ASME Code Standards for Pressure Vessels and Piping Engineering Practice Test

ANSI B16.47 covers large-diameter pipe flanges and flanged fittings. It defines the dimensions, bolt patterns, and pressure ratings for flanges used on pipelines larger than about 24 inches nominal diameter, typically for steel flanges. This is why large-diameter steel flanges are the best answer: B16.47 specifically addresses those components, while small-diameter valves, cast iron pipe fittings, and gaskets are covered by other standards or are not the scope of this flange standard.