Main Ways of Adjusting Centrifugal Pump Flow

Centrifugal pump is used for transferring drilling mud. It can be used as feeding pump for desander  desilter or used as mixing pump for jet mud mixer. Also it can be used as trip pump, and supercharging pump for rig mud pump

centrifugal pump

Main ways of adjusting centrifugal pump flow as follows:

1. change pipeline characteristic curve

the easiest way to change centrifugal pump flow is using the pump outlet valve opening to control, its essence is to change the position of the pipeline characteristic curve in order to changing pump operating point.

2. change centrifugal pump characteristic curve

According to proportion law and cutting law, change pump rotating speed, change pump structure (such as cutting impeller diameter method) both methods can change centrifugal pump characteristic curve, thus achieved the flow adjustment (meanwhile changing the pressure head) purpose. But to worked pumps, change pump structure change is hard, and the change of the pump structure, reduce the generality of the pump, although at some time adjust flow economy is convenient [1], while it is seldom used during production. Here only analysis centrifugal pump rotation speed changing flow adjustment methods. Figure 1, when changing pump rotating speed adjust flow from Q1 dropped to Q2, pump rotating speed (or motor speed) from n1 to n2, speed is n2 pump characteristic curve Q – H and pipeline characteristic curve He=H0+G1Qe2 (pipeline characteristics curve is not change) delivered over to point A3 (Q2, H3), A3 is speed adjust flow through after new operates. This adjustment methods adjust effect is obvious, quick, safe and reliable, can prolong pump service life, saving energy, in addition to reducing speed operation is effective in reducing centrifugal pump NPSHr, making pump far away from cavitation zone, decrease centrifugal pump cavitation possibility. Defect is change pump rotating speed needs the rotating speed through frequency conversion technology to change the prime mover (usually motors), complex principle, greater investment, and small flow adjusting range.

3. parallel, serial adjustable mode

When single centrifugal pump cannot satisfy the conveying tasks, can use centrifugal pump parallel or tandem operation. Using two same model centrifugal pump parallel, although the pressure head change is not big, but increase the overall conveying flow, the shunt pump total efficiency and single pump efficiency is the same; Centrifugal pump series total pressure head increases, flow changes a little, series pump total efficiency and single pump efficiency are the same.

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