– Lists acceptable pipe materials (e.g., ASTM A53 Grade B, seamless only above 6 inches). Forbids copper, brass, or galvanized steel due to corrosion.
– Contains the famous friction loss tables. For example, you will find line sizes for 100-foot equivalent lengths, with pressure drop limited to 1 psi per 100 feet for suction lines.
For occasional reference, consider borrowing a licensed copy from a colleague or using the free resources from ASHRAE and your local OSHA consultation office.
– Mandates qualified welders following ASME Section IX. Includes required post-weld heat treatment for thick-walled pipes.
A: ASME B31.5 covers refrigeration piping in general (including R-134a and CO2). IIAR 2 is specific to ammonia and is more stringent regarding materials, venting, and emergency isolation.