ANSI B36.10 refers to:

• A. Welded and seamless wrought steel pipe dimensions
• B. Pipe flanges and flanged fittings
• C. Gasket materials
• D. Valve types

Answer: (B)

ANSI B36.10 defines dimensions for welded and seamless wrought steel pipe, giving the nominal pipe size, outside diameter, and wall thickness for standard pipe schedules. This standard is what engineers use to determine the actual pipe size to order and to ensure compatibility with fittings and other pipe components. It does not cover flanges, gasket materials, or valve types, which are specified by other standards (such as ASME B16.5 for flanges and flanged fittings, gasket standards, and valve standards). There are both inch-based and metric-based editions of this standard, making it the go-to reference for pipe dimensions across different unit systems.