目前我国LPG储罐大部分为球罐(容量120至2000立方米,常用的是400和1000立方米),其余为圆筒型卧式储罐。在开罐检查中经常发现微裂纹缺陷(施工中的冷裂纹和运行中受H_2S腐蚀产生的应力腐蚀裂纹)。据日本的研究,防止这种微裂纹的有效措施是采用自动焊以代替手工焊,同时作焊后热处理;而能同时满足这两项要求的结构型式是圆筒型罐,而不是球罐。因此,近年来日本对圆筒型罐的制造 At present, most LPG storage tanks in our country are spherical tanks (capacity of 120 to 2000 cubic meters, commonly used 400 and 1000 cubic meters), and the rest are cylindrical horizontal tanks. Microcracking defects (cold cracks in construction and stress corrosion cracking due to H 2 S corrosion during operation) are often found in open canning inspections. According to Japanese studies, an effective measure to prevent such micro-cracks is to use automatic welding instead of manual welding and post-weld heat treatment. Structures that can meet both of these requirements are cylindrical tanks instead of spherical tanks. Therefore, in recent years, Japan’s manufacture of cylindrical cans