Submersible pump selection precautions

Submersible sewage pump is a pump that is connected with a pump and a motor and works under the liquid at the same time. Compared with the general horizontal pump or vertical sewage pump, the sewage pump has a compact structure and a small footprint. Easy installation and maintenance, large submersible pump is generally equipped with automatic coupling device can be automatically installed, installation and maintenance is quite convenient. Long continuous operation time. Submersible sewage pump because the pump and motor are coaxial, the shaft is short, and the rotating parts are light in weight, so the load on the bearing (radial) is relatively small, and the life is much longer than the general pump. There is no cavitation damage and irrigation water problems. In particular, the latter point brings great convenience to the operator. Low vibration sound, low motor temperature rise, no pollution to the environment.

Submersible sewage pumps are widely used in various fields, sewage pumps can transport liquids containing hard solids, fibers, and especially dirty, sticky and slippery liquids. Sewage pump is widely used in mining, paper making, printing and dyeing, environmental protection, oil refining, petroleum, chemical industry, farm, dyeing, wine making, food, fertilizer, coking plant, construction, marble factory, mud, quicksand, mud pond, sewage pond, dirty liquid suction thick liquid, charging and suspended matter sewage treatment.

Selection precautions：

1) According to the user needs to lift the discharge of sewage (waste) water quantity, quality and sewage tank (collection well) location, reasonably determine the flow and head of the submersible sewage pump cloud, determine the specifications of the pump.

2) According to the characteristics of sewage and wastewater, determine the type of submersible sewage pump, whether it is necessary to use cutting and grinding, whether it is to use a vortex impeller or a runner impeller, whether it is a single runner or a double runner (under the same conditions, a single runner has better anti-blocking performance than a double runner).

3) The selection should understand the average trouble-free working time, mechanical seal life, bearing rated life, motor design life, motor insulation grade, motor should be able to withstand the number of starts and stops per hour under normal conditions of use.

4) The submersible sewage pump should have a leakage protection device and overheating or overload protection device, a sealed leakage monitoring device and a reliable grounding device.

5) The outdoor sewage pool of the building can be installed with a non-closed manhole cover and no ventilation pipe. Indoor sewage ponds (collecting Wells) should be equipped with closed well covers and ventilation pipes. The material of closed well cover is cast aluminum, gray cast iron and ductile cast iron.

6) If the submersible sewage pump is used to pump corrosive wastewater, the pump body should be selected stainless steel and other corrosion resistant materials.

7) The basement submersible sewage pump should be equipped with dual power supplies.