How to use submersible sewage pump?

The drainage pumps used in buildings include submersible sewage pumps, submerged sewage pumps, vertical sewage pumps and horizontal sewage pumps. Due to the generally small site in the building and the small displacement, submersible sewage pumps and submerged sewage pumps can be preferred for drainage pumps. Among them, submerged sewage pumps are generally used in important places; vertical sewage pumps and horizontal sewage pumps require isolation Seismic foundation, self-irrigating water absorption, and occupying a certain amount of space, so it is rarely used in buildings.

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

1. When there is drainage adjustment, it can be selected according to the larger hourly flow of domestic drainage. The flow rate of the drainage pump in the fire elevator sump is not less than 10L/s. The head of the drainage pump is calculated and determined according to the elevated height and pipeline loss, and then a certain free head is added. The free water 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 spare pump should be set up for each domestic drainage sump, and it should be operated alternately at ordinary times. For the drainage of the basement, equipment room, and garage to flush the ground, if there are two or more drainage pumps, there is no need to install a pump.

2. When the sump cannot be equipped with an emergency drainage pipe, the water pump should have uninterrupted power supply;

3. When the drainage and water inlet pipes can be closed, uninterrupted power supply may not be provided, but an alarm device shall be provided.

4. When raising sewage and waste water with large impurities, the outlet pipes of submersible sewage pumps in different sumps should not be discharged together.

5. When increasing the general waste water, the submersible sewage pump outlet pipes of different sumps can be combined and discharged according to the actual situation. When two or more water pumps share one outlet pipe, valves and check valves should be installed on the outlet pipe of each pump. When the drainage of a single water pump may cause backflow, a check valve should be installed. It is not allowed to combine the pressure drain and the gravity drain in the building.

6. When the submersible sewage pump contains large debris, the submersible sewage pump should be equipped with a crushing device; when the sewage containing more fibers is raised, a large channel submersible sewage pump should be used.

7. When the motor power is greater than or equal to 7.5kW or the diameter of the water outlet is greater than or equal to DN100, the water pump can be used to fix the self-coupling device;

8. When the motor power of the submersible sewage pump is less than 7.5kW or the diameter of the water outlet is less than DN100, the flexible hose can be installed. When the submersible sewage pump is used for drainage of the sewage collection tank, a fixed self-coupling device for the water pump should be installed to facilitate the maintenance of the water pump. The drainage pump should be able to start and stop automatically and manually start and stop on site. Multiple water pumps can be operated in parallel and alternately, and can also be put into operation in sections.