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The drainage pumps used in the building include submersible sewage pumps, submerged sewage pumps, vertical sewage pumps and horizontal sewage pumps. Since the general site in the building is small and the drainage volume is not large, the sewage pump can be given priority to use the sewage submersible pump and the submerged sewage pump. The submerged sewage pump is generally used in important places; the vertical sewage pump and the horizontal sewage pump require isolation It is seldom used in construction because it has earthquake foundation, self-irrigation water absorption, and takes up a certain area.
The flow rate of the drainage pump should be selected according to the second flow rate of the life drainage design; when the drainage volume is adjusted, it can be selected according to the maximum hourly flow rate of the life drainage. The flow of the drainage pump in the fire elevator sump is not less than 10L/s. The head of the drainage pump is determined according to the lifting height and pipeline loss, and then a certain free head is added. The free head should be 0.02～0.03MPa. The flow velocity of the suction pipe and outlet pipe of the drainage pump should not be less than 0.7m/s, and should not be greater than 2.0m/s.
In public buildings, a standby pump should be set up with each living drainage catchment as a unit, and it should be operated alternately at ordinary times. If there are two or more drainage pumps for the drainage of the basement, equipment room, and garage, the equipment does not need to be used. When the sump cannot be equipped with an accident drain, the pump should have an uninterrupted power supply; when the drain and inlet pipe can be closed, the uninterrupted power supply may not be provided, but an alarm device should be installed.
When lifting sewage and waste water with large impurities, the submersible sewage pump outlet pipes in different sumps should not be combined for discharge; when lifting general wastewater, consider the submersible sewage pump outlet pipes of different sumps for combined discharge according to the actual situation .
When two or more water pumps share one outlet pipe, a valve and a check valve should be installed on the outlet pipe of each pump. When a single water pump discharge may cause backflow, a check valve should be provided. It is not allowed to merge the pressure drainage port with the gravity drainage pipe in the building.
When the submersible sewage pump lift contains large debris, the submersible sewage pump should be equipped with a crushing device; when the sewage contains more fibrous materials, a large channel submersible sewage pump should be used.
When the submersible sewage pump motor power is greater than or equal to 7.5kW or the water outlet pipe diameter is greater than or equal to DN100, the water pump fixed autocoupling device can be used; when the submersible sewage pump motor power is less than 7.5kW or the water outlet pipe diameter is less than DN100, the soft Pipe mobile installation. When a submersible sewage pump is used to drain the sewage collection tank, a submersible pump fixed auto-coupling device should be installed to facilitate the maintenance of the pump.