![]() ![]() The first thing to understand is that any time you trap a high-volume percentage of refrigerant as a liquid, you are creating a scenario where excessive pressures could develop. The goal of this article is to shed some light on why these regulations exist and what situations require caution. ![]() Fewer of us are familiar with the possible consequences of trapping refrigerant in condensers, evaporators and piping. Those who work on refrigeration systems may also be familiar with the regulations surrounding liquid storage in high-pressure receivers – a maximum 90 percent liquid by volume, according to the CSA B52 Mechanical Refrigeration Code. Most of us are familiar with the rules about filling refrigerant recovery tanks and propane tanks – usually to 80 percent maximum liquid by volume. Trapping or isolating refrigerant can be dangerous if it is done with too much liquid present. This hydrostatic expansion resulted from isolating an evaporator.
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