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ASM Failure Analysis Case Histories

Handbook of Case Histories in Failure Analysis

Edited by
Khlefa A. Esaklul
Khlefa A. Esaklul
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ASM International
Volume
2
ISBN electronic:
978-1-62708-215-0
Publication date:
1993
Book Chapter

Failure of a Reversible Flap Valve in a Thermal Power Station

By
K.K. Vasu
K.K. Vasu
Welding Engineering and Metallurgy Department, Larsen and Toubro Ltd.
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Published:
1993
Page range:
267 - 270

Abstract

A reversible four-way carbon steel flap valve in a thermal power station failed after 7 years of service. The flap had been fabricated by welding two carbon steel plates to both sides of a carbon steel forging. The valve was used for reversing the flow direction of seawater in the cooling system of a condenser. Visual examination of the flap showed crystalline fracture, indicating a brittle failure. Metallographic examination, chemical analyses, and tensile and impact testing indicated that the failure was caused by the notch sensitivity of the forging material, which resulted in low toughness. It was recommended that fully killed carbon steel with a fine-grain microstructure be used. Redesign of the flap to remove the step in the forging that acted as a notch was also recommended.

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K.K. Vasu, 1993. "Failure of a Reversible Flap Valve in a Thermal Power Station", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul

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