1., from the installation technology of stainless steel multistage centrifugal pump, the suction pipe must be strictly sealed, and it can't leak or leak. Otherwise, it will destroy the vacuum degree at the inlet of the pump, reduce the water volume of the pump, and even if it doesn't get enough water. Therefore, it is necessary to do a good job of the pipe interface to ensure the quality of the pipeline connection.

2., it should be pointed out that the head and water temperature of the stainless steel multistage centrifugal pump and pipeline centrifugal pump device are different from those of the experimental conditions. If the local temperature is above 300 meters or the water temperature of the pumped water exceeds 20 degrees Celsius, the calculated value should be stopped. 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 neglected.

3. determine the height of the pump unit (that is, suction range). The height is the vertical distance between the water water pump impeller to the center line, and it allows the suction on the vacuum pump should not be confused, clarify the product suction vacuum is a vacuum pump inlet section on the value of the book or marked on the nameplate is allowed, and the water temperature in the standard atmospheric pressure, 20 degrees Celsius condition. The determination to stop the experiment. It does not think about the flow of water after the water pipe is matched. The height of the pump should be allowed to suck up the vacuum height and deduct the local value remaining after the loss of the suction pipe. It should control the altitude of the practical terrain. The height of the pump unit can not exceed the calculated value, otherwise the water pump will not be pumped up.

4., the size of the calculated value is the resistance loss head of the suction pipe. Therefore, the shortest piping layout should be adopted, and the elbow fittings should not be installed as much as possible. It is also possible to consider properly matching some larger diameter pipes to reduce the flow velocity inside the pipe.

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