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  1. CWIMET

    Number of times you can PWHT P91

    Does anyone have any experience or preference on the number of PWHT cycles that may be performed on Grade 91? We have a CC HRSG that has had multiple repairs (multiple PWHT's) performed on a P91 stop valve (repair of Small Bore by-pass line, replacement of same, removal and plugging of by-pass...

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