The drainage pumps used in buildings include submersible sewage pumps, submerged drainage pumps, vertical sewage pumps and horizontal sewage pumps. Because 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 in 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. The earthquake foundation, self-priming water absorption, and occupying a certain site, it is less used in the building.
The flow rate of the drainage pump should be selected according to the second flow rate of the domestic drainage design; when the displacement is adjusted, it can be selected according to the flow rate of the domestic drainage. The flow rate of the drainage pump in the fire elevator collecting pool is not less than 10L/s. The lift of the drain pump is calculated according to the height of the lift and the loss of the pipeline, and then a certain head is attached. The water head should be 0.02 ~ 0.03MPa. The flow rate of the suction pipe and the outlet pipe of the drain pump should not be less than 0.7m/s, and should not be greater than 2.0m/s.
In the public building, a spare pump should be set up in each living drainage basin as a unit, and it should be operated interactively. Drainage in the basement, equipment room, and flushing floor. If there are two or more drainage pumps, the pump may not be used. When the collecting basin cannot set up an accident drain, the pump should have an uninterrupted power supply; when the drain inlet can be closed, there is no need for uninterrupted power supply, but the device should be installed.
When lifting sewage and wastewater with large impurities, the outlet pipes of submersible sewage pumps in different collection pools should not be combined and discharged; when upgrading general wastewater, the discharge pipes of submersible sewage pumps of different collection basins can be considered and combined according to actual conditions. .
When two or more pumps share a single outlet, valves and check valves should be installed on each pump outlet. When a single pump drain may cause backflow, a check valve shall be provided. It is not allowed to combine the pressure drainage with the gravity drain in the building. When the submersible sewage pump is lifted to contain large debris, the submersible sewage pump should be equipped with a crushing device; when lifting more sewage containing 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 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, soft can be set. Tube mobile installation. When the sewage collection basin is drained by the submersible sewage pump, a water pump fixed auto-coupling device shall be provided to facilitate the inspection of the water pump. The drain pump should be able to start and stop automatically and manually start and stop on site. Multiple pumps can be operated in parallel or in sections.