Drainage Pump Selection and Requirements

Drain pumps used in buildings include submersible sewage pumps, submerged drainage pumps, vertical sewage pumps, and horizontal sewage pumps. As the general site in the building is small and the displacement is not large, the submersible sewage pump and the submerged drainage pump can be preferentially used for the drainage pump. The submerged sewage pump is generally used in important places; the vertical sewage pump and the horizontal sewage pump are required to be separated. Earthquake foundation, self-irrigation water absorption, and occupy a certain site, it is less used in construction.

The flow rate of the drainage pump shall be selected according to the second flow rate of the life drainage design; when there is a displacement adjustment, the flow rate may be selected according to the maximum hourly discharge of the living water. The flow rate of the drainage pump in the fire elevator collection basin shall not be less than 10L/s.

The head of the drainage pump is determined according to the lifting height and the pipe loss calculation, and then a certain free head is attached. Free head should use 0.02 ~ 0.03MPa. Drain pump suction pipe and outlet pipe flow velocity should not be less than 0.7m / s, not more than 2.0m / s.

In the public building, a spare pump should be installed in each unit of the living drainage collection basin, which should be operated in an interactive manner. The drainage in the basement, equipment room and garage flushing floor may not be used for equipment pumps if there are two or more drainage pumps. When the sump cannot be equipped with an accident drain, the Water Pump shall have an uninterrupted power supply; when it is possible to close the drain, an uninterrupted power supply may not be provided, but an alarm device shall be provided.

When lifting dirt and waste water with large impurities, the outlet pipe of the submersible sewage pump in different collection tanks should not be combined and discharged; when the general wastewater is raised, the submerged sewage pump outlet pipes of different collection tanks can be considered for combined drainage according to the actual situation. .

When two or more pumps share a single outlet pipe, valves and check valves shall be installed on the outlet pipe of each pump. When a single pump drain may produce backflow, a check valve should be provided. Pressure drainage is not allowed to be combined with gravity drainage pipes in buildings. China pump valve network http://reference

When the submersible sewage pump contains large debris, the submersible sewage pump should be equipped with a smashing device; when lifting sewage containing more fiber material, a large-channel submersible sewage pump should be adopted.

When the submersible sewage pump motor power is greater than or equal to 7.5kW or the outlet pipe diameter is greater than or equal to DN100, the pump can be used to fix the auto-coupling device; when the submersible sewage pump motor power is less than 7.5kW or the outlet pipe diameter is less than DN100, can be set soft Tube mobile installation. Sewage collection tanks using submersible sewage pump drainage, the pump should be set up with a fixed auto-coupling device to facilitate the maintenance of the pump.

The drainage pump should be able to start and stop automatically and start and stop manually on site. Multiple pumps can be operated in parallel and in parallel, and they can also be put into operation in stages.