ASME B16.28 Standard covers ratings, overall dimensions, testing, tolerances, and markings for wrought carbon and alloy steel buttwelding short radius elbows and returns. The term wrought denotes fittings made of pipe, tubing, plate, or forgings. ASME B16.28 Buttwelding Short Radius Elbows Fabricated Fittings Fabricated fittings employing intersection welds are not covered by this Standard. Design of such fittings is covered in the ASME B31, Code for Pressure Piping or the ASME Boiler and Pressure Vessel Code. References Referenced Standards. Standards and specifications adopted by reference in this Standard are shown in Annex B, which is part of this Standard. It is not considered practical to identify the specific edition of each standard and specification in the individual references. Instead the specific edition reference is identified in Annex B. A product made in conformance with a prior edition of reference standards and in all other respects conforming to this Stand