ANSI B16.5 standard specifies requirements for:

• A. Pipe flanges and flanged fittings
• B. Welding procedures
• C. Piping supports
• D. Gasket materials

Answer: (A)

ANSI B16.5 defines the scope and requirements for pipe flanges and flange fittings. It sets the dimensions, tolerances, pressure–temperature ratings, and marking for flanges (such as weld neck, slip-on, threaded, and blind flanges) and their flanged fittings, ensuring compatibility and interchangeability across manufacturers. Welding procedures are governed by ASME IX (not B16.5), piping supports by other piping codes (such as the B31 series), and gasket materials are specified by different standards or material specifications. So the standard is focused on flanges and flange fittings, making that option the correct match.