Chapter 12- PROPULSION STEAM TURBINES 



HIGH 



PRESSURE 



VALVES 



2 HIGH PRESSURE STEAM 



V////A INTERMEDIATE PRESSURE STEAM 

 I LOW PRESSURE STEAM 

 EXHAUST STEAM 



147.98 



Figure 12-23,— Flow of steam in Type IV propulsion 

 unit (cruising turbine in use). 



the operating personnel. The fuel performance 

 ratio is the ratio of the am.ount of fuel oil used 

 as compared to the amount of fuel oil allowed 

 for a certain speed or steaming condition. 

 The fuel performance ratio, which is reported 



on the Monthly Summary, is a general indica- 

 tion of the ship's readiness to operate eco- 

 nomically and within established standards. In 

 determining the economy of a ship's engineer- 

 ing plant, the same consideration is given to 



337 



