Cause analysis of cracking and head bulges in natural gas final desulfurization tank
A fire broke out for the reason of cylinder body cracking during the operation of a natural gas final desulfurization tank.The cracking of cylinder body and head bulge was studied by employing chemical analysis,metallographic inspection,mechanical performance testing and fracture morphology analysis.The finding suggested that hydrogen corrosion occurred inside cylinder and head during the service process of equipment and further led to holes inside material,resulting in decreased strength,poor impact toughness and cracks on the surface of cylinder.The amount of holes generated at head was lower than that at cracking area of cylinder,and the head was thicker than that of cylinder.The internal pressure decreased after the cracking of cylinder,resulting in formation of bulges at head.
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