Petroleum and petrochemical industries in Japan, the post construction code of piping in 20021), the post construction code of vessels and drums were enacted by Japan Petroleum Institute (JPI) respectively. These codes include practice along with 6 JPI recommended practices established in 20032). This paper discusses mainly a diagnosis method for chemical plant piping showing the implementation process for maintenance of in-site piping units in Japan maintenance companies, taking also the API method that is being employed recently in Japan into consideration.

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