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The key to the installation technology of centrifugal heat transfer oil pump is to determine the installation height of the oil pump (ie self-priming). The allowable vacuum height Hs of the centrifugal oil pump refers to the allowable vacuum degree of the pressure p1 at the pump inlet. The actual allowable suction vacuum height Hs value of centrifugal pump oil is not a value calculated according to the formula, but a value determined experimentally 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 value when clean water is used as the working medium, and the operating condition is 20℃ and the pressure is 1.013×105Pa. When the operating conditions and working medium are different, conversion is required.
This height refers to the vertical distance from the medium surface to the center line of the impeller of the oil pump. It should not be confused with the allowable suction vacuum height. The allowable suction vacuum height indicated on the oil pump product manual or nameplate refers to the vacuum value on the water inlet section of the oil 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 oil suction pipeline is installed. The installation height of the centrifugal oil pump should be the value that is left after the vacuum height is allowed to suck up and the loss head of the suction pipe is deducted. It must overcome the water absorption height of the actual terrain. The installation height of the oil pump should not exceed the calculated value, otherwise, the oil pump will not be able to pump water. In addition, the magnitude that affects the calculated value is the resistance loss of the suction pipe. Therefore, it is advisable to use 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.
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 inlet of the oil pump will be damaged, and the water output of the oil 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.
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 water 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.
Centrifugal hot oil pump manufacturers and suppliers
Centrifugal hot oil pump manufacturers and suppliers
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