The 2021 edition of IIAR Standard 2 has improved clarity on the minimum requirements for protecting equipment and piping from hydrostatic overpressure. The term “hydrostatic overpressure” refers to the pressure exerted when trapped liquid is subject to thermal expansion. Common components in ammonia refrigeration systems that may be subject to hydrostatic overpressure include: Oil coolers […]
In 2021, IIAR published a new edition of their flagship standard ANSI/IIAR 2 which addresses the requirements for designing a safe ammonia refrigeration system. Machinery room ventilation is one of the many important topics addressed within Standard 2. While the requirements have not changed substantially since the 2014 edition, we have put together this blog […]
With the recent publication of ANSI/IIAR 2-2021, it seemed appropriate to post a blog summarizing the minimum ammonia detection requirements for new ammonia refrigeration systems. Machinery Rooms Ammonia detection inside machinery rooms is addressed in §6.13. At minimum, machinery room ammonia detection must include: At least two detectors with identical sensing ranges must be installed. […]
We’ve written about NFPA 704 placards on ammonia refrigeration systems in the past, but it seemed timely to provide an update since ANSI/IIAR 2-2021 was recently published and includes a noteworthy change in the minimum requirements. What’s the Same? The 2021 version of Standard 2 still requires that an NFPA 704 placard be affixed to […]
IIAR Bulletin No. 114 has been an important resource for the ammonia refrigeration industry since the early 1990’s. In the 2021 edition of IIAR Standard 2, the entirety of Bulletin No. 114 is incorporated as informative Appendix Q. This means that IIAR’s guidance on ammonia refrigeration labeling will no longer be available through a standalone […]
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