#7 Filter and centrifuge

Question 1

Fuel Oil System

Answer 1

Bunker Tank-> Settling Tank-> Strainer Wire Mesh-> Centrifugal Purifier-> Service Tank-> Heater-> Fine Filter (Wire Mesh or Auto Clean)-> Main Enginge

Question 2

Auto Klean Filter

Answer 2

Self cleaning
Desiged because servicing of wire-mesh filter time consuming
Dirty if the differential pressure between the pressure guages increases
only hand wheel need to be turned, which cuts the dirt and collects at bottom of cylinder

Question 3

Bunker Tank

Answer 3

Store oil onboard ships

Question 4

Settling Tank

Answer 4

Quantity Comparable small
for the day use
Gravity Separation takes place (impurities separate out due to difference in gravity)
* Aided by heating oil when viscoisty gets lowered and difference increases

Question 5

Disadvanatge of Filtration & Gravity Separation

Answer 5

Filters: ineffective if small particle size or oil contain water as an impurity
Gravity: ineffective if small quantities of water or small particles of solid

Use centrifugal separation instead

Question 6

Centrifugal Separation

Answer 6

1. Mixture put into cylinder and spin
2. Heavier liquid fly out further and rotate at a greater radius
3. Liquid come out at different points

Centrifugal force used, Done in an centrifuge (or purifier)