Question: Should an Emergency Control Box (e.g. Fireman Dump Box) be installed when constructing a new ammonia refrigeration system in California? Answer: Up until 2007, California used the Uniform Fire Code (NFPA 1) as the model fire code for the state. Since codes are typically revised every three (3) years, the last year that NFPA 1 was a model […]
Question: Can a single relief valve assembly be used to protect more than one ammonia refrigeration pressure vessel? Answer: While it is definitely not common-place, it is compliant to utilize one relief assembly to protect multiple pressure vessels, provided that the relief valves are sized correctly and the vessels are interconnected without allowance for independent isolation. […]
Question: Can a stop valve be installed before or after a relief valve? Answer: If your initial reaction to this question is “NO“, then you are in good company. Most refrigeration experts (and people with common sense) can see the danger in installing stop valves before/after pressure relief valves….However, as is the case with many issues, there […]
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 […]
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