cable insulation is removed leaving the individual insulated wires, water will leak between the outer insulation and the inner).OZ Gedney offers a conduit sealing busing which I believe is rated to about 100 psi (good for most flooded applications)ref:http://www.o-zgedney.com/PDF/R1thru24.pdf page RA17. For applications where suction pressure exceeds 100 psi we've used a marine connector which screws into an NPT connection in the pump can (sorry I can't remember the manufacturer). The motor cable is spliced inside of the can.
Dickon17 is correct about motor cooling. Submersible motors run hot. They are required to have a minimum velocity of water flowing over them. The manufacturer's IO&M will specify this value. A link to Franklin's follows for reference: htt
I would not recommend using the vacuum reprime / vertical orientation design. It adds a level of complexity that makes the design very unreliable.
RE: vacuum priming for submersible turbine pump