While it is well known that good engineering practice requires that relief valves be replaced every five years, industry literature does not clearly state when the five-year timer starts its countdown. Is it when the valve is manufactured? Taken out of the box? Installed? Exposed to ammonia? Due to the lack of clarification on this […]
Since ammonia diffusion tanks were removed from the California Mechanical Code in 2016, atmospheric termination of relief valves has once again become a viable strategy for ammonia refrigeration systems. The question that often arises, however, is what constitutes “safe” termination to atmosphere. ANSI/IIAR 2-2014 §15.5.1 outlines five requirements for proper atmospheric termination: Discharge pipe must […]
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