Analysis of LPG Tank Cracking and Prevention Measures

During the periodic inspection, a lot of weld cracks were found in the inner surface of a liquefied petroleum gas(LPG) tank. By material analysis, hardness testing, macro testing, microstructure examination and so on, it was showed that the cracks were typical cracks of stress corrosion cracking(SCC). By investigations of mechanism of stress corrosion, media environment, stress level and so on, the causes of stress corrosion cracking were analyzed, and some prevention measures were proposed.