BY TONY LUNDELL, CIRO, PMP, IIAR SENIOR DIRECTOR OF STANDARDS AND SAFETY

IIAR 1: ANSI/IIAR 1-2022 Standard for Definitions and Terminology Used in IIAR Standards is presently in effect. It will be opened up for review starting in mid-2026 for its next revision with a targeted completion with ANSI approval in 2027. Jake Denison serves as the IIAR 1 subcommittee chair and Tony Lundell, senior director of standards and safety at IIAR, is the IIAR staff facilitator. An IIAR 1 future revision considerations (FRC) list has captured suggestions and considerations for its next revision.

IIAR 2: ANSI/IIAR 2-2021 Standard for Design of Safe Closed-Circuit Ammonia Refrigeration Systems is presently in effect. It will be opened up for review in late 2024 for its next revision with a targeted completion with ANSI approval in 2027. Mark Bazis Jr. is the IIAR 2 subcommittee chair, Eric Smith is vice president and technical director at IIAR, and Matt Chojnacki, Tony Lundell, and Eric Smith are the IIAR staff facilitators. An IIAR 2 FRC list has captured suggestions and considerations for its next revision. The IIAR 2 Subcommittee is starting a meeting to review the captured suggestions and considerations to develop responses and make changes if determined are needed.

IIAR 3: ANSI/IIAR 3-2022 Ammonia Refrigeration Valves is presently in effect. It will be opened up for review starting in mid-2026 for its next revision with a targeted completion with ANSI approval in 2027. Michael Trumbower is presently the IIAR 3 subcommittee chair, and Lundell is the IIAR staff facilitator. This standard provides minimum “performance criteria” requirements for ammonia refrigeration valves and strainers that are used in closedcircuit ammonia refrigeration systems. AN IIAR 3 FRC list has captured suggestions and considerations for its next revision.

IIAR 4: ANSI/IIAR 4-2020 Standard for the Installation of Closed Circuit Ammonia Refrigeration Systems is presently in effect. It will be opened up for review starting in early 2025 for its next revision with a targeted completion with ANSI approval within 2025. Brian Alleman is the IIAR 4 Subcommittee Chair. Lundell is the IIAR staff facilitator. An IIAR 4 FRC list has captured suggestions and considerations for its next revision. IIAR 4 will be opened up for its next revision after IIAR 5, IIAR 6, & IIAR 7 2025 revisions are completed.

IIAR 5: ANSI/IIAR 5-2019 Standard for the Startup of Closed-Circuit Ammonia Refrigeration Systems is presently under revision. The IIAR 5 Subcommittee reviewed the comments and questions that were received in the pre-public review. The second (2nd) Public Review ended on October 25, 2024, receiving comments that are being reviewed. A third public review is targeted to occur in late 2024/ early 2025. The IIAR 5 revision is targeted for its completion with ANSI approval in early 2025. Nick Nechay serves as the IIAR 5 subcommittee chair, and Lundell is the IIAR staff facilitator. The revision addresses the standard to harmonize items with IIAR 2, IIAR 4, IIAR 6, and IIAR 7. The third (3rd) public review (less than ½ a page) started on February 21, 2025, and ends on March 23, 2025. The target is to submit IIAR 5, as well as IIAR 6 & IIAR 7, at the same time for approvals to all be 2025 revisions.

IIAR 6: ANSI/IIAR 6-2019 Standard for Inspection, Testing, and Maintenance of Closed-Circuit Ammonia Refrigeration Systems is presently under revision. The IIAR 6 Subcommittee reviewed the comments and questions that were received in the pre-public review. “Functional Testing” of equipment, components, and/ or devices to clarify expected results was included, and an “out of service” section was added to sustain the minimum requirements of IIAR 6 while a closed-circuit ammonia refrigeration system is shut down for an off-season, such as down/off seasons for fruit and/or vegetable harvesting or for down/off seasons for fish catching (seafood). The second public review ended on October 25, 2024, and comments were received that are being reviewed. A third public review is targeted to occur in late 2024/ early 2025. The IIAR 6 revision is targeted for its completion with ANSI approval in early 2025. Jeff Sutton is the IIAR 6 subcommittee chair, and Lundell is the IIAR staff facilitator. The revision addresses the standard to harmonize items with IIAR 2, IIAR 4, IIAR 5, and IIAR 7. The third (3rd) public review (less than five pages) started on February 7, 2025, and ends on March 9, 2025. The target is to submit IIAR 6, as well as IIAR 5 & IIAR 7, at the same time for approvals to all be 2025 revisions.

