A submersible pump or clock pump is a pump that is completely submerged in the liquid to be pumped. The drive can be electric as with a centrifugal pump (the so-called basement pump with which cellars and crawl spaced are pumped out), hydraulically or electromechanically as with a piston pump (for example, the pump in an oil field connected to a jackhammer).
Armenian oil delivery system engineer and inventor Armais Arutunoff successfully installed the first submersible oil pump in an oil field in 1928.
Because the pump is always at the bottom, it can pump the liquid up to any desired height within the limitations of the power of the drive and the pressure that the pump and the pressure pipe connected to it can handle.
An important limitation to submersible irrigation pumps is the cooling of the engine. The most well-known are air-cooled by means of a fan. This technique can not be used with submersible motors. It will in many cased be the pumped liquid that cools the engine. Therefore, the pump can only start when it is completely submerged and that the operating system for interval operation is specified in the operating instructions.
This type of pumps is mainly used for: lowering groundwater, pumping up groundwater for drinking water or fire extinguishing water, pumping out drainage water, effluent and waste water.
The basement pump known to many people usually has a switch which is operated by a float and which prevents the pump from running dry. A new feature in certain basement pumps is the pumping down to mop level, this type of cellar pump is sometimes referred to as flat suction pumps.
An electric submersible pump is watertight and can not be repaired by a hobbyist in connection with safety. You will always need a professional repairman.