Abstract
In this paper, the failure cause of an ASTM A860-Grade WPHY42 tee in sour gas transmission piping service was investigated. Cracking was found in the tee by phased array ultrasonic testing. After rejection of the tee by fitness for service assessment levels I and II, to determine the root causes of cracking scientifically, chemical analysis, mechanical testing such as tensile and micro-hardness tests, and microstructural analysis such as optical microscopy and Scanning Electron Microscopy on the failed part were carried out in the laboratory. The results showed that the material of the tee conformed to the corresponding standard. However, the microstructural investigations revealed that the Hydrogen Induced Cracking (HIC) was responsible for the fracture of the tee. Therefore, to increase the performance of equipment in sour gas service or prolong lifetime, performing ultrasonic testing (UT) of steel before its installation and using clean steel and internal anti-corrosion coatings are recommended.
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