For few posting in the next post that would be a lot of table will comes according with ASME and now Piping & Fabrication will continue with Wrought Steel Butt Welding Fitting full with the table.
Wrought-Steel Butt-Welding Fittings
Wrought-steel welding fittings include elbows, tees, crosses, reducers, laterals, lap joint stub ends, caps, and saddles. Wrought-steel fittings are made to the dimensional requirements of ASME B16.9 in sizes NPS 1⁄₂ (DN 15) through NPS 48 (DN 1200). Also, short-radius elbows and returns are produced in accordance with ASME B16.28 in sizes NPS 1⁄₂ (DN 15) through NPS 24 (DN 600). The wrought fitting materials conform to ASTM A234, A403, or A420, the grades of which have chemical and physical properties equivalent to that of the mating pipe. ASME B16.9 requires that the pressure-temperature rating of the fitting equal or exceed that of the mating pipe of the same or equivalent material, same size, and same nominal wall thickness. The pressure-temperature rating may be established by analysis or by proof testing. Short-radius elbows and returns (fitting centerline bend radius is equal to the fitting NPS) manufactured under ASME B16.28 are rated at 80 percent of the rating calculated for seamless straight pipe of the same size and nominal thickness and same or equivalent material.
Therefore, both standards require that, in lieu of specifying any pressure rating, the pipe wall thickness and pipe material type with which the fittings are intended to be used be identified on the fitting. Pressure testing of the fittings is not required by either standard. However, the fittings are required to be capable of withstanding, without leakage, a test pressure equal to that prescribed in the specification of the pipe with which the fitting is recommended to be used. Both ASME B16.9 and B16.28 prescribe dimensions and manufacturing tolerances of wrought butt-welded fittings. The standards establish laying dimensions, which remain fixed for each size and type of fitting irrespective of the fitting wall thickness. Tables A2.11, A2.12, A2.13, A2.14, and A2.15 list the laying dimensions and approximate weights for selected fitting sizes, pipe schedules, and configurations.
Wrought-steel welding fittings include elbows, tees, crosses, reducers, laterals, lap joint stub ends, caps, and saddles. Wrought-steel fittings are made to the dimensional requirements of ASME B16.9 in sizes NPS 1⁄₂ (DN 15) through NPS 48 (DN 1200). Also, short-radius elbows and returns are produced in accordance with ASME B16.28 in sizes NPS 1⁄₂ (DN 15) through NPS 24 (DN 600). The wrought fitting materials conform to ASTM A234, A403, or A420, the grades of which have chemical and physical properties equivalent to that of the mating pipe. ASME B16.9 requires that the pressure-temperature rating of the fitting equal or exceed that of the mating pipe of the same or equivalent material, same size, and same nominal wall thickness. The pressure-temperature rating may be established by analysis or by proof testing. Short-radius elbows and returns (fitting centerline bend radius is equal to the fitting NPS) manufactured under ASME B16.28 are rated at 80 percent of the rating calculated for seamless straight pipe of the same size and nominal thickness and same or equivalent material.
Therefore, both standards require that, in lieu of specifying any pressure rating, the pipe wall thickness and pipe material type with which the fittings are intended to be used be identified on the fitting. Pressure testing of the fittings is not required by either standard. However, the fittings are required to be capable of withstanding, without leakage, a test pressure equal to that prescribed in the specification of the pipe with which the fitting is recommended to be used. Both ASME B16.9 and B16.28 prescribe dimensions and manufacturing tolerances of wrought butt-welded fittings. The standards establish laying dimensions, which remain fixed for each size and type of fitting irrespective of the fitting wall thickness. Tables A2.11, A2.12, A2.13, A2.14, and A2.15 list the laying dimensions and approximate weights for selected fitting sizes, pipe schedules, and configurations.
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| TABLE A2.11 Dimensions of Typical Commercial 90 degree Long-Radius Butt-Welding Elbows |
Laterals are not governed by any national standard. However,
Dimensional tolerances of laterals vary not more than _1/32 in (1.0 mm) for sizes up to and including NPS 8 (DN 200) and _1/16 in (2.0 mm) for sizes NPS 10 (DN 250) through NPS 24 (DN 600).
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| TABLE A2.12 Dimensions of Typical Commercial 90 degree Short-Radius Elbows |
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