ASME B31.4 covers which piping types?

• A. High-pressure gas lines
• B. Hydraulic piping for aircraft
• C. Slurry piping, liquid petroleum transportation piping, power piping, refrigeration piping
• D. Water distribution piping

Answer: (C)

ASME B31.4 defines the scope for piping systems that transport liquids other than water. It is the code used for piping that moves liquids such as slurry and petroleum products, and it also covers related liquid piping in systems like refrigeration and power facilities. The other options fall outside this scope: high‑pressure gas lines are governed by gas piping standards, hydraulic piping for aircraft is outside the general B31 piping scope, and water distribution piping is typically addressed by water-supply standards rather than B31.4. Therefore, the category that includes slurry piping and liquid petroleum transportation piping (along with refrigeration and power piping when they involve liquid transport) best fits what B31.4 covers.