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 Class – registar, length of voyage, type of voyage, dangerous cargo…. speed class

a. upper deck or main deck b. forecastle c. tweendeck d. tanktop e. upper hold and lower hold f. peak tank g. chain locker h. bosun’s locker i. collision bulkheads j. engine room k. steering machinery l. double bottom m. cofferdams n. superstructure

a. Upper deck or main deck the principal deck of a vessel; in some ships the highest deck of the hull, usually but not always the weather deck; in sailing warships often a deck under the upper deck

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

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

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

g. Chain locker storage for anchor chain

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

i. Collision bulkheads foremost major watertight bulkhead 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 machinery 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 empty spaces / longitudinal and transverse separations between tanks prevent leaking of liquids from one double bottom tank into another

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

Shipboard terminology for position in a ship COLLOQUIAL TERM M.E. TERM fore end forward after end aft midships part amidships right side starboard s. left side port s. in front of before / forward of behind abaft / aft of across (the ship) athwartships from stem to stern fore and aft