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北京某天然气储备厂的1台10000m~3球罐系从日本进口球壳板和预制件,在国内现场焊接组装,其结构形式为桔瓣形。球罐的基本参数,见表1。该球罐在运行1年之后,于1990年对该球罐进行第一次开罐检查。在磁粉探伤检查中发现,在球罐内表面的下极板处存在微裂纹。经对球罐产生裂纹的原因进行分析,找出主要原因,并提出预防措施。在15年运行中,经2次开罐检查,其重点仍是在首次开罐检查中发现问题的部位,经内外部各项检验,既无新缺陷产生,原缺陷也无发展,球罐全部合格。
A 10000m ~ 3 ball tank from a certain natural gas storage plant in Beijing imported spherical shell plates and prefabricated parts from Japan and was welded and assembled in the domestic site. Its structure is in the shape of orange. The basic parameters of the tank, see Table 1. After one year of operation, the spherical tank was first tank checked in 1990. In magnetic particle inspection, it was found that there were microcracks at the lower plate of the inner surface of the spherical tank. After analyzing the causes of cracks in the spherical tank, find the main reasons and put forward preventive measures. In 15 years of operation, after 2 open canning inspection, the focus is still on the first open canning inspection found the problem site, the internal and external inspection, there is no new defect, the original defect has no development, all of the spherical tank qualified.