The flow rate of the sewage pump should be selected according to the imaginary second flow rate of the living and living drainage; when the displacement is adjusted, the maximum hourly flow rate of the living and living drainage can be selected. The flow rate of the drainage pump in the fire elevator collecting pool is not less than 10L/s. The lift of the sewage pump is calculated according to the lifting height and the pipeline loss, and then a certain idle head is attached. The water head should be 0.02~0.03MPa, and the flow rate of the suction pipe and the outlet pipe should not be less than 0.7m/s and should not be greater than 2.0m/s. The flow rate of the sewage pump should be selected according to the imaginary second flow of the living and drainage.
In the public building, a spare pump should be set up in units of each living and drainage drainage pool, which should be operated interactively. Drainage in the hidden room, equipment room, garage flushing floor. If there are two or more sewage pumps, the pump may not be used. When the collecting basin cannot set up the drainage pipe, the sewage pump should have an uninterrupted power supply; when the drainage inlet pipe can be closed, the continuous power supply may not be provided, but the alarm assembly should be set. When the sewage and waste water with large impurities are introduced, the outlet pipe of the submersible sewage pump in the non-collecting pool should not be combined and discharged; when the individual wastewater is introduced, the submersible sewage pump outlet pipe that does not meet the collecting pool can be considered and consolidated according to the actual situation. . When two or more sewage pumps share a single outlet pipe, valves and check valves shall be installed on the outlet pipe of each sewage pump. When a single sewage pump drain can have a backflow, a check valve should be provided. Pressure drainage is not allowed to merge with the gravity drain in the building.
When the submersible sewage pump sputum contains large debris, the submersible sewage pump should be equipped with crushing assembly; when the sputum contains more fibrous waste water, the large-channel submersible sewage pump should be used. When the submersible sewage pump motor power is greater than 7.5kW or the outlet pipe diameter is greater than 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, it can be set. Hose mobile installation. When the sewage collection basin is drained by the submersible sewage pump, a submersible sewage pump fixed auto-coupling device shall be provided to facilitate the overhaul of the submersible sewage pump. The submersible sewage pump should be able to start and stop automatically and start and stop manually. Multiple submersible sewage pumps can be operated in parallel or in sections.
Drain pumps used in buildings include submersible sewage pumps, submerged sewage pumps, vertical sewage pumps, and self-priming sewage pumps. Because the individual space in the building is small and the displacement is not large, the submersible sewage pump and the submerged sewage 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 self-priming sewage pump are required to be separated. The earthquake foundation, self-priming water absorption, and occupying a certain garden, it is less used in the building.
