EE STRUNG OUT A CUTTING TORCH, TURNED ON THE FUEL GAS (PROPANE) AND LIT THE TORCH. HE THEN OPENED THE OXYGEN VALVE. WHEN HE DID SO THE OXYGEN FEED LINE EXPLODED. A FIRE RESULTED AT THE HOSE REEL WHICH WAS EXTINGUISHED WITH A HAND HELD DRY CHEM. EXTINGUISHER.