Urban Water Supply In ChinaUrban Water Supply
1. Principle of water supply requirements
The operating parameter of pump station is as below:
The inlet level of water tank is controlled at 3-10 meters.
Water supply pressure is controlled at 0.3Mpa-0.5Mpa.
To guarantee the technical requirements, two types of axially split case pump S350B75 and S250A65 can meet its demand which the designed flow is 72-20106m³/h And the head is 11-140 meters. The maximum inlet pressure is 0.6Mpa.
2. Principal of equipped the pump
2.1 The maximum reverse speed of the pump should not exceed 1.2 times of the rated speed. The duration of the rated speed should not exceed 2 minutes. The pump unit should be equipped with spare pumps which can automatically switch alternately for backups.
2.2 The main pump includes working pump and backup pump, but does not include flow regulating pump. The total number of pumps should not exceed ten. The single pump flow rate of the flow regulating pump can be selected as 1/5 or 1/10 of the main pump flow.
According to the equipping principal, we equipped 3 sets of S350B75 and 2 sets of S250A65.
It is a urgent project assigned by the government as our people in Guiyang county depend on domestic water. There will be no water if it was not for ZB. Our pump station is in stable operation and we are really grateful.