Slide (25 of 85)
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This shows the Caterpillar 3306 diesel engine. The power packages of permissible diesel machines are designed and constructed to guard against ignition of methane and coal dust by the hot engine and its components, surfaces, and by the internal combustion of the engine. A permissible machine is equipped with flame arresters on both the intake air and exhaust gas systems of the engine. The exhaust flame arrester on this machine is the water scrubber. The flame arresters quench flames that could be produced by an ignition of methane inside the engine, before the flames could propogate to an explosive environment. The portions of the intake and exhaust systems extending from the engine to the intake and exhaust flame arresters are manufactured and approved as explosion-proof and need to be maintained as such. Joints in these portions of these systems are secured with close tolerance fits and must be maintained. On permissible diesel machines, either flanged metal-to-metal joints or flanges fitted with metal or metal-clad gaskets are used. The explosion-proof joints on the Wagner scoop are equipped with metal-clad gaskets. All joints are to be secured tightly in place at all times using fasteners and lock washers, or other locking devices. Joints are to be checked weekly with appropriately sized feeler gauges.
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