ASME B16.47 Series B (API 605) Flanges – Class 300 lb
– ASME B16.47 Series B flanges are API 605 flanges. API 605 has been cancelled.
– Class 400 Series A dimensions at NPS 38 and larger also apply to Class 400 Series B flanges.
– Dimension B is to be specified by the purchaser. It corresponds to the pipe inside diameter.
– Flat face flanges may be provided at full thickness, C, or with raised face removed (the latter is nonstandard).
– WNF = Weld Neck Flange.
– The large end of the hub may be straight or tapered.