The Iron and steel magazine . th acid and basic fur-naces, differences occurring in the character of the materialsforming the hearth linings. Generally the furnaces are of thestationary type. In some plants will be found furnaces of therolling or tilting kinds, each having some good points in itsfavor. From the viewpoint of cheapness of construction, thestationary furnace holds the ground. Movable hearth typescall for costly mechanical installation not required in stationaryunits. A potent argument in favor of the movable (rolling ortilting) furnace is the ability offered to completely drain t
The Iron and steel magazine . th acid and basic fur-naces, differences occurring in the character of the materialsforming the hearth linings. Generally the furnaces are of thestationary type. In some plants will be found furnaces of therolling or tilting kinds, each having some good points in itsfavor. From the viewpoint of cheapness of construction, thestationary furnace holds the ground. Movable hearth typescall for costly mechanical installation not required in stationaryunits. A potent argument in favor of the movable (rolling ortilting) furnace is the ability offered to completely drain thehearth at the end of a melt, thus emptying any pools that mayform in the bottom due to excessive scorification, and the easewith which they can be readily repaired with proper stationary furnaces much time is lost, with much discomfort * The Foundry, February, 1906. 224 The Iron and Steel Magazine to the workmen in emptying pools or puddles by means ofrabbles or scrapers. They cannot be thoroughly drained by. such means, and the subsequent patching may or may not besatisfactorily accomplished. The patching may become loos-ened in a succeeding melt. Such difficulties are more liable to Open Hearth Steel Castings 225 happen in basic bottoms than on acid. Another argumenl infavor of the movable furnaces is that the tapping hole troublesare eliminated. In stationary furnaces difficulties and annoy-ing delays arc encountered through hard-taps as a resultof the materials used to temporarily close the tapping holebecoming fused or hardened and. offering great resistance totools necessary to open it at the proper time. In well orderedplants such difficulties are a rare occurrence, but still the riskexists. With a movable furnace the tapping hole is nevertamped or closed, so that there is always the assurance that themetal can be drawn off when desired. Against these favorableconsiderations is the comparatively heavier first cost of themovable furnaces over the station
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Keywords: ., bookcentury1800, bookdecade1890, bookidironsteel, booksubjectiron
