Has a propeller-type of impeller running in a casing. The pressure is developed by the flow of liquid over the blades of impeller.
Submersible Pumps or Electric Submersible Pump (ESP) is a pump that may be submerged in a liquid or fluid. The motor is hermetically sealed and is encapsulated in the body of the pump casing. This ensures that the motor will remain functional even when it is submerged in liquid, usually water, storm water or sewage. Submersible dry pit pumps can be installed without being submerged, unlike wet well submersible pump installations dry well stations are not flooded with water or sewage. They are typically built below ground level, the dry well pumping station is most vulnerable to flooding, thus the use of a submersible pump to protect the motor from liquids. The biggest problem becomes how to keep the submersible pump motor cooled, the popular way is with a cooling jacket. Other names for submersible pumps may include sump pump or sewage pump.
Submersible pumps vary in size and capacity depending on the conditions, required GPM discharge, head/lift condition, as well as friction losses from distance of piping, valves and fittings. Proper sizing is most important. Some submersible pumps are automatic incorporating a float switch built into the pump itself, larger systems usually relay on a control panel and float switches to operate one or more pumps.
