The key installation technology of centrifugal pump
The key to the installation of the pipe centrifugal pump is to determine the height of the installation of the centrifugal pump, that is, the suction range. The height is the vertical distance from the water surface to the center line of the centrifugal pump impeller, it allows suction confused on a high vacuum, high vacuum suction on the vacuum pump inlet section refers to the value of the pump product specifications or nameplate allowed, and in 1 the standard atmospheric pressure, water temperature 20 degrees Celsius next, the determination to test. It does not take into account the water flow condition after the water pipe is matched. The installation height of the pump should be allowed to suck up the vacuum height and deduct the remaining part after the loss of the suction pipe. It should overcome the actual height of the terrain. The height of the installation of the pump can not exceed the calculated value, otherwise the centrifugal pump will not be pumped up. In addition, the influence of the calculated value is the resistance loss head of the suction pipe. Therefore, the shortest piping layout should be adopted, and the fittings such as elbow should not be installed as much as possible. It is also possible to consider that a larger diameter pipe should be properly fitted to reduce the flow velocity inside the pipe.
It should be pointed out that the elevation and water temperature at the installation site of the centrifugal pump are different from the experimental conditions. For example, if the local temperature is above 300 meters or the water temperature of the pumped water is more than 20 degrees Celsius, the calculated value should be corrected. That is, the atmospheric pressure at different elevations and the saturated vapor pressure at a temperature above 20 degrees Celsius. However, when the water temperature is below 20 degrees Celsius, the pressure of saturated steam can be ignored.
From the pipe installation technology, the suction pipe must be strictly sealed, and it can't leak or leak. Otherwise, it will destroy the vacuum degree of the inlet of the centrifugal pump, reduce the water volume of the centrifugal pump, and even even get no water. Therefore, it is necessary to do a good job of the pipe interface to ensure the quality of the pipeline connection.
Key technology for installation of pipe centrifugal pump
Two. Calculation of the height of the installation of a centrifugal pump by Hg
The maximum vacuum height Hs is allowed to mean the maximum vacuum at the inlet pressure of the pump P1.
The actual allowable suction vacuum height Hs value is not the calculated value of the formula, but the value measured by the pump manufacturer. This value is attached to the pump sample for users to check. It should be noted that the Hs value given in the pump sample is the working medium with clear water as the working medium. The operating conditions are 20 C and 1.013 when the pressure is 105Pa. When the operation conditions and working media are different, it needs to be converted.
1 the water is transported, but the operating conditions are different from the experimental conditions, which can be converted to the next type.
Hs1=Hs+Ha-10.33 --0.24
2 when the liquid conveying other transported liquid and the villain conditions and experimental conditions are not the same, there are two steps: the first step in the conversion formula will be found in the Hs1 samples by the pump; second step according to the type of Hs1 converted to H s
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