IIAR 7: ANSI/IIAR 7-2019 Standard for Developing Operating Procedures for Closed-Circuit Ammonia Refrigeration Systems is presently under revision. The IIAR 7 Subcommittee reviewed the comments and questions that were received in the pre-public review. Several discussions have occurred to address regulated (i.e., PSM/RMP systems, larger systems with 10,000 lbs. or more) and non-regulated (i.e., General Duty Clause, smaller systems with less than 10,000 lbs.) sized closedcircuit ammonia refrigeration systems and addressed normative material versus informative/explanatory material. The first public review is targeted to be completed by yearend in 2024, and the ANSI Approval is targeted for completion by early-tomid 2025. Lesley Schafer is the IIAR 7 subcommittee chair, and Lundell is the IIAR staff facilitator. The revision addresses the standard to harmonize items with IIAR 2, IIAR 5, and IIAR 6. The target is to submit IIAR 7, as well as IIAR 6 & IIAR 7, at the same time for approvals to all be 2025 revisions.

IIAR 8: ANSI/IIAR 8-2020 Standard for Decommissioning of Closed-Circuit Ammonia Refrigeration Systems is presently in effect. It will be opened up for review starting in early 2025 for its next revision with a targeted completion with ANSI approval within 2025. Lesley Schafer is presently the IIAR 4 subcommittee chair, and Lundell is the IIAR staff facilitator. AN IIAR 8 FRC list has captured suggestions and considerations for its next revision. IIAR 8 will be opened up for its next revision after IIAR 5, IIAR 6, & IIAR 7 2025 revisions are completed.

IIAR 9: ANSI/IIAR 9-2020 Standard for Minimum System Safety Requirements for Existing Closed-Circuit Ammonia Refrigeration Systems recently had an Addendum A developed to address a scope change and an interpretation, provide a clear compliance deadline, address some simple edits, and provide an informative flow chart. Also, an IIAR 9 Checklist was developed as a tool. It will be opened up for its next revision with a targeted ANSI approval within 2025. Eric Johnston is the IIAR 9 subcommittee chair, and Lundell is the IIAR staff facilitator. IIAR 9 will be opened up for its next revision after IIAR 5, IIAR 6, & IIAR 7 2025 revisions are completed.

CARBON DIOXIDE (IIAR STANDARD):

IIAR CO2: ANSI/IIAR CO2-2021 Safety Standard for Closed-Circuit Carbon Dioxide Refrigeration Systems is presently in effect. Presently, an IIAR CO2 Addendum is under consideration for Relief Device Capacity by a Task Group. The Task Group has been meeting weekly and is considering that it may be most appropriate to propose a hybrid approach toward defining “Mair” requirements. The sections pertaining to the Relief Device Capacity are in Chapter 11, and the informative material is in Appendix A. At this time, the latest material for the Addendum’s proposed approach for consideration is being targeted to be presented at the upcoming Standards Committee Meeting in Phoenix, AZ, on March 2, 2025, during the IIAR 2025 Conference.

After the Addendum consideration is address, the IIAR CO2 Standard will be opened up in mid-2025 for its next full review and full revision. John Collins is the IIAR CO2 subcommittee chair and Lundell is the IIAR staff facilitator.

HYDROCARBONS (STANDARD IN DEVELOPMENT):

IIAR HC: IIAR HC-202x Safety Standard for Closed-Circuit Refrigeration Systems Utilizing Hydrocarbon Refrigerants is a standard presently in development. This standard pertains to utilizing “natural” hydrocarbon refrigerants that have zero ozone-depleting potential and ultra-low global warming potential. The committee reviewed and developed responses to one hundred-sixty-one (161) comments received during the first public review. Joseph Pillis is the IIAR HC subcommittee chair, and Lundell is the IIAR staff facilitator. The IIAR HC’s second public review started on October 25, 2024, and ended on December 9, 2024, which received fifteen (15) comments. Responses to the comments were developed, with nine (9) being “Resolved” on the first pass. Six (6) developed responses that pertain to two commenters are under discussion. Once all fifteen (15) public review #2 comments are resolved/addressed, a third (3rd) IIAR HC public review will occur, showing substantive changes resulting from the second (2nd) public review, which is anticipated to be out in early-to-mid 2025. This standard in development is targeted for ANSI Approval within 2025.