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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
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Book Chapter

Brittle Fracture of a Marine Riser Clamp

Salah E. Mahmoud
Salah E. Mahmoud
Exxon Production Research Company
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Page range:
385 - 388


An API type 2 steel clamp located on the riser of a semisubmersible drilling rig between the lower ball joint and riser blowout preventer (BOP) conductor failed after 7 years of service. Failure analysis revealed the cause of failure to be the low toughness of the clamp material. Contributing factors included the presence of a hard, brittle, heat-affected zone and weld defects at the handling pad eye. It was recommended that the replacement clamp be made from a material with good toughness and that any installation of attachments by welding be done according to qualified procedures.

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Salah E. Mahmoud, 1992. "Brittle Fracture of a Marine Riser Clamp", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul

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