This standard specifies types and dimensions, technical requirements, inspection, acceptance, packaging and marking.
This standard is applicable to "A-type Socket-weld Flange" (NB/T 47021), "B-type socket-weld flange" (NB/T 47022) and "Welding Neck Flange" (NB/T 47023); other vessel flanges or pipe flanges may also refer to it.
Foreword I 1 Scope 1 2 Normative References 1 3 Types and Dimensions of Stud Bolts & Nuts 1 4 Technical Requirements 3 5 Inspection, Acceptance and Packaging 3 6 Marking 3