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随着工业的不断发展,液化石油气球罐越来越多,也越来越趋向大型化。为确保其安全经济的运行,对球罐的检验技术也相应的提出了更高的要求,尤其对球罐的置换的技术细节上,达到既安全又经济的实现球罐置换,是一个值得研究的课题。置换是液化石油气球罐全面检验前后必做的一项工作,也是保证检验安全进行的重要环节。球罐置换通常采用直接置换和间接置换两种方法。前者比较简便也较经济,但在置换过程中罐内必定存在可能爆炸的液化石油气—空气浓度范围,即形成爆炸性的混合气体,时刻存在爆炸的危险;后者是以水
With the continuous development of industry, liquefied petroleum gas tank more and more, more and more tend to large-scale. In order to ensure its safe and economical operation, the inspection of the spherical tank also put forward higher requirements correspondingly. In particular, it is worth to study the technical details of the replacement of the spherical tank in order to achieve the safe and economical replacement of the spherical tank. The subject. Replacement is a work to be done before and after the full inspection of liquefied petroleum gas spherical tank, and it is also an important part of ensuring the safety of inspection. Spherical tank replacement usually use direct replacement and indirect replacement of two methods. The former is simpler and more economical. However, the liquefied petroleum gas (LPG) concentration in the tank must exist during the replacement process, that is, the explosive mixture gas is formed, and there is a danger of explosion at any time. The latter,