. American engineer . rom reaching the steamchest and cylinders, will greatly lengthen tlie life of the valvesand pistons, prevent breakage of the cylinder heads from waterpressure, and also lengthen the life of the boiler. Another featurewhich favors the boiler in tlie use of superheated steam is thecomparatively low boiler pressure which may be carried. Thesize of the cylinders is not limited, as in the saturated steamengines, where the diameter of the cylinders must l)e limited inorder to reduce condensation. Standard recommendations forboiler pressures to be used in connection w-ith superl
. American engineer . rom reaching the steamchest and cylinders, will greatly lengthen tlie life of the valvesand pistons, prevent breakage of the cylinder heads from waterpressure, and also lengthen the life of the boiler. Another featurewhich favors the boiler in tlie use of superheated steam is thecomparatively low boiler pressure which may be carried. Thesize of the cylinders is not limited, as in the saturated steamengines, where the diameter of the cylinders must l)e limited inorder to reduce condensation. Standard recommendations forboiler pressures to be used in connection w-ith superlieaters are180 lbs. for freight engines and 200 lbs. for passenger bad water districts even lower boiler pressures may l)e usedwith correspondingly enlarged cylinders. The requirements for an efficient and practicable fire tube superheater may be summed up as follows: An integral headerwhich is out of the way, in no way obstructing the front end orinterfering with the maintenance of the boiler tubes, and so. Fig. 3—Front End Arrangement with a Fire Tube Superheater andOutside Steam Pipes. designed as to cause the least tendency toward wire drawing ofthe steam: the superheater pipes should lie easily accessible and
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
