Analysis of the failure of an offshore compressor crankshaft

Case studies in engineering failure analysis Pub Date : 2016-10-01 DOI:10.1016/j.csefa.2016.07.001

William Harris, Keith Birkitt

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引用次数: 8

Abstract

During the inspection of a North Sea oil and gas platform a crack was identified on the crankshaft of a compressor.

Subsequently, the component was decommissioned and a failure examination undertaken to determine the mechanism of failure. The crankshaft was analysed using a range of inspection, measurement and fractographic techniques.

Magnetic particle inspection (MPI) indicated that the crack extended for the majority of the shaft's length, rotating through approximately 225 degrees of the shaft's circumference. Laser scanning verified the dimensions and concentricity of the crankshaft were in accordance with the manufacturer's specifications. On sectioning the crack and forcing it open, complex fracture features were revealed. Optical and scanning electron microscopy were used to examine these features as well as the surface of the crankshaft.

The investigation determined that the mechanism of failure of the crankshaft was probably corrosion fatigue, initiating from localised corrosive attack on the crankshaft's surface.

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海上压缩机曲轴故障分析

在对北海某油气平台的检查中，在压缩机的曲轴上发现了一条裂缝。随后，该组件退役，并进行失效检查以确定失效机制。曲轴分析使用了一系列的检查，测量和断口技术。磁粉检测(MPI)表明，裂纹延伸了轴的大部分长度，旋转了大约225度的轴周长。激光扫描验证曲轴的尺寸和同心度符合制造商的规格。对裂纹进行剖开，显示出复杂的断裂特征。利用光学显微镜和扫描电子显微镜对曲轴表面和这些特征进行了检查。调查确定曲轴的失效机制可能是腐蚀疲劳，由曲轴表面的局部腐蚀攻击引起。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Case studies in engineering failure analysis

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