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February 25, 2013 at 9:23 pm #5850

masoud
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Hi everybody,
I’ve seen numerous piping spec in oil & gas works. In most of them, some sizes are excluded from usage in the design, despite of their availability in manufacturers catalog. I understand exclusion of 5″, 7″ or 9″ but can’t get reason for 22″ and 26″. Does anybody know?
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Masoud
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