John,
B16.47 (I have 1996 edition which I think is the latest) covers flanges from 26 through 60 diameter. It includes weld neck and blind flanges only. There are two types of flange included: Series A and Series B.
Series A are the former MSS SP-44 flanges. Classes included are 150, 300, 400, 600 and 900.
Series B are the former API 605 flanges. Classes included are 75, 150, 300, 400, 600 and 900.
Regards,
_________________________
Ricardo