The choice of drainage pumps and requirements

Building use drainage pumps are submersible sewage pump, liquid discharge pump, vertical sewage pump and horizontal sewage pump, etc. Because within the building area is lesser, general displacement is not big, give priority to use diving sewage pump and drainage pump liquid discharge pumps, including submerged sewage pump is in commonly used in important places; Vertical and horizontal sewage pumps pump set isolation requirements, since the irrigation water, and take up a certain field, so the less use in the building.

Drainage pump flow should be according to the second life drainage design flow of the selected; When a displacement adjustment, drainage maximum hours flow selected according to life. Fire elevator collecting basin drainage pump flow within not less than 10 l/s.

Drainage pump lift according to hoisting height, piping loss calculation is determined, then add some free head. Free head should be 0.02 ~ 0.03 MPa. Drainage pump suction pipe and outlet pipe flow velocity should not be less than 0.7 m/s, and should not be more than 2.0 m/s.

Public buildings should be in each life drain collecting basin as a unit set up a backup pump, at ordinary times should be interactive operation. Basement, equipment room, garage flushing the drainage of the ground, such as when there are more than two and two drainage pumps don't pump equipment. When collecting basin can't set accident drainage pipe, water pump should be uninterrupted power supply; When can close drainage inlet pipe, not for uninterruptible power supply, but should be set up alarm device.

As ascension with larger impurities of sewage, waste water, the different set inside the pool diving sewage pump outlet pipe should not be combined discharge; When raising the waste water, according to actual situation consider different collection pool diving sewage pump outlet pipe combined discharge.

Two or more than two Shared a water pump outlet pipe, shall be installed on each pump outlet pipe valve and check valve. Single pump drainage could produce flow backward, should set the check valve. Don't allow pressure drainage clearance and architecture in gravity drainage consolidation.

When diving sewage pump ascending containing large pieces of debris, appropriate of diving sewage pump with a crushing device; When ascending contains more fiber content of sewage, appropriate USES thoroughfare diving sewage pump.

When diving sewage pump motor power is greater than or equal to 7.5 kW or outlet pipe diameter greater than or equal to the DN100, water pump fixed automatic coupling device can be used; When diving sewage pump motor power is less than 7.5 kW or outlet diameter less than DN100, can install a hose mobile. Wastewater collection pool with diving sewage pump drainage, should set the pump fixed automatic coupling device, convenient pump maintenance.

Drainage pump should be able to automatic start-stop and field manual start-stop. Pumps can run in parallel alternating more, also can be segmented in operation.