Thrust journal: Installed on both side of the bull gear. Its redial portion is white-metal casted for journal bearing and its axial face is equipped with same metal for thrust bearing.
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Thrust bearing consists of a group of table landed metal pads casted on the axial face of the metal body. Thrust metal pads have tapered portion to introduce lubricating oil to thrust bearing face. Because of the direction of the taper, the position of thrust bearing in the gear box are definitely determined to match their oil flow direction to the rotating direction. The position of the thrust bearings are not interchangeable Arrow mark is inscribed on the flanged side face of the bearing case to show the oil flow direction, this is, the rotating direction of the bull gear.
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Thrust bearing us bi-sected typed.
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Air seal is labyrinth type seal with eleven serrated edges. Air seal is installed to back side of each scroll and has small clearance to the pinion shaft. It is bi-sected horizontally and assembled by assembling screws on spit face and fixed to the scroll by fixing screws on flanged face.
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Oil seal is labyrinth type seal with five serrated edges. Oil seal us bi-sected horizontally and each half piece is placed in recesses in gear box and gear box cover. Oil return hole gear box is drilled at lower side of lower half piece.
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3.2 Inter cooler and After Cooler:
Inter cooler consists of tube bundle and shell. Tube bundle is a group of tube fixed to tube plates at both end and many thin plate fins are attached to tubes to have much larger cooling are. Shell has a partition at upper side to prevent hot inlet air from mingling with cool outlet air. Shell has a covers on water side. Cover has water inlet and outlet nozzle with separating partition at the middle portion.
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Cooling water enter into the cover and goes through a half group of tube, then reverses its direction in the head cover and this time goes through the other half group of tubes and leave the cooler from the water outlet nozzle.
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Hot air from a previous stage enters into shell and passes through spaces between group of tube and plate fins thus giving heat to tube bundle and enters into a next stage. While cooling down, the air separates excessive moisture as drain. Drain gathers at bottom of shell and pours into automatic drain trap where it is discharged to drain outlet piping. After cooler is of the same construction as inter cooler.