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1980年后,全国各使用球罐单位相继对运用中的球罐进行了开罐检查。经检查发现,其中相当一部分球罐存在着较严重的缺陷,不满足建造球罐质量控制标准。对于这类球罐,通常按照国际上最近发展起来的“合乎使用的缺陷评定标准”对球罐进行分析,确定返修范围并给出修复后的损伤容限裕度及创性储备。球罐返修前,通常要对内外表面主焊道及临时性焊点进行100％的磁粉探伤,对深埋缺陷进行100％的超探,以及若干部位的x光相结合的定性检查。在修复时,原则上依照国家劳动总局颂发的“球形贮罐缺陷修复暂行办法”,表面裂
After 1980, the use of spherical tank units all over the country successively carried out canning inspection on the spherical tank in use. The inspection found that a considerable part of the spherical tank there are more serious flaws, does not meet the construction of spherical tank quality control standards. For such spherical tanks, the spherical tank is usually analyzed in accordance with the recently developed International Standards for Evaluating Defective Flaws to determine the scope of rework and to give a margin of damage tolerance and a creative reserve after repair. Before the tank is reworked, it is usually necessary to carry out 100% magnetic particle inspection of the main weld and the temporary weld on the inner and outer surfaces, 100% ultrasonography of the deep defect, and the qualitative examination of the combination of x-rays of several parts. In the repair, in principle, in accordance with the State Administration of Labor issued “Interim Measures for the repair of spherical tank defects,” cracked surface