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Question:

What are submersible water pumps?

Give me a general intro. about submersible water pumps.

Answer:

A water pump can have all the works above the water, pulling by suction and pushed by atmospheric pressure to a maximum of about 33 feet. Or it can have the motor above water and the lifting mechanism below with a long rod connecting (like an oil well with the donkey engine on the surface), but a bunch of weight and friction. Or it can be waterproofed and the motor and pump lowered down the drilled shaft on a plastic pipe with an electrical cord along side and push the water up. The last is a submersable. Similarly sump pumps and recirculating pumps where the cord, motor, and pump are under the liquid.
they are sealed so that all electricl parts are water proofed
It means the pump goes under water.
Submersible pumps are among the pumps used for pumping liquids from a sump or reservoir at low level. The non-submersible pumps are placed above the the liquid level. Submersible pumps are immersed in the liquid in the sump. The submersible pumps have positive suction head while the submersible pumps have negative suction head.
This usually refers to the pump and electric motor, where the motor is sealed so that they can be submersed. The problem with many types of pump is that they are not self priming so the easy solution is to put it under the water. There are pumps where the motor is connected by a long shaft so that it remains out of the water while the pump is submersed but I'm not sure this is really classified as a submersed pump.

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