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Method for barring a rotor of a turbomachine and barring apparatus for conducting such method

  • US 9,970,328 B2
  • Filed: 01/15/2014
  • Issued: 05/15/2018
  • Est. Priority Date: 01/16/2013
  • Status: Expired due to Fees
First Claim
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1. A method for barring a rotor of a thermally loaded turbomachine, comprising:

  • stopping normal operation of said turbomachine;

    providing a barring device for rotating said rotor about a machine axis;

    coupling said barring device to said rotor; and

    providing cool down of said rotor;

    wherein during cool down of said rotor;

    rotating said rotor by means of said barring device;

    determining consecutively by measurement, a force or torque applied to said rotor by said barring device for rotating said rotor and/or the circumferential speed of the rotor during barring;

    identifying a position of a bending or imbalance of said rotor based on the force or torque applied to said rotor and/or the circumferential speed of the rotor; and

    controlling the rotation of said rotor by means of said barring device in dependence of said determined force or torque and/or circumferential speed in order to reduce a bending or imbalance of said rotor, which is due to a nonuniform temperature distribution on said rotor during cool down,wherein said barring device includes a shaft, a pin, and a piston, the barring device initiating a barring action on the rotor by generating, via the pin, a reciprocating movement of rotation of the shaft to drive the piston for engagement of the rotor.

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