ASME B31.9 covers which category of piping?

• A. Nuclear plant piping
• B. Building services piping
• C. Gas transmission piping
• D. Process piping

Answer: (B)

The main idea is understanding how ASME B31 codes categorize piping by where it’s used. ASME B31.9 is the standard for Building Services Piping, which means it covers piping systems inside buildings that carry everyday building services such as water, heating, cooling, and other utilities. This scope is specific to piping within structures, not to large-scale plants or pipelines.

Why this is the best fit: Building services piping focuses on the design, materials, fabrication, installation, testing, and inspection of piping that serves a building’s internal systems. It doesn’t address piping for power generation, processing plants, or external gas transmission, which are covered by other ASME B31 chapters.

For context, piping for nuclear plant facilities, power systems, or process plant operations is handled by other standards (such as B31.1 for power piping and B31.3 for process piping), and gas transmission pipelines fall under B31.8. So the category described by this standard—building services piping—fits the scope best.