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“A ship displaces a weight of water that is equal to its own weight.”
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“Length over all” (L.O.A.) is the total length of the vessel.
Length Between Perpendiculars (LPP) is measured between the fore perpendicular (fpp) and the aft perpendicular (app).
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5.53M
Category: industryindustry

Ship measurement

1. Dia 1

mu

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

sound

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

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When Buoyancy (B)
is equal to Gravity (G)
the vessel will float.
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The weight of a vessel and her contents,
or
the weight of the displaced watermass.
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• Gross tonnage equals the entire volume of
the enclosed spaces of the ship.
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• Net tonnage can be calculated by deducting
the spaces that are not used for cargo from
the gross tonnage.
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• Harbour dues are usually calculated according
to the gross tonnage, but some ports use the
vessel’s net tonnage.
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• 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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soun
By bale space is meant the volume of the
cargo holds that can be used for general cargo.

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

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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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The Construction Waterline (CWL) or Summer Loadline
is the line to which the ship may be loaded in summer.
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The fore perpendicular is the vertical line through
the intersection of the CWL and the stem.
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The aft perpendicular goes through
the rudderstock.
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Horizontal distance
between the insides of
the moulds (A-B).
A
B

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

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

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

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

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

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

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