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- ANSI/ASME B16.5 covers pipe flanges and flanged fittings for sizes from NPS 1/2 to NPS 24. It includes materials, pressure-temperature ratings, dimensions, tolerances, marking, and testing.
- ANSI/ASME B16.47 covers large diameter steel flanges (NPS 26 through NPS 60) in both Series A and Series B, including pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing.
- Series A (formerly MSS SP-44) flanges are designed for higher pressure and have thicker and heavier designs, making them suitable for critical applications.
- Series B (formerly API 605) flanges are less thick and lighter, designed for less critical, non-hazardous environments.
- ASME B16.5 flanges are available in pressure classes 150, 300, 400, 600, 900, 1500, and 2500.
- ASME B16.47 flanges come in pressure classes 75, 150, 300, 400, 600, and 900.
