FRICTIONAL contact between a rotating steel bolt and a steel rib mesh strand during the installation of a steel rib bolt generated sufficient heat to ignite methane that was present behind the plate at the installation point at a Queensland underground coal mine.
Frictional contact between the rotating steel bolt thread and mesh strand generated heat estimated to be in excess of 300C.
Coal mine workers attempted to rapidly extinguish the burning methane using water but were unsuccessful. They then successfully extinguished the burning methane with portable dry chemical fire extinguishers....
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