The flow rate of the drainage pump should be selected according to the design of the second flow of the living drainage

1, when the drainage amount is adjusted, the flow rate can be selected according to the maximum hourly discharge of the living drainage. The flow rate of the drainage pump in the pool of fire elevator is not less than 10L/s. The lift of the drainage pump is determined according to the height of the lifting and the calculation of the loss of the pipe, and a certain free head is added. The free head should be 0.02 ~ 0.03MPa. The flow rate of water suction pipe and outlet pipe should not be less than 0.7m/s, and it should not be greater than 2.0m/s. In public buildings, a spare pump should be set up in each water and drainage pool for the unit. Underground water, equipment room, garage to wash the ground drainage, if there are two or more than two pumps can not be used to pump equipment.

2. When an accident drainage pipe can not be set up in a pool, the pump should have an uninterrupted power supply.

3, when the drainage pipe can be closed, there is no uninterrupted power supply, but the alarm device should be set up.

4, when the pollution and waste water with large impurities are raised, the outlet pipes of the submersible sewage pump in different pool should not be merged and discharged.

5. When the general waste water is raised, the water discharge pump of the submersible sewage pump in different pool can be considered in accordance with the actual situation. When a water pump is shared by two or more pumps or more, valves and check valves should be installed on the outlet pipes of each pump. When a single pump drainage is likely to produce inverted irrigation, a check valve should be set. The pressure drainage is not allowed to be discharged from the gravity drainage pipe in the building.

6, when the submersible sewage pump is lifting large lump, the submersible sewage pump should have a smashing device. When upgrading the sewage containing more fiber, the large channel submersible sewage pump should be used.

7, when the motor power is greater than or equal to 7.5kW or the outlet diameter is greater than or equal to DN100, the pump can be fixed and self coupled device. 8, when the power of the submersible sewage pump motor is less than 7.5kW or the outlet pipe diameter is less than DN100, a hose mobile installation can be installed. When the sewage water pool is drained by the submersible sewage pump, a pump fixed auto coupling device should be set to facilitate the maintenance of the water pump. The drainage pump should be able to start and stop automatically and the field manual start and stop. Many pumps can be operated alternatively in parallel, and can also be put into operation in segments.

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