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The report detailed failed cylinder valves that were manufactured by NK Co., LTD, Korea prior to 2016. There, a routine, two-year servicing and subsequent inspection found that the total number of empty or partially empty fixed CO2 system cylinders represented a loss of more than 50% of the
supply. analysis determined that variable environmental conditions and fluctuating air cylinder pressures led to a material failure of the copper bursting discs in the cylinder valves.

https://www.register-iri.com/wp-content/uploads/MSA-2023-14.pdf