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Development of a Bunker Norm for Ships

Appendix 9

Anticipated Useful Life of Main Components when Running on HFO and MDO

(hours x 1,000)

HFO

MDO

Components

Useful Life

Interval

between

Overhauls

Useful Life

Interval

between

Overhauls

Pistons

Piston ring grooves

Piston rings and

oil control rings

Cylinder liners

Exhaust valves (2x grinding)

Inlet valves (2x grinding)

Valve guides

Rotocaps

Main bearing (groove bearings)

Big-end bearing (groove bearings)

Connecting rod (new generation)

Turbine nozzle ring

Vaporizer for fuel valve

Fuel pump component

Intercooler

Gear transmission

Guide shaft

Guide shaft bearing

Vibration absorber (Teflon bearing)

60

 

12

24 – 36

9 – 15

12 – 18

18 – 24

6 – 12

30

18 – 24

60

18 – 20

4 – 6

12 – 18

60

60

60

60

30 – 40

18 – 24

6 – 12

12 – 18

3 – 5

12 – 18

 

 

 

 

6

1.5

80

 

18

48

24 – 36

24 – 36

18 – 24

12 – 18

40

24

60

6 – 8

24 – 36

60

60

60

60

30 – 40

 

 

12 – 18

12 – 18

12 – 18

12 – 18

 

 

 

 

 

1.5 – 3


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