Carbon Steel buttweld fittings. Covers overall dimensions, tolerances, ratings, testing and marking ofbuttweld fittings 15mm to 1200mm.
Buttweld ends. Covers the preparation and design details of buttweld ends for all components of buttwelded pipe systems. It includes requirements for welding bevels for external and internal shaping of heavy wall components and for preparation of internal ends (including dimensions and tolerances)
1. MSS SP-48:
Carbon Steel buttweld fittings 650mm and larger. Covers dimensions and tolerance of long radius elbows, tees and reducers in sizes 650 to 900mm.