NAVAL TERMS PART 1 MEO class4 orals

 NAVAL TERMS PART 1

Length over all (loa)?

• Greatest length of the ship, measured from forward extreme to aft extreme.

Lenth between perpendicular?

• Distance measured from aft perpendicular to forward perpendicular.

Forward perpendicular?

• The summer load water line cut the stem in one point that point is called forward perpendicular.

Aft perpendicular?

• The summer load water line cut the aft of the rudder post. That point is called aft perpendicular.

Breadth extreme?

• The greatest breadth  of the ship measured from outside if the ship's shell.

Breadth module?

• The distance measured from inside of the ship's shell.

Depth extreme?

• The distance measured from top of the deck to bottom of the keel.

Depth module.?

• The distance measured from bottom of the deck to top of the keel.

Draught extreme?

• The distance measured from water line to top the deck.

Draught module?

• The distance measured from water line to bottom of the deck.

Free board?

• Distance from waterline to top of the deck.

Camber ?

• The transverse curve of the deck fromm center line  to side shells.
• Purpose is to drive the water outside.

Sheer?

• The curvature if the deck from mid ship to forward and aft.
• Forward is more higher than aft . For sea worthiness.

Rise of floor?

• The bottom shells of the ship  is slightly slipped from keel to bilge.

Bilge keel?

• The curvature of the arc from bilge to keel.

Tumble home?

• For some ship's side shells are slightly inverted facing centre line this is called tumble home.

Flare?

• Opposite to tumble home 
• Outside curvature if the side shells, for present in the forward region of the ship. 
• INCREASE BUOYANCY
• ALLOW THE ANCHOR.

Displacement?

• Mass of the ship is equal to the mass if the volume if water displaced.

Tpc- tonnage per centimetres?

• Mass required by the ship is to increase it mean draught by one centimetre.

Metacentric height?

• Distance between g and m.

What is metacentric?

•  When a ship is heels, the centre of buoyancy and centre of gravity moves latterly, that new point at which draw the imaginary vertical line. It will cut the original line that point is called metacentric.

Water plan area of co-efficient?

• The ratio of water plane area  to the product of length and breadth of the ship.

Mid ship section area of co-efficient?

• The ratio of immersed portion og the mid ship yo the product of breadth and drought.

Black coefficient?

• The ratio of underwater volume of the ship to the product of rectangular having some length draught and breadth.

Prismatic coefficient?

• The ratio of volume of displacement at a certain draught to the product of length and area of cross section at mid ship.

Shell expansion plan ?

• Is the 2d diagram of 3d surface og ship's hull.

Wetted surface area?

• Is the area of the ship's hull and other things attached (like propeller rudder) its the wetted surface area.

Center of gravity?

• It is a point complete ship's weight may act.

Center of buoyancy?

• Its is the point complete upthrust force may act.

Propeller pitch?

• One revolution of the shaft in which the propeller may moves forward in certain distance.

Diameter if the propeller?

• The dia of the propeller is a circular which cut the tip of tha blades.

CHOCKS AND HOLDING DOWN BOLTS MEO CLASS4

 CHOCKS & HOLDING DOWN BOLTS  is used fix the bef plate to the tank top.

Functions:- 

• any variation in tank top will not affected to engine, 
• To avoid the misalignment of engine.
• End chock will absorb vibration and noise of engine & trust.
• Side chock absorb unbalanced forces due to the rotating parts of engine.

MATERIALS.

• CAST IRON
• EPOXY RESIN (mostly used)

Cast iron

•  Required experts for installation.
• And high expensive

Epoxy resin 

• Cost effective
• Non corrosive
• 100% contact even rough surface.

Fixing of EPOXY RESIN chocks.

• Clean the surface
• Prepare chocks mixture
• Prepare die or dam for chocks 
• Fix holding down bolts, And power mixture around the insert the bolts 
• Note the temperature of the mixture (not more than 25°c)
• Tight the holding down bolts with hydraulic jack with required pressure.
• Dry upto 48hours.

BED PLATE MEO CLASS4

 Bed plates are in foundation of engine, and which is responsible for strength a d rigidity of other components of engine.

Material 

FABRICATED STEEL 

Forces acting on bed plate 

• GAS PRESSURE
• INERTIA FORCE OF MOVING PARTS
• HULL DEFLECTION.
• THERMAL STRESS 

Mitsubishi selfjector G series sludge discharge mechanism

 

NEW AMMENDMENTS MMD ORALS

 Ballast water management:

•  Must have approved ballast water management plan.
• Approved ballast water treatment plant.
• Must carry ballast water record book 
• International ballast water management certificate.
• Must install ballast water treatment plant.

Mlc2006

•  SEAFARERS employment agreement.
• Payment of wages.
• Ship board harassment 
• Health and safety of SEAFARERS.

Solas and marpol.

• Data consumption system for fuel oil on ship more than 500gt and above.
• BND every bunker specified the sulphur content.
• Inclusion of BALTIC SEA and North sea into ECA nox area.
• Global sulphur limit. 0.5mass/mass
• Energy efficiency design index.
• Maintain electronic record book.
• Blatic sea special area for passanger ship annx4
• Passanger ship must be fitted with RRS (release and retrieve system)
• All ship must have communication instruments. Designed for fire fighting team atleast 2 for each fire party.
• Audible alarm device notify low level air pressure in scba .
• 135 letter extinguishers not required for BOILER. Which is protected with local fire fighting System.
• Helicopter area must be protected with foam application system.
• application code on noise level onboard  ship.
• Ammendment to damage stability requirements.
• Damage control drills on passanger ship 
• Digital mobile satelite system.
• Control and discharge of  RESIDUALS of NOXIOUS LIQUID substance.

Crank case safety arrangements

 

Basic rules of crank case Safety arrangements

• Crank case and inspection door should be exhibiting strengthen construction.
• Should be fitted with one or more non return  relief  valves in each cylinder of crank case. And these valve should be arranged as their outlets protected from flame discharge in case of explosion 
• Total clear area  through the relif valves should not less than 9.30cm2/m3 gross crankcase volume.
• If engine is  not more 300mm cylinder bore with strongly constructed crankcase. 
• If such engine not more than 150mm cylinder bore. No needs to fitted with relief valves.
• Lub oil drains pipe from the sump to drain tank must be extended to well below the working oil level in the tank.
• If multiple engine installation. Drain and vent  arranged  so that flame of explosion can't pass from one engine to another engine.
• Diaphragm must be fitted near mid length to prevent the passage of flame.if the engine having more than 6 cylinder.