MEO CLASS 4 ORAL QUESTIONS ANSWER

MEO CLASS 4

External - moham

Internal - sirish

FUNCTION 3 SAFETY

BILGE KEEL

•  IT WILL REDUCE THE SHIP'S TENDENCY TO ROLL
• SHIP HAVE ONE MORE BILGE KEEL PER SIDES
• BILGE KEEL INCREASE THE HYDRODYNAMIC RESISTANCE TO ROLLING
• BILGE KEELS ARE PASSIVE STABILITY SYSTEM.

DUCT KEEL

•   DUCT KEEL IS A PLATED BOX KEEL ALLOWING PASSAGE RIGHT FORWARD.
• IT PROVIDES ADDITIONAL BUOYANCY.
• TOGATHER WITH A THROUGH PASSAGE WAY FOR THE CABLES AND PIPLE LINES RUNNING IN THE FORE AND AFT DIRECTION.

MARGIN LINE

• A LINE DRAWN AT LEAST 76 MM BELOW THE UPPER SURFACE OF THE BULKHEADS AT SIDES
• UT DEFINING THE HIGHEST PERMISSIBLE LOCATION ON THE SIDES OF THE VESSEL OF ANY DAMAGE WATER PLANE  IN THE FINAL CONDITION OF THE SINKAGE TRIM AND KEEL 

MARGIN PLATE 

• WHICH IS USED TO LEAD THE FLOW OF WASTE FLUID TOWARDS THE BILGE WELLS ON EITHER SIDES OF THE SHIP.

BALANCED RUDDER

•  ITS THE ONE WITH ABOUT 30% - 40% AREA IS FORWARD OF TURNING AXIS.

STATIC STABILITY

• IS THE ABILITY OF THE SHIP TO REGAIN ITS UPRIGHT EQUILIBRIUM POSITION AFTER REMOVAL OF EXTERNAL FACTOR WHICH CAUSED THE VESSEL TO HEEL AT AN ANGLE IT GIVES THE STABILITY INFORMATION OF A VESSEL UNDER THE CONDITION THAT THE OUTSIDE WATER IS STATIC.

DYNAMIC STABILITY

• THE DYNAMIC STABILITY WITHIN ITS STATIC STABILITY CURVE ITS GIVES US MAGNITUDE OF EXTERNAL HEELING ENERGY THAT THE SHIP CAN ABSORB BEFORE CAPSIZING . THIS MEANS THIS SHIP CAN NOW ABSORB LESS EXTERNAL ENERGY (WIND WAVES CENTRIFUGAL FORCE DUE TO HIGH SPEED  TURNS) BEFORE CAPSIZING.

LEL ( LOWER EXPLOSIVE LIMIT)

•  IT DISPLAYED AS A PERCENTAGE WITH 0% SHOWING A COMBUSTIBLE GAS FREE ATMOSPHERE AND 100% WHEN A GAS IS AT ITS LOWER FLAMMABLE LIMIT. THE PERCENTAGE WILL DIFFER FROM GAS TO GAS.

UFL (UPPER FLAMMABLE LIMIT)

• THE CONCENTRATION OF A HYDROCARBON GAS IN AIE ABOVE WHICH THERE IS INSUFFICIENT AMOUNT OF OXYGEN TO SUPPORT AND PROPAGATE COMBUSTION, SOMETIMES REFERRED UPPER EXPLOSIVE LIMIT.