The drainage pump used in the building has a submersible sewage pump, a submerged drainage pump, a vertical sewage pump and a horizontal sewage pump. Because the general space in the building is small, the displacement is small, drainage pump can be preferential use of submersible sewage pump and submerged pump, in which the sewage pump is generally used in important places; vertical sewage pump and horizontal sewage pump need to set the base of isolation, self-priming suction water, and occupy a certain site, so less use in the building.

Discharge pump flow should be based on the life of drainage design second flow selection; when there is a displacement adjustment, the maximum hourly flow can be selected. The water pump flow in the fire elevator set is not less than 10l/s.

The head of the drain pump is determined by the height of lifting and the calculation of the pipeline loss, and then the free water is added. The free head should adopt 0.02~0.03MPa. Drain pump suction pipe and outlet flow rate 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 for each draining water pool in order to operate interactively. Basement, equipment room, garage flushing the ground drainage, if there are two units and more than two pumps pump equipment. When the pool is unable to set the accident drainage pipe, the pump should have uninterrupted power supply, when the drainage pipe can be closed, the power supply can be provided, but the alarm device should be set up.

When raising the pollution and waste water with the larger impurities, the submersible sewage pump outlet pipe in different catchments should not be combined and discharged; when the general wastewater is upgraded, it can be considered that the water outlet pipe of the submersible sewage pump with different catchment is discharged according to the actual situation.

When two or more pumps share a pipe outlet, the valve and check valve shall be installed on each pump outlet pipe. Single pump drainage may be generated when the intrusion, should be set check valve. The pressure drain is not allowed to be combined with the gravity drainage pipe in the building.

When the submersible sewage pump to enhance the inclusion of large debris, submersible sewage pump should be equipped with a crushing device, when the promotion contains more fibrous sewage, it is advisable to use a large channel submersible sewage pump.

When the submersible sewage pump motor power is greater than or equal to 7.5kW or outlet pipe diameter is greater than or equal to DN100, can be used pump fixed self-coupling device; When the submersible sewage electric pump motor power is less than 7.5kW or outlet pipe diameter is less than DN100, can be installed hose mobile installation. Sewage collection tank using submersible sewage pump drainage, should set up a water pump fixed self-coupling device to facilitate the maintenance of water pumps.

The drain pump shall be able to start and stop automatically and on-site manually. Multiple pumps can be operated alternately in parallel, or they can be put into operation in sections.