Failure Analysis of a Gas Turbine Marriage Bolt

  • Mohsen Mohammadi
  • Hamid Reza Salimi


A gas turbine exploded after 3 h of ordinary operation. This type of gas turbine works at maximum 5,100 rpm angular velocity and 18 MW output power. The rotor of the turbine had undergone repair after 77,000 operating hours and was then assembled on another unit of the power plant. Total operating hours and number of starts were 95,000 h and 4,785 times, respectively. The operating hours are listed in Table  1.
Table 1

Operating Hours of the Gas Turbine



Total operating hours

95,000 hours

Total number of starts

4,785 times

Operating hours prior to repair

77,000 hours

Operating hours after repair

18,000 hours


Coating Layer Journal Shaft Inlet Plenum Scan Electron Microscope Inspection Exhaust Diffuser 
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The authors are thankful to the executive manager of Ray power plant, Mr. Mohajerani, for his assistance in carrying out the research and permission to publish the article.


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Copyright information

© ASM International 2007

Authors and Affiliations

  1. 1.Mechanical and Materials EngineeringThe University of Western OntarioLondonCanada
  2. 2.Mechanical EngineeringSharif University of TechnologyTehranIran

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