1. General Arrangement Plan
Lesson 2

2. General Arrangement Plan
depicts the division and arrangement of the ship
side view
plan views of the most important decks
cross-sections

3. 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)

4. 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

5. Spaces and separations

6. 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.)

7. a. Upper deck or main deck
the principal deck of a vessel
shelter for contents

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

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

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

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

12. 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

13. g. Chain locker
storage space for anchor chain

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

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

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

17. 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

18. k. Steering gear room location of steering gear
gives the power for moving the rudder

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

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

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

22. 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