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The self-filling and water absorption of the domestic water supply pump does not require the pump to be located below the lowest water level of the storage tank. The self-filling suction pump cannot be started at the lowest water level of the storage tank. Therefore, the storage tank should set a pump-starting water level according to the self-filling requirements of the pump. When the water level is above the pump-starting water level, the pump is allowed to start. When the water level is below the pump-starting water level, the pump is not allowed to start. However, the pump already in operation should continue to run and stop automatically when the pump reaches the minimum water level of the storage tank (as long as long as long as required, it can continue to operate even below the minimum water level). Therefore, the pump top discharge hole of the horizontal centrifugal pump and the first stage (section) pump body of the suction end of the vertical multistage centrifugal pump can be placed below the lowest design water level elevation.

The self-filling and water absorption of the domestic water supply pump does not require the pump to be located below the lowest water level of the storage tank. The self-filling suction pump cannot be started at the lowest water level of the storage tank. Therefore, the storage tank should set a pump-starting water level according to the self-filling requirements of the pump. When the water level is above the pump-starting water level, the pump is allowed to start. When the water level is below the pump-starting water level, the pump is not allowed to start. However, the pump already in operation should continue to run and stop automatically when the pump reaches the minimum water level of the storage tank (as long as long as long as required, it can continue to operate even below the minimum water level). Therefore, the pump top discharge hole of the horizontal centrifugal pump and the first stage (section) pump body of the suction end of the vertical multistage centrifugal pump can be placed below the lowest design water level elevation.

In general, the water level of the water storage tank should be l/3 of the total water depth of the water storage tank.

The minimum water level of the storage tank is determined by the minimum submerged water depth of the bell mouth of the suction pipe of the pump. When the submerged water depth is insufficient, the air vortex funnel is generated, and the air on the water surface is sucked into the water pump through the vortex funnel, causing damage to the water pump. There are many factors that affect the minimum submerged water depth, and there is no exact calculation method at present. The water depth of the suction bell mouth stipulated in this article should not be less than 0.3m is determined by the fact that the water pumps used in the building water supply system are not large and the pipe diameter of the suction pipe is not more than 200mm. When the pipe diameter of the suction pipe is more than 200mm, the water depth should be deepened accordingly, which can be calculated by 0.1m.

For the case that the water depth on the suction bell mouth is less than 0.3m, the common method is to add a horizontal anti-vortex plate at the horn mouth edge. The diameter of the anti-vortex plate is twice the diameter of the horn mouth edge, I .e. the pipe diameter of the suction pipe is 1D, the diameter of the horn mouth edge is 2D, and the outer diameter of the anti-vortex plate is 4D.

The installation size requirements of other suction pipes in this article are for the normal water absorption when the pump is working and to avoid mutual interference between adjacent pumps.