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Cast and Forged Steel and Nickel-Alloy Flanged Fittings
Flanged fittings of steel and nickel alloys are manufactured in accordance with ASME B16.5. The standard covers ratings, materials, dimensions, tolerances, marking, testing, and methods of designating openings for pipe flanges and flanged fittings in sizes NPS 1⁄₂ (DN 15) through NPS 24 (DN 600) and in rating Classes 150, 300, 400, 600, 900, 1500, and 2500. However, not all sizes are available in all pressure classes. Dimensions of more commonly used fittings are given in Table A2.7. The standard also contains recommendations and requirements for bolting and gaskets. Within each pressure class, the dimensions of the fittings are held constant, irrespective of the materials being used. Since the physical properties of different materials vary, the pressure-temperature ratings within each pressure class vary with the material. As an example, a Class 600 forged carbon steel (A105) flange is rated at 1270 psig at 400_F, whereas a Class 600 forged stainless steel (A182, F304) flange is rated at 940 psig at 400_F. The matrix of materials and pressure classes is too numerous to reproduce here; therefore, the reader is referred to ASME B16.5 for the flanged fitting pressure-temperature ratings. Figures A2.1, A2.2, and A2.3 illustrate the reduction in pressure rating with increase in temperature for group 1.1 (ASTM A105), 1.10 (ASTM A182, Gr. F22, Cl. 3), and 2.1 (ASTM A182, Gr. F304) materials.
Flanged fittings of steel and nickel alloys are manufactured in accordance with ASME B16.5. The standard covers ratings, materials, dimensions, tolerances, marking, testing, and methods of designating openings for pipe flanges and flanged fittings in sizes NPS 1⁄₂ (DN 15) through NPS 24 (DN 600) and in rating Classes 150, 300, 400, 600, 900, 1500, and 2500. However, not all sizes are available in all pressure classes. Dimensions of more commonly used fittings are given in Table A2.7. The standard also contains recommendations and requirements for bolting and gaskets. Within each pressure class, the dimensions of the fittings are held constant, irrespective of the materials being used. Since the physical properties of different materials vary, the pressure-temperature ratings within each pressure class vary with the material. As an example, a Class 600 forged carbon steel (A105) flange is rated at 1270 psig at 400_F, whereas a Class 600 forged stainless steel (A182, F304) flange is rated at 940 psig at 400_F. The matrix of materials and pressure classes is too numerous to reproduce here; therefore, the reader is referred to ASME B16.5 for the flanged fitting pressure-temperature ratings. Figures A2.1, A2.2, and A2.3 illustrate the reduction in pressure rating with increase in temperature for group 1.1 (ASTM A105), 1.10 (ASTM A182, Gr. F22, Cl. 3), and 2.1 (ASTM A182, Gr. F304) materials.
Forged Steel Threaded and Socket Welding Fittings
Forged-steel socket welding and threaded fittings are manufactured in accordance with
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| FIGURE A2.1 Operating temperature versus allowable working pressure for ASME B16.5 flanges and flanged fittings Group 1.1 materials. |
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| FIGURE A2.2 Operating temperature versus allowable working pressure for ASME B16.5 flanges and flanged fittings—Group 1.10 materials. |
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| FIGURE A2.3 Operating temperature versus allowable working pressure for ASME B16.5 flanges and flanged fittings—Group 2.1 materials. |
nice blog on forged fittings carbon steel
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