General Arrangement Plan

Lesson 2

General Arrangement Plan  depicts 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 deck   the principal deck of a vessel shelter for contents

b. Forecastle    foremost part of the upper deck usually raised above the main deck location of winches

c. Tweendeck   space between decks – intermediate deck divides the vessel into separate holds

d. Tanktop   inside bottom of the vessel the plating forming the inner bottom of a ship hull

e. Upper hold / Lower hold  spaces that contain the cargoes – storage space

f. Peak tank    foremost and aftermost spaces of the vessel serve as storage spaces for ballast water capable of absorbing part of the impact forces that are released in case of a collision –safety zone

g. Chain locker  storage space for anchor chain

h. Bosun’s locker   = Boatswain’s locker serves as storage for ropes, paint and dunnage

i. Peak bulkheads    watertight collision separations prevent the vessel from flooding in case of collision with another vessel fireproof

j. Engine room    = machinery space watertight compartment houses the main and auxiliary machinery

j. Engine room   on 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 room   location of steering gear gives the power for moving the rudder

l. Double bottom  provides strength and storage space for fuel, lubricating oil, fresh water, salt (ballast) water and potable water

m. Cofferdams   separations – to prevent leaking location of pumps

n. Superstructure    accommodation for the crew and passengers; messroom, galley, pantry wheelhouse

Shipboard terminology for position in a ship          

COLLOQUIAL TERM

fore end after end midships part right side left side in front of behind across (the ship) from stem to stern

M.E. TERM

forward aft amidships starboard s.

port s.

before / forward of abaft / aft of athwartships fore and aft