The corrosion of pressure equipment such as corrosion under insulation, CUI, is the most common problem in refinery and petrochemical plants in recent years.

Fitness-For-Service, FFS, assessment technologies for pressure equipment have been studied in recent 15 years, and standardization of a FFS assessment procedure for local thin area, LTA, has been expected by maintenance engineers of process industries.

Based on the verification using extensive burst tests and FEM analysis of LTA, the Japan Welding Engineering Society, JWES, developed new FFS standard WES2820 in June 2015.[1]

This paper presents high lights of WES2820 and a FFS assessment system consisted with 3D optical measurement method and FFS software for LTA in pressure equipment as a new tool for effective inspection and reliable maintenance activities.

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