FREE SURFACE EFFECT

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 FREE SURFACE EFFECT



Definition of free surface effect?

    When a tank or compartment partially filled with liquid, when a ship is inclined. liquid will moves along with ship's inclined  direction. which will reduce the stability of the ship.


How to reduce free surface effect:

  • Swash bulkheads 
  • Pocketing
  • Surface permeability
  • Sluice valves 

Swash bulkheads

This types of bulkheads give some additional strength, Which are longitudinal  bulkheads which will restrict the flow of liquid when ship is  inclined  

Pocketing

 fill the tank fully which will reduce the free surface effect


Surface permeability

The object such as machineries, engine and piping systems prevent the moving water  shifting of wedge, these reducing the free surface effect.


Sluice valves

 The large slack tanks are cross connected with sluice valves, it will reduce  the flow of the liquid so that it will reduce free surface effect.




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