Pipeline centrifugal pump installation tips
Pipeline centrifugal pumps (that is, ISG vertical centrifugal pumps, ISW horizontal centrifugal pumps, some single-stage XBD fire pumps are also such pipeline centrifugal pumps, and their installation methods are roughly the same) are widely used in life, how Correct installation is the key to long-term use. Correct installation of in-line centrifugal pumps can not only increase the service life of the pump, but also better meet the requirements! The key to the installation technology of in-line centrifugal pumps is to determine the installation height of the pump (ie suction). This height refers to the vertical distance from the water surface of the water source to the center line of the pump impeller. It should not be confused with the allowable vacuum height. The allowable vacuum height indicated on the pump product manual or nameplate refers to the vacuum value on the section of the water inlet of the pump, and It is measured under 1 standard atmosphere pressure and water temperature of 20 degrees Celsius. It does not consider the water flow after the suction pipe is installed. The installation height of the water pump should be the value of the remaining part of the value after the vacuum height is allowed to suck up and the loss of the suction pipe is deducted. It must overcome the actual topographic water absorption height.
The installation height of the pump cannot exceed the calculated value, otherwise, the pump will not be able to pump water. The value that affects the calculation is the resistance loss head of the suction pipe. Therefore, it is advisable to adopt the shortest pipeline layout and install as few fittings as elbows. It is also possible to consider appropriately matching larger diameter water pipes to reduce the flow velocity in the pipe. It should be pointed out that when the elevation and water temperature of the pipeline centrifugal pump installation site are different from the test conditions, if the local altitude is above 300 meters or the temperature of the pumped water exceeds 20 degrees Celsius, the calculated value must be corrected. That is, the atmospheric pressure at different altitudes and the saturated steam pressure when the water temperature is higher than 20 degrees Celsius. However, when the water temperature is below 20 degrees Celsius, the saturated steam pressure is negligible. From the perspective of pipeline installation technology, the suction pipeline must have strict tightness and must not leak air or water, otherwise the vacuum at the water inlet of the pump will be damaged, and the water output of the pump will be reduced. In severe cases, it will not even be able to pump water. Therefore, it is necessary to do a good job in the interface of the pipeline carefully to ensure the construction quality of the pipeline connection.
