Volumes and weights

The dimensions of a ship can be expressed by using termsm which descrbe the charateristics of the ship. Each terme has a specific abbreviation. The type of ship determines the term to be used. For instance, the size of a container vessel is expressed in the number of containers it can transport; a roll-on roll-off carrier's size is given by the total deck-area in squre metres and a passenger ship in the number of people it can carry. At the IMO-conference in 1969 the new units "Gross Tonnage" and "Nett Tonnage" were introduced, to establish a world-wide standard in calculating the size of a ship. In many countries the Gross Tonnage is used to determine port dues and pilotage, or to determine the number of people in the crew.

Register ton

To determine the volume of a space the register ton is used. One register ton equals 100 cft. or 2.83 m3.

Gross Tonnage

The gross tonnage is calculated using a formula that takes into account the ship's volume in cubic metre below the main deck and the enclosed spaces above the main deck.

This volume is then multiplied by a constant, which results in a dimensionless number (this means no values of T or m3 should be placed after the number). All distances used in the calculation are moulded dimensions.

In order to minimier the daily expenses of a ship, the ship owner will keep the GT as low as possible.

Nett Tonnage

The Nett Tonnage is also a dimensionless number that describes the volume of the cargo space. The NT ca be calculated from the GT by subtraction the volume of space occupied by:

- crew
- navigation equipment
- propulsion equipment
- workshops

The NT may not be less than 30% of the GT.

Displacement (in m3)

The displacement equals the volume of the part of the ship below the water line including the shell plating, propeller and rudder.

Displacement Δ (in ton)

The displacement is the weight of the volume of water displaced of the ship. One could also say: the displacement equals the total mass of the ship.

Displacement Δ (t) = waterdisplacment (m3) * density of water (t/m3)

Density of fresh water is 1 t/m3;

Density of salt water is 1.025 t/m3.

Biblio: Ship knowldge - A modern encyclopedia

La construction navale

Étrave

Écubier d'étrave

Super structure en alumium 1

Super structure en alumium 2

Gorss tonnage & nette tonnage

Car and Passenger Ferry

1. Becker rudder
2. Controllable pitch propeller
3. Sterntube
4. Ballast tank
5. After engine room with gearbox
6. Seawater inlet chest
7. Forward engine room with 1 of 4 main engines
8. Stern rampe
9. Mooring gear
10. CO2 – battery space
11. Harbour controle room for loading officer
12. Main deck for trailers and double stacked containers
13. Gangway
14. Outside deck
15. Lifeboat hanging in davits
16. Deck 11
17. Funnel
18. Exhaust pipes
19. Panarama loung
20. Officer an crew mess
21. Passenger cabins
22. Fast-recue boat
23. Driver accomadation
24. Upper trailer deck
25. Ramp to lower hold
26. Stabilizer, retractable
27. Shops and restaurants
28. Helicopter deck
29. Entretainment spaces and bars
30. Fan room
31. Heeling tank
32. Void
33. Ro-ro cargo
34. Web Frame
35. Car deck
36. Marine evacuation system
37. Cinema
38. Satellite dome for internet
39. Satellite dome for communication (Inmarsat)
40. Radar mast
41. Officers cabins
42. Wheelhouse
43. Car deck fan room
44. Forecastle
45. Anchor
46. Bulbous bow
47. Bow thrusters

Oper container Ship

1. Rudder
2. Propeller
3. Stem
4. Container with a length of 40 feet (FEU) on a 40′ stack
5. Container with a length of 20 feet (TEU) on a 20′ stack
6. Accommodation ladder
7. Pilot or bunker door

8. Container guide rail
9. Row No. 11
10. Row No. 04
11. Tier No. 08
12. Wing tank (water ballst)
13. Service gallery
14. Fixed stack
15. Movable stack
16. Bay No. 15
17. Bay No. 06
18. Tier No. 86
19. Cells holds 1 an 2, for containers with dengerous, goods (explosives)
20. Container support
21. Breakwater
22. Bulbous bow

Lettres grècques & la pronociation

No.	Maju.	Minu.	Phoné. angaise	Phoné. international	中文注音
1	Α	α	alpha	a:lf	阿尔法
2	Β	β	beta	bet	贝塔
3	Γ	γ	gamma	ga:m	伽马
4	Δ	δ	delta	delt	德尔塔
5	Ε	ε	epsilon	ep`silon	伊普西龙
6	Ζ	ζ	zeta	zat	截塔
7	Η	η	eta	eit	艾塔
8	Θ	θ	thet	θit	西塔
9	Ι	ι	iot	aiot	约塔
10	Κ	κ	kappa	kap	卡帕
11	Λ	λ	lambda	lambd	兰布达
12	Μ	μ	mu	mju	缪
13	Ν	ν	nu	nju	纽
14	Ξ	ξ	xi	ksi	克西
15	Ο	ο	omicron	omik`ron	奥密克戎
16	Π	π	pi	pai	派
17	Ρ	ρ	rho	rou	肉
18	Σ	σ	sigma	`sigma	西格马
19	Τ	τ	tau	tau	套
20	Υ	υ	upsilon	jup`silon	宇普西龙
21	Φ	φ	phi	fai	佛爱
22	Χ	χ	chi	phai	西
23	Ψ	ψ	psi	psai	普西
24	Ω	ω	omega	o`miga	欧米伽

The multi-purpose cargo

1. Rudder
2. Propeller
3. Main engine with gearbox and shaft generator
4. CO2 bottles in CO2 room
5. Man overboard boat (MOB)
6. Free fall lifeboat
7. Crane for MOB, lifeboat, liferaft and provisions
8. Funnel withall exhaust pipes
9. Rear mast with mqgnetic compass and searc light
10. Crosse trees with rqdqrscqnners
11. Topdeck with magnetic compass and search light
12. Accommodation
13. Hatch cradle
14. Heavy fuel oil tank
15. Bulk cargo
16. Vertical bulkhead or pontoon
17. Heavycargo, steel coils
18. Prject cargo
19. Horizontal decks or hatchcovers
20. General cargo, rolls of paper
21. Shear strake
40. Port side
41. Starboard side
22. Hold fan
23. Fixed bulkhead
24. Container pedestal
25. Tanktop, max. load 15 t/m2
26. Containers, 5 rows, 3 bays
27. Vertical bulkhead or pontoon
28. Hatch coaming
29. Wing tank (ballast)
30. Bulk cargo
31. Gangway
32. Stacked hatches
33. Top light, rang light
34. Breakwater
35. Anchor winch
36. Collision bulkhead
37. Deeptank
38. Bow thruster in nozzle
39. Forepeak tank in bulbous stem