Ship measurement

1. Dia 1

mu

2. “A ship displaces a weight of water that is equal to its own weight.”

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3. Dia 3

Therefore …...
a vessel will experience
an upthrust that is equal
to the weight of the
displaced water.
Displacement

4. Dia 4

When Buoyancy (B)
is equal to Gravity (G)
the vessel will float.
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5. Dia 5

The weight of a vessel and her contents,
or
the weight of the displaced watermass.
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6. Dia 6

• Gross tonnage equals the entire volume of
the enclosed spaces of the ship.
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7. Dia 7

• Net tonnage can be calculated by deducting
the spaces that are not used for cargo from
the gross tonnage.
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8. Dia 8

• Harbour dues are usually calculated according
to the gross tonnage, but some ports use the
vessel’s net tonnage.
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9. Dia 9

• By deadweight is understood the weight of
the vessel’s contents:
cargo bunkers - ( fuel / lubricating oil /
ballast water / fresh water/
potable water)
equipment stores.
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10. Dia 10

soun
By bale space is meant the volume of the
cargo holds that can be used for general cargo.

11. Dia 11

By grain space is meantthe volume of the
cargo holds that can be used for bulk cargo.
S

12. Dia 12

Ullage – the free space above the liquid in a
tank, which is measured in metres or feet.
By Oil Space is understood 98% of the total
volume of the wet bulk tanks.

13. “Length over all” (L.O.A.) is the total length of the vessel.

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14. Length Between Perpendiculars (LPP) is measured between the fore perpendicular (fpp) and the aft perpendicular (app).

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15. Dia 15

The Construction Waterline (CWL) or Summer Loadline
is the line to which the ship may be loaded in summer.
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16. Dia 16

The fore perpendicular is the vertical line through
the intersection of the CWL and the stem.
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17. Dia 17

The aft perpendicular goes through
the rudderstock.
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18. Dia 18

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19. Dia 19

Horizontal distance
between the insides of
the moulds (A-B).
A
B

20. Dia 20

Vertical distance
between the insides of
the moulds (A-B).
A
A
B
B

21. Dia 21

By beam is meant the
extreme breadth of the
vessel (A-B).
A
B

22. Dia 22

Distance from the bottom
of the keel to the surface
of the water (WL - K).
WL
A
B
K

23. Dia 23

H
WL
A
B
Distance from the waterline
to the highest point of
the vessel (WL - H).

24. Dia 24

Distance between deckline
and waterline (DL - WL).
DL
A
B
WL

25. Dia 25

Distance between keel
and sea-bed (K - B).
K
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B

26. Dia 26

The
International Maritime Language Programme – IMLP
C
The IMLP is an IMO-standard.
P.C. van Kluijven