Lesson 2

General Arrangement Plan

General Arrangement Plandepicts the division and arrangement of the ship

side view

plan views of the most important decks

cross-sections

The views and sections display:

division into compartments (tanks, engine room, holds)

location of bulkheads

location and arrangement of superstructure

parts of the equipment (winches, loading gear, bow thruster, life boats)

Basic data included in the GAP:

dimensions

volumes of the holds

tonnage

deadweight

engine power

speed

class

Spaces and separations

Spaces and separations

a. upper deck or main deck (sep.)b. forecastle (sep.)c. tweendeck (sep.)d. tanktop (sep.)e. upper hold and lower hold (sp.)f. peak tank (afterpeak/forepeak) (sp./sep.)g. chain locker (sp.)h. bosun’s locker (sp.)i. peak-bulkheads (sep.)j. engine room (sp.)k. steering gear room (sp)l. double bottom (sp.)m. Cofferdams (sp./sep.)n. Superstructure (sp.)

a. Upper deck or main deckthe principal deck of a vesselshelter for contents

b. Forecastleforemost part of the upper deckusually raised above the main decklocation of winches

c. Tweendeckspace between decks – intermediate deckdivides the vessel into separate holds

d. Tanktopinside bottom of the vesselthe plating forming the inner bottom of a

ship hull

e. Upper hold / Lower holdspaces that contain the cargoes – storage

space

f. Peak tankforemost and aftermost spaces of the

vesselserve as storage spaces for ballast watercapable of absorbing part of the impact

forces that are released in case of a collision –safety zone

g. Chain lockerstorage space for anchor chain

h. Bosun’s locker= Boatswain’s lockerserves as storage for ropes, paint and

dunnage

i. Peak bulkheads watertight collision separationsprevent the vessel from flooding in case of

collision with another vesselfireproof

j. Engine room= machinery spacewatertight compartmenthouses the main and auxiliary machinery

j. Engine roomon a large percentage of vessels engine

room is located near the bottom, and at the aft

usually comprises few compartments - this design maximizes the cargo carrying capacity of the vessel and situates the prime mover close to the propeller, minimizing equipment cost and problems posed from long shaft lines

k. Steering gear roomlocation of steering geargives the power for moving the rudder

l. Double bottomprovides strength and storage space for

fuel, lubricating oil, fresh water, salt (ballast) water and potable water

m. Cofferdamsseparations – to prevent leakinglocation of pumps

n. Superstructureaccommodation for the crew and

passengers; messroom, galley, pantrywheelhouse

Shipboard terminology for position in a ship COLLOQUIAL TERM M.E. TERMfore end forwardafter end aftmidships part amidshipsright side starboard s.left side port s.in front of before / forward ofbehind abaft / aft ofacross (the ship) athwartshipsfrom stem to stern fore and aft