Since 1994, ammonia refrigeration systems subject to the requirements of the Uniform Mechanical Code or California Mechanical Code have been required to install an Ammonia Diffusion Tank for the purpose of relief valve termination. Originally, the codes required the following: 1994 UMC §1119 Ammonia Discharge Ammonia systems shall be provided with an emergency discharge into a tank of water provided exclusively for […]
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: Are pressure relief valves required to be installed on an evaporative condenser? Answer: This is a very good question and one that gets asked frequently. Since an evaporative condenser is not a pressure vessel, it is not a black and white requirement as it is for the vessels throughout a refrigeration system. However, the condenser has […]
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