Turbine Blade Tip Clearance Measurements in a Large Industrial Two-Shaft Gas Turbine PUBLIC ACCESS

[+] Author Affiliations
J. Van Den Andel

Westinghouse Canada Inc., Hamilton, ON, Canada

Paper No. 82-GT-62, pp. V001T01A023; 6 pages
  • ASME 1982 International Gas Turbine Conference and Exhibit
  • Volume 1: Turbomachinery
  • London, England, April 18–22, 1982
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7956-6
  • Copyright © 1982 by ASME


In horizontally split gas turbines, distortions of the cylinders may be expected, especially during start-up conditions. This article describes how the distortions of an inner cylinder were first measured outside the turbine by placing it on a horizontal boring mill while heating the inner diameter. Modifications were made to reduce the distortion and the difference is shown. The cylinder was then tested in the actual turbine (CW352) where the diameter was compared with the presumably perfect circle described by the passing blades. Three monitors were used to determine the gap between the blades and the seal plates which are a part of the inner cylinder. Described is how a high accuracy is obtained using complex touch probe actuators and an electronic control unit which computes the blade-to-seal-plate gap and displays it for read out. A computer interface allows the information to be stored in the master computer for recall.

Copyright © 1982 by ASME
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