Method of on-line monitoring of radial clearances in steam...

Details Method of on-line monitoring of radial clearances in steam... Method of on-line monitoring of radial clearances in steam...

2005-02-08

2005-02-08

Hoff, Marc S. (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system

Temperature measuring system

C060S782000, C701S100000

Reexamination Certificate

active

06853945

ABSTRACT:
A method of monitoring radial clearances in a steam turbine during operation of the turbine is provided. The method, in an exemplary embodiment, includes measuring a temperature of the rotor shaft at a time1and at a time2, measuring a temperature of the rotor blade at time1and at time2, measuring a temperature of the shell at time1and at time2, calculating a shaft radial growth between time1and time2, calculating a blade growth between time1and time2, calculating a shell radial growth between time1and time2, and determining a change in a radial gap between the shell and a distal end of the rotor blade from time1to time2using the following equation: change in radial gap=shell radial growth−shaft radial growth−blade growth.

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