This is an update to a blog that was originally posted on 4/19/16. You can read the original blog here. ANSI/IIAR 2-2021 §15.3.10 outlines the requirements for providing Hydrostatic Overpressure Protection. In situations where thermal hydrostatic expansion of trapped liquid ammonia could occur, hydrostatic protection must be provided. Per ANSI/IIAR 2-2021 §15.3.10.1, Protection against overpressure […]
Question: Are pressure relief valves required to be installed on an evaporative condenser? This is an update to a blog that was originally posted on 9/10/13. You can read the original blog here. Answer: This is a very good question and one that gets asked frequently. Since an evaporative condenser is not a pressure vessel, […]
This is an update to a blog that was originally posted on 10/4/16. You can read the original blog here. When reviewing an ammonia refrigeration Piping and Instrumentation Diagram (P&ID) and comparing it to the actual refrigeration system, I am often surprised at how often valves have not been physically labeled to match the P&ID. […]
Ammonia refrigeration systems must be equipped with a means of draining oil from the system. Over time, small amounts of oil are carried out of the compressors and mix with the ammonia vapor. The ideal place to collect and drain this oil is on the low pressure side of the refrigeration system. The cold temperatures […]
This is an update to a blog that was originally posted on 5/25/15. You can read the original blog here. New Ammonia Refrigeration Systems For new ammonia refrigeration systems, all vessels and equipment (compressors, condensers, etc.) must follow the component marker requirements in ANSI/IIAR 2-2021 §4.2. The standard states the following in regard to component […]
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