Overload Failure of a Crane on an Offshore Platform Related to Stress-Corrosion Cracking
Failed ferrous components were analyzed from a crane that operated on an offshore platform. The crane failed during operation and fell into the sea. The brake spring on the boom hoist was found to have fractured in four places. The spring contained a line defect (seam) that was the source of each crack. The fracture of the oil quenched and tempered (HRC 50 ASTM A229) spring was by stress-corrosion cracking after the crane fell into the sea because fatigue cannot account for the fractures observed. The crane failure was caused by an overload created by the operator catching a free-falling load.
A. O. Ibidunni, J. C. Bookwalter, D. A. Guenther, Overload Failure of a Crane on an Offshore Platform Related to Stress-Corrosion Cracking, ASM Failure Analysis Case Histories: Improper Maintenance, Repair, and Operating Conditions, ASM International, 2019, https://doi.org/10.31399/asm.fach.usage.c9001672
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