WW-P-521 Revision G:1977
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
PIPE FITTINGS, FLANGE FITTINGS, AND FLANGES, STEEL AND MALLEABLE IRON (THREADED AND BUTT WELDING) CLASS 150
05-21-1993
Describes fittings, threaded and butt welding, flanged fittings, and flanges, class 150.
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