Fuel Oil System of ships

Fuel Oil System of ships

1- The fuel oil system is the heart of marine

     diesel engine.

2-  System design depends on type of fuel that

      require balance of the following:

           ·      Reduced space and weight.

           ·      Increased reliability.

           ·      Lower wear part.

           ·      Good cold starting capability.

           ·      Increased safety in fuel handling and safety.

Fuel Selection Consideration

•                        Specify by owner or ship designer.
•                        Fuel price and availability.
•                        Maintenance consideration.
•                        Engine size and design.
•                        Speed and load range.
•                        Frequency of speed and load range.
•                        Ambient temperature.

Fuel types

- Heavy fuel -> mostly continuous operation

- Diesel oil -> maneuvering

ASTM 1D-volatile distillate for high speed engine- flashpoint of

140F

ASTM 2D-Distilate fuel oil of lower volatile – flash point of 140F

ASTM 4D-FUEL OIL FOR LOW AND MEDIUM SPEED ENGINE

MIL-F-16884-Marine diesel fuel for military application- similar to

2D

MIL-T-5524-Marine turbine fuel for military application- similar to

1D

JP 5 – expensive, use one grade of distillate in tankers.

MIL-F- cannot be use for marine application.

Fuel oil System

Fuel oil System

Fuel Oil System

1 - Parts-> Fuel supply & Fuel injection

2 - Fuel journey starts from double bottom tank (storage) -> settling tank (+heating)->

centrifuge (cleaning) ->daily tank (ready for

engine use).

3 - Daily service tank -> 3 way valves -> mixingtank

4 -Booster pump -> heaters (heat engine before starting) ->viscosity regulator (control fuel oil temperature) ->engine driven fuel pumps ->fuel injector (@high pressure)