After years of hard work, IIAR has recently published two (2) new refrigeration standards: ANSI/IIAR 4-2015 Installation of Closed-Circuit Ammonia Refrigeration Systems ANSI/IIAR 8-2015 Decommissioning of Closed-Circuit Ammonia Refrigeration Systems In this blog and the next, I will summarize each of the standards and provide excerpts that are important to be aware of. Be sure […]
Question: What is the correct NFPA 704 placard for an ammonia refrigeration system? Answer: This question has caused enormous confusion in the ammonia refrigeration industry, so I will attempt to bring some clarity to the issue. ANSI/IIAR 2-2008 Addendum B §13.1.10.4 requires that “Refrigerating systems shall be provided with approved informative signs, emergency signs, charts and […]
Question: What is the proper procedure for selecting the pressure relief valve capacity for a positive displacement compressor? Answer: ANSI/IIAR 2-2008 Addendum B §6.1.2.1 addresses this very question. Furthermore, Appendix E (Informative) of that same document gives a detailed example of one acceptable method for determining the proper capacity. A summary of the steps in Appendix […]
Question: I’ve heard that the ammonia pipe labeling requirements have changed. Is that true? Answer: Yes and No. It is true that IIAR updated Bulletin No. 114 Identification of Ammonia Refrigeration Piping and System Components in March 2014. The update includes a fundamental change that we will address in this blog. Before doing that, however, it is important that we unpack […]
There seems to be a lack of clarity regarding the frequency that Mechanical Integrity inspections must be performed on ammonia refrigeration systems and more specifically whether a 5-year MI inspection is required by the PSM regulation. Title 29 CFR §1910.119(j)(4)(iii) requires that “the frequency of inspections and tests of process equipment shall be consistent with applicable manufacturers’ recommendations and good engineering practices, […]
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