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Cavitation limiting strategies for pumping system

  • US 10,134,257 B2
  • Filed: 08/05/2016
  • Issued: 11/20/2018
  • Est. Priority Date: 08/05/2016
  • Status: Active Grant
First Claim
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1. A method of operating a pumping system comprising:

  • moving a pumping element in a pump to transition a liquid between a pump inlet and a pump outlet in the pump;

    receiving inlet pressure data indicative of an inlet pressure of the liquid at the pump inlet, and pumping speed data indicative of a pumping speed of the pump;

    determining a pressure value based at least in part on the inlet pressure data and the pumping speed data that is indicative of a pressure of the liquid within a bore in the pump susceptible to cavitation of the liquid; and

    varying at least one of the pumping speed or the inlet pressure, responsive to the determined value;

    wherein the receiving of inlet pressure data indicative of an inlet pressure of the liquid further includes receiving data from a pressure sensor exposed to the inlet pressure of the liquid, and wherein the pump includes a reciprocating pump having a rotatable crankshaft and the receiving of pumping speed data indicative of a pumping speed includes receiving data from a second sensor structured to monitor a parameter indicative of rotational speed of the rotatable crankshaft; and

    wherein the determining of the pressure value indicative of a pressure of the liquid within the bore includes determining a pressure value that is reduced relative to the inlet pressure according to the equation;


    Pbore=Pin

    [G]−

    [X]v
    7/4plunger

    [Y]a
    plunger

    [Z]v
    2plunger where;

    Pbore=pressure in the bore;

    Pin=inlet pressure;

    v=plunger velocity;

    a=plunger acceleration; and

    G, X, Y, Z are numeric coefficients dependent upon at least one of a density of the liquid, a viscosity of the liquid, or a structural attribute of the pump.

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