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日前受企业委托对5只超纯液氨罐式集装箱进行全面检验,依据TSG R7001-2013《压力容器定期检验规则》要求,该容器需要开罐、清洗和置换,达到检验条件后,方可进行检验。而容器一旦打开,外部空气进入,将会破坏容器内表面稳定的钝化层,目前国内还没有超纯液氨罐的钝化技术;另一方面,由于容器内部盛装纯度达到99.99999%的液氨,国内也没有能将容器内部置换为纯度达到7个9真空度的工艺,整个钝化和置换过程都需要在国外完成,检验成本耗费巨大。依
Recently commissioned by the enterprise on the 5 ultrapure liquid ammonia tank container for a comprehensive inspection, in accordance with TSG R7001-2013 “pressure vessel inspection rules” requirements, the container needs to open a can, cleaning and replacement, to meet the test conditions before test. Once the container is opened, the outside air will destroy the stable passivation layer on the inner surface of the container. At present, there is no passivation technology of the ultra-pure liquid ammonia tank; on the other hand, since the interior of the container contains liquid ammonia with the purity of 99.99999% , There is no domestic technology to replace the interior of the container to a purity of 7 9 vacuum process, the entire passivation and replacement process needs to be completed in foreign countries, the test cost is huge. according to