IIAR is the world’s leading advocate for the safe, reliable, and efficient use of ammonia and other natural refrigerants as well as an ANSI-accredited standards developer. IIAR is currently the only organization writing design and operation standards specifically for ammonia and other natural refrigeration systems. All IIAR Standards are developed to meet essential requirement criteria set by ANSI. All IIAR Standards must be re-affirmed every 5 years.

IIAR 1 – American National Standard for Definitions and Terminology Used in IIAR Standards. Provides a unified set of definitions for use in the IIAR Standards. Originally published in 2012 and sequentially re-affirmed and published in 2017. IIAR 1 was most recently re-affirmed and published in 2022.

IIAR 2 – American National Standard for Design of Safe Closed-Circuit Ammonia Refrigeration Systems. IIAR 2 is the definitive design safety standard for the ammonia refrigeration industry. Originally developed in 1974. IIAR 2 has seen many updates, addendums, and changes throughout the years. The update in 2014 saw changes that included code language to make IIAR 2 a single comprehensive standard covering the safe design of closed-circuit ammonia refrigeration systems. IIAR 2-2014 Addendum A was published in 2019, addressing ammonia absorption systems. IIAR 2-2021 is the latest re-affirmed and published edition.

IIAR 3 – American National Standard for Ammonia Refrigeration Valves. IIAR 3 specifies performance criteria for materials, design parameters, marking, and testing of valves and strainers used in closed-circuit ammonia refrigeration systems. IIAR 3 was first published in 2012 and was re-affirmed and published in 2017. IIAR 3 was most recently re-affirmed and published in 2022.

IIAR 4 – American National Standard for Installation of Closed-Circuit Ammonia Refrigeration Systems. First published in 2015, IIAR 4 was written to serve as a standard for the installation of closed-circuit ammonia refrigeration systems and overpressure protection relief piping systems. IIAR 4-2020 is the latest re-affirmed and published edition.

IIAR 5 – American National Standard for Startup of Closed-Circuit Ammonia Refrigeration Systems. This standard provides basic minimum requirements for the safe startup of closed-circuit ammonia refrigeration systems and for additions and modifications made to such systems. First published in 2013, IIAR 5-2019 is the latest edition. A review of IIAR 5 has started for its next update and re-affirmation targeted for completion in 2024.

IIAR 6 – American National Standard for Inspection, Testing, and Maintenance of Closed-Circuit Ammonia Refrigeration Systems. This standard provides the minimum requirements for inspection, testing, and maintenance (ITM) tasks and record-keeping applicable to closed-circuit ammonia refrigeration systems. IIAR 6-2019 is the latest edition. A review of IIAR 6 has started for its next update and re-affirmation targeted for completion in 2024.

IIAR 7 – American National Standard for Developing Operating Procedures for Closed-Circuit Ammonia Refrigeration Systems. First published in 2013, IIAR 7 defines the minimum requirements for developing operating procedures for closed-circuit ammonia refrigeration systems and is intended for those who develop, define, and/or review operating procedures for closed-circuit ammonia refrigeration systems. IIAR 7-2019 is the latest edition. A review of IIAR 7 has started for its next update and re-affirmation targeted for completion in 2024.

IIAR 8 – American National Standard for Decommissioning of Closed-Circuit Ammonia Refrigeration Systems. Developed in 2015, IIAR 8 specifies the minimum criteria for removing the ammonia charge in conjunction with the decommissioning (permanent retirement) of closed-circuit ammonia refrigeration systems. IIAR 8-2020 is the latest re-affirmed and published edition.

IIAR 9 – American National Standard for Minimum System Safety Requirements for Existing Closed-Circuit Ammonia Refrigeration Systems. This standard provides a method for existing stationary closed-circuit refrigeration systems using ammonia as the refrigerant to evaluate and document new and revised codes, standards, and practices to determine what provision should be implemented to the existing system. This standard also provides a method for determining and documenting existing equipment designed and constructed in accordance
with prior codes, standards, or practices to ensure practices and system designs remain safe for operation. IIAR 9-2020 is the first published edition.

IIAR CO2 – Safety Standard for ClosedCircuit Carbon Dioxide Refrigeration Systems. This standard provides minimum requirements for safe design, installation, startup, and inspection, testing, and maintenance (ITM) tasks applicable to stationary closed-circuit carbon dioxide refrigeration systems. IIAR CO2-2021 is the first published edition.

In Development: IIAR HC – Safety Standard for Closed-Circuit Refrigeration Systems Utilizing Hydrocarbon Refrigerants is presently in development. This standard will specify minimum requirements for designing safe closed-circuit natural hydrogen refrigeration systems, as well as provide minimum requirements for the safe installation, startup, and inspection, testing, and maintenance of such systems. It is anticipated to be finished in 2023. Your input is welcomed.

Please visit the IIAR Standards Review page on the IIAR website.

All open and ongoing public review cycles are listed with access to review documents and commenting tools. IIAR Standards are available to IIAR members online through the “Members Only” elibrary portal.

When you belong to the IIAR Community, your voice adds impact to our natural refrigeration industry.