This Standard covers threaded malleable iron unions, classes 150, 250, and 300.It also contains provisions for using steel for NPS 1/8 unions. This Standard includes requirements for (a) design (b) pressure-temperature ratings (c) size (d) marking (e) materials (f) joints and seats (g) threads (h) hydrostatic strength (i) tensile strength (j) air pressure test (k) sampling (l) coatings (m) dimensions.
ASME B16.39-2014 history
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