The is widely regarded as the definitive technical manual for the design and installation of ammonia piping systems. Produced by the International Institute of Ammonia Refrigeration (IIAR), it serves as a critical bridge between theoretical engineering and field application. 🏗️ Core Content & Focus
: Threaded joints are restricted to small pipe diameters (usually 1.25 inches or smaller) and high-pressure schedules. The vast majority of joints must be butt-welded by certified welders in compliance with ASME Section IX and ASME B31.5 (Refrigeration Piping and Heat Transfer Components). Managing Thermal Expansion and Insulation
It provides explicit piping designs—such as drop-legs, oil separators, and specialized drainage valves—to safely capture and remove logged oil without releasing ammonia into the atmosphere. 4. Insulation and Vapor Retarders
The “Handbook” moniker fits because IIAR 2 is designed to be a practical, actionable document—not just abstract theory. Iiar Ammonia Refrigeration Piping Handbook Pdf
Liquid feed lines (recirculated, flooded, and direct expansion) High-pressure receiver piping Oil Management and Return
It provides charts detailing the maximum allowable distance between pipe hangers to prevent sagging and vibration.
: Lines carrying both liquid and vapor (such as wet suction lines in liquid recirculation systems) require careful slope management to ensure smooth fluid movement back to the vessels without creating oil pockets. Material Selection and Welding Standards The is widely regarded as the definitive technical
Detailed tables for vapor and liquid flow capacities, along with formulas for calculating pressure loss.
Requires documented Process Safety Information (PSI), which includes up-to-date Piping and Instrumentation Diagrams (P&IDs) and verification that piping complies with Recognized and Generally Accepted Good Engineering Practices (RAGAGEP).
: Outlines the fluid mechanics of liquid-vapor mixtures returning from pumped evaporators to low-pressure receivers. The vast majority of joints must be butt-welded
The International Institute of Ammonia Refrigeration (IIAR) Ammonia Refrigeration Piping Handbook is the definitive guide for designing, installing, and maintaining closed-circuit ammonia refrigeration systems. Ammonia ( NH3cap N cap H sub 3
Remember: Every weld, every hanger, and every valve tells a story. Make sure your story complies with IIAR. Download the official PDF today and build a safer tomorrow.