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Centrifugal Pump Installation Height

Released on Oct. 23, 2018

The working principle of the Cantilever Type Centrifugal Pump is that the centrifugal pump can send water out due to the centrifugal force. Before the pump is working, the pump body and the inlet pipe must be filled with water to form a vacuum state. When the impeller rotates rapidly, the blade causes the water to rotate rapidly. The rotating water flies away from the impeller under the action of centrifugal force, and the water in the pump is After being thrown, the central portion of the impeller forms a vacuum region. The water from the water source is pressed into the inlet pipe through the pipe network under the action of atmospheric pressure (or water pressure). This cycle is not enough, you can achieve continuous pumping. It is worth mentioning here: before the centrifugal pump starts, it must be filled with water in the pump casing before it can be started. Otherwise, the pump body will not be able to complete the liquid absorption, causing the pump body to heat up, vibrate, and not produce water, resulting in “idle”. Damage to the pump (referred to as "gas binding") causes equipment accidents.

Suction Centrifugal Pump installation height Hg

Allowable suction vacuum height Hs is the maximum vacuum that can be reached by the pressure p1 at the pump inlet.

The actual allowable vacuum height Hs value 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 the user to check. It should be noted that the Hs value given in the pump sample is the value when the water is used as the working medium, the operating conditions are 20 ° C and the pressure is 1.013 × 105 Pa. When the operating conditions and working medium are different, the conversion is required.

(1) Conveying clean water, but the operating conditions are different from the experimental conditions, and can be converted according to the following formula

Hs1=Hs+(Ha-10.33)-(Hυ-0.24)

(2) Conveying other liquids When the conditions of the liquid to be transported and the villain are different from the experimental conditions, a two-step conversion is required: the first step is based on the Hs1 detected in the pump sample; the second step is as follows: Hs1 Converted to H's

suction centrifugal pump

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