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ASME B16.1 2015 Edition, December 28, 2015
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Gray Iron Pipe Flanges and Flanged Fittings Classes 25, 125, and 250
Page Count:70
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This Standard covers Classes 25, 125, and 250 Gray Iron Pipe Flanges and Flanged Fittings. It includes

(a) pressure–temperature ratings

(b) sizes and method of designating openings of reducing fittings

(c) marking

(d) materials

(e) dimensions and tolerances

(f) bolting and gaskets

(g) pressure testing