Evaluation of Remaining Strength of Corrosion Simulated Pipes by API579-1⁄ASME FFS-1 Fitness-For-Service

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  • API579-1⁄ASME FFS-1 供用適性評価による模擬腐食配管の残存強度評価
  • API579-1/ASME FFS-1供用適性評価による模擬腐食配管の残存強度評価
  • API579-1/ASME FFS-1 キョウヨウ テキセイ ヒョウカ ニ ヨル モギ フショク ハイカン ノ ザンソン キョウド ヒョウカ

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Pressure equipment used in the petroleum and petrochemical industries develop locally thinned areas, which are caused by damage related to aging. In order to stably operate such pressure equipment, proper evaluation of the integrity of the pressure equipment with locally thinned areas is very important. The American Petroleum Institute (API) and the American Society of Mechanical Engineers (ASME) recommend Fitness-For-Service (FFS) as a method of integrity evaluation. In the present study, <br>complicated locally thinned areas are generated in nine test pipes using a corrosive liquid, and the test pipes are then burst in burst tests. The estimated burst pressure, <br>which is calculated based on the assessment of local metal loss and through finite element analysis (FEA) based on API⁄ASME FFS-1, is compared with experimentally obtained burst pressures in order to validate the integrity evaluation by FFS. The estimated burst pressures agree well with the experimental results, except for test pipes with locally deep areas of metal loss. Moreover, the burst pressure estimated by FEA is lower than that obtained through the assessment of local metal loss. Therefore, FFS is demonstrated to be useful in the integrity evaluation of pipes with complicated locally thinned areas.

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