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  1. Grade 70

    B31.3 or B31.4?

    @r6155 @1503-44 Respectfully, I disagree that b31.4 is for pipelines only Figure 400.1.1-1 in b31.4 states the word piping and clearly shows that piping that is outside of a process unit is b31.4 if it contains those hydrocarbon products Am I misunderstanding that ?

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