PRINCIPLES OF NAVAL ENGINEERING 



OIL LEVEL GAGE 



TUBE ^ID 



THERMOMETER 



FOUR-WAY COCK 



FILTER 

 THERMOMETER 



WORM WHEEL 

 -GEAR CASING 





THRUST ELEMENT 



DRILLED PASSAGE- 

 OIL FILLER HOLE 



•BEARING 



RELIEF VALV 



DRILLED PASSAGE 



WATER CONNECTIONS 

 OIL DISTRIBUTOR 

 FLOW INDICATOR 



BEARING 



GOVERNOR 



■ BEARINGS- 



OIL PUMP AND GOVERNOR 

 DRIVE GEARS • 



OIL PUMP 



BEARINGS 



RESERVOIR DRAIN 

 WORM WHEEL SHAFT 



OIL FILTER-COOLER UNIT 



GEAR SPRAY NOZZLE 



'LUBRICATED BY OIL DRAINED FROM GOVERNOR 



Figure 16-7. — Pressure lubrication system for turbine-driven unit. 



38.96X 



The lubricating oil passes through an oil sight 

 flow indicator, a metal- edge type of filter, and 

 an oil cooler. Oil is then piped to the bearings 

 on the turbine shaft, to the governor, and to the 

 worm gear on the pump shaft. The bearings and 

 gear on the oil pump and governor shaft are lu- 

 bricated by oil which drains from the governor 

 and passes back into the oil reservoir. A relief 

 valve is built into the gear casing. This valve 

 serves to protect the system against the dev- 

 elopment of excessive pressures. 



SPEED CONTROL DEVICES 



Different types of governors are used for 

 controlling the speed of auxiliary turbines. The 



discussion here is limited to the constant- speed 

 governor and the constant-pressure pump gov- 

 ernor, both of which are in common naval use,"^ 



Constant-Speed Governors 



The constant- speed governor, sometimes 

 called the speed- regulating governor, is used on 



■^ Additional governingdevices that maybe encountered 

 on recent ships include hydraulic or electric load- 

 sensing governors, for turbogenerators, and pneu- 

 matic, hydraulic, or electric controls for main feed 

 pumps. On ships having automatic combustion and feed 

 water control systems, the main feed pump controls 

 may be related in some way to the boiler controls. 



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