On January 25, 2011, MSHA issued an Equipment Alert regarding a catastrophic failure that occurred in an oxygen cylinder fitting in an A. L. Lee refuge alternative in an underground coal mine. The investigation revealed that the failed fitting did not meet the dimensional specifications of the applicable Compressed Gas Association (CGA) standard, CGA-701. Mine operators are working with A. L. Lee to identify and replace any other fittings that do not meet the CGA dimensional specifications. The Alert also mentioned the discovery of a second failed fitting in another refuge unit. This update provides recently obtained information related to this second failed fitting, as well as information related to recently identified cracks in brass cylinder valves and fittings in a third refuge alternative.
Attached below are the January 25th Alert and the February 10th Altert Update.
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