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A Review of Damage Accumulation Rules Applied to Maintenance Scheduling of Advanced Industrial Gas Turbines

[+] Author Affiliations
Friedrich O. Soechting, Vinod Kallianpur, Steven G. Koff, Jun-Hee Lee

Mitsubishi Power Systems, Lake Mary, FL

Yasuoki Tomita

Mitsubishi Heavy Industries, Takasago, Japan

Paper No. GT2002-30296, pp. 635-641; 7 pages
doi:10.1115/GT2002-30296
From:
  • ASME Turbo Expo 2002: Power for Land, Sea, and Air
  • Volume 4: Turbo Expo 2002, Parts A and B
  • Amsterdam, The Netherlands, June 3–6, 2002
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-3609-6 | eISBN: 0-7918-3601-0
  • Copyright © 2002 by ASME

abstract

Land based gas turbines are utilized to provide electric power on a continuous basis or just to satisfy peak consumer demand for a short operating period during each day. A unit that is operating on a continuous basis will incur few start and stop thermal cycles, and is typically referred to running in a baseload mode (BL). However, a unit that is operating to meet daily peak loads will accumulate an increased number of start and stop thermal cycles, and is typically referred to as operating in a daily start and stop mode (DSS). Gas turbine units are also operated with a weekly start and stop (WSS) cycle due to a different customer power demand. Hot parts in engines running in BL, WSS and DSS accumulate different levels of fatigue damage because thermal cycles vary significantly within the same actual operating hour period; e.g., the DSS engine will accumulate the most fatigue damage during the same operating hour period. Material testing has shown that an interaction of creep and fatigue damage produces a reduction in the fatigue life of a component. Different criteria and maintenance scheduling philosophy are used within the industrial gas turbine industry to account for the interaction of the creep and fatigue damage in engines. The purpose of this paper is to document how a maintenance scheduling philosophy has been developed that takes into account actual differences in engine usage on the capability of gas turbine hot parts and how current maintenance schedule intervals are being revised for Mitsubishi’s customers.

Copyright © 2002 by ASME

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