refrigerant piping systems must be able to withstand being in an absolute vacuum.) The following list is a sample of the types of requirements outlined in B31.5: This code is the main standard used in our industry to determine the design requirements for refrigerant piping. It is important to note that in many (if not all) jurisdictions in Canada CSA B52 is not a legal requirement for small systems, usually under three tons, and even though it can be used for residential type equipment, its scope specifically excludes single system air conditioning for private dwellings.ĪSME B31.5, first published in the early 1960s, is part of a series of piping codes produced by the American Society of Mechanical Engineers (ASME) that detail the design fabrication and assembly and examination, inspection, and testing of refrigeration piping and heat transfer components. However, CSA B52 requires that refrigerant piping installations comply with a different code, ASME B31.5. In Canada, CSA B52 is usually the code that is used for mechanical refrigeration installations. One of the ways that we make sure piping is safe is by following engineering and design standards and codes. As CO2 systems become more popular and as our industry continues to acknowledge the seriousness of leaks, from an environmental perspective with Halocarbons and from a safety perspective with ammonia, reducing failures is becoming more important. Industrial and ammonia mechanics are familiar with carbon and stainless steel since ammonia reacts with copper, making it an unsuitable material to use. We have discussed some of the issues and challenges regarding piping in previous articles and will drill into a few more topics here.įor most refrigeration mechanics and technicians, ACR copper tubing is the only piping material encountered. Refrigerant piping is obviously a very important component of refrigeration systems. Failed insulation is indicated by significant frost build-up on the freezer piping.
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