Which standard specifies requirements for pipe flanges and flanged fittings?

Which standard specifies requirements for pipe flanges and flanged fittings?

• A. ANSI B36.10
• B. ASME Section IX
• C. ANSI B16.5
• D. B31.3

Answer: (C)

This question hinges on identifying the standard that specifically governs pipe flanges and flanged fittings, including their dimensions, bolt patterns, pressure classes, and related details. The standard that does this is ANSI/ASME B16.5. It provides the dedicated rules for flange types (like slip-on, weld neck, blind, threaded, etc.), flange sizes, shapes, wall thicknesses, bolt hole patterns, and the pressure–temperature ratings that ensure proper mating and safe operation in piping systems. The other options don’t define flange geometry and compatibility in the same focused way: ANSI B36.10 covers pipe outside diameters and schedules rather than flange interfaces; ASME Section IX deals with welding, brazing, and soldering qualifications; and B31.3 is a broader Process Piping Code that governs design and integrity of piping systems and may reference flange standards but does not specify flange dimensions and ratings itself.

This question hinges on identifying the standard that specifically governs pipe flanges and flanged fittings, including their dimensions, bolt patterns, pressure classes, and related details. The standard that does this is ANSI/ASME B16.5. It provides the dedicated rules for flange types (like slip-on, weld neck, blind, threaded, etc.), flange sizes, shapes, wall thicknesses, bolt hole patterns, and the pressure–temperature ratings that ensure proper mating and safe operation in piping systems.

The other options don’t define flange geometry and compatibility in the same focused way: ANSI B36.10 covers pipe outside diameters and schedules rather than flange interfaces; ASME Section IX deals with welding, brazing, and soldering qualifications; and B31.3 is a broader Process Piping Code that governs design and integrity of piping systems and may reference flange standards but does not specify flange dimensions and ratings itself.