Eli Macha presented a technical paper at the 2021 RETA National Conference titled IIAR 6: Should I Hire a Contractor or Keep it In-House? This blog series includes excerpts from his technical paper. One of the most common questions posed to process safety consultants is, “Do I need to hire a contractor?” This [blog series] […]
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 […]
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