This paper describes the results of an investigation of bolt failures that occurred in a gate valve from a natural gas pipeline. Failures of this type are not common; therefore, it was important for the operator to know the failure cause so that an effective mitigation strategy could be implemented. Accordingly, a standard failure analysis consisting of optical photography, metallography, and scanning electron microscopy examination of the fracture surfaces was performed. It was concluded that the failures were a result of environmentally assisted cracking (EAC). Coating the bolts was chosen as the simplest method for mitigation. Corrosion tests were carried out on stressed bolts with and without the coating to demonstrate its ability to mitigate the EAC.
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2002 4th International Pipeline Conference
September 29–October 3, 2002
Calgary, Alberta, Canada
Conference Sponsors:
- Pipeline Division
ISBN:
0-7918-3620-7
PROCEEDINGS PAPER
Investigation of Bolt Failures on a Gate Valve From a Natural Gas Pipeline
D. M. Owen
,
D. M. Owen
CC Technologies Canada, Ltd., Calgary, AB, Canada
Search for other works by this author on:
J. A. Beavers
J. A. Beavers
CC Technologies Laboratories, Inc., Dublin, OH
Search for other works by this author on:
D. M. Owen
CC Technologies Canada, Ltd., Calgary, AB, Canada
J. A. Beavers
CC Technologies Laboratories, Inc., Dublin, OH
Paper No:
IPC2002-27237, pp. 1829-1836; 8 pages
Published Online:
February 24, 2009
Citation
Owen, DM, & Beavers, JA. "Investigation of Bolt Failures on a Gate Valve From a Natural Gas Pipeline." Proceedings of the 2002 4th International Pipeline Conference. 4th International Pipeline Conference, Parts A and B. Calgary, Alberta, Canada. September 29–October 3, 2002. pp. 1829-1836. ASME. https://doi.org/10.1115/IPC2002-27237
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