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.
In the world of industrial refrigeration, few documents carry as much weight as those published by the . For engineers, facility managers, and safety inspectors working with anhydrous ammonia (R-717), the IIAR Ammonia Refrigeration Piping Handbook is considered the "gold standard" for design, installation, and inspection. iiar ammonia refrigeration piping handbook pdf link
– Diagrams for expansion loops and hanger spacing. Crucial to prevent pipe breakage from thermal cycling. A: ASME B31