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The US pipe ratings are for Steam Pressure at Saturated Steam Temperature. 40 pound pipe was designed for 40 psig steam. These days, the dimensions are important, since that is now what defines "Schedule 40" pipe, no matter the material. And the "size" is the nominal inside diameter.
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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