ANSI/IIAR 7, “Developing Operating Procedures for Closed-Circuit Ammonia Refrigeration Systems,” defines the minimum requirements for developing operating procedures for closed-circuit ammonia refrigeration systems. First issued in June 2013, work began on periodic maintenance of this standard in February 2017 and was completed in April 2019.

The standard was first approved as an American National Standard by the American National Standards Institute (ANSI) in August 2013 as ANSI/IIAR 7-2013. ANSI requires reaffirmation or revision for periodic maintenance requirements of existing standards every five years. Informative Appendix A was added to provide explanatory information related to provisions in the standard.

Sections of the standard with associated explanatory information in this appendix are marked with an asterisk after the section number, and the associated appendix information is located in a corresponding section number preceded by "A."

In related news, IIAR 6 has been added to the suite of ANSI-approved IIAR standards. It establishes the minimum requirements for inspection, testing and maintenance (ITM) applicable to safe closed-circuit ammonia refrigeration systems. The standard is intended to aid in identifying what components should be inspected, tested and maintained and how frequently these tasks should be performed.