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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
1
ISBN electronic:
978-1-62708-214-3
Publication date:
1992
Book Chapter

Hydrogen Embrittlement of P-110 Couplings for Mating 180 mm (7 in.) Casing in Oilfield Production

By
Clifford W. Peterson
Clifford W. Peterson
Exxon Production Research Company
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;
James Day
James Day
Exxon Company
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Published:
1992
Page range:
396 - 400

Abstract

Several tin plated, low-alloy steel couplings designed to connect sections of 180 mm (7 in.) diam casing for application in a gas well fractured under normal operating conditions. The couplings were purchased to American Petroleum Institute (API) specifications for P-110 material. Chemical analysis and mechanical testing of the failed couplings showed that they had been manufactured to the API specification for Q-125, more stringent specification than P-110, and met all requirements of the application. Fractographic examination showed that the point of initiation was an embrittled region approximately 25 mm (1 in.) from the end of the coupling. The source of the embrittlement was determined to be hydrogen charging during tin plating. Changes in the plating process were recommended.

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Clifford W. Peterson, James Day, 1992. "Hydrogen Embrittlement of P-110 Couplings for Mating 180 mm (7 in.) Casing in Oilfield Production", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul

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