Summary In December 2016, a roof collapse resulted in a release of approximately 24,000 lbs of ammonia. Two (2) ceiling-suspended evaporators were hung from the roof and fell to the ground when the structure collapsed. Incident Description During a heavy rainstorm, the roof over a cold storage room collapsed. Two (2) ceiling-suspended evaporator coils fell […]
Summary In September 2014, the termination of a relief valve to the atmosphere resulted in a release of approximately 2,700 lbs of ammonia. During the release, a roof-mounted exhaust fan pulled ammonia vapor into a highly populated room in the processing facility which exposed 34 employees to ammonia. Incident Description One of the relief valves […]
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, […]
Summary In July 2017, the termination of a relief valve to the atmosphere resulted in a release of approximately 1,500 lbs of ammonia, and four personnel injuries. Proper operating procedures were not followed during a seasonal startup of the ammonia system. Several mistakes were made which resulted in the high pressure receiver overpressurizing, and the […]
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. […]
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