ANSI/ASME B16.9 covers which components?

• A. Valve assemblies
• B. Piping supports
• C. Wrought butt-welding fittings
• D. Gaskets

Answer: (C)

The main idea is that this standard defines factory-made wrought butt-welding fittings used in pressure piping. It sets the dimensions, tolerances, and fabrication details for fittings that join pipe runs by butt welding, such as elbows, tees, reducers, caps, and similar shapes, all produced to a consistent, interchangeable size and geometry. This scope is what makes it the right choice for describing components that are specifically “wrought butt-welding fittings.”

These fittings are distinct from valve assemblies, which are covered by valve-specific standards, and from piping supports or gaskets, which fall under different standards and categories. So, the standard is the go-to reference for the fittings that are butt-welded into piping systems, not for valves, supports, or gasket materials.