SHIP’S MEASUREMENT
Lesson 3
0. Basic vocabulary 1
0. Basic voacbulary 1 - answers
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1. length
2. height
3. width
4. depth
5. diameter
6. thickness
7. area
8. volume
0. Basic vocabulary 2
0. Basic vocabulary 2 – answers
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length – long
width – wide
height – high
depth – deep
thickness - thick
0. Baisc vocabulary 3
1. General – Units of measurement
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In engineering 3 types of METRIC UNITS are used:
1. BASIC METRIC UNITS refer to LINEAR DIMENSIONS, i.e.
those which can be measured in a straight line and are:
a)
b)
c)
d)
e)
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LENGTH
HEIGHT
WIDTH or BREADTH
THICKNESS
DEPTH
Other basic units as KILOGRAMME, SECOND, RADIAN are used
to describe physical quantities as MASS, TIME, ANGLE
1. General – Units of measurement
2. DERIVED METRIC UNITS
DERIVED METRIC UNITS are the products of the BASIC units and
are:
AREA
VOLUME
CAPACITY
AREA is obtained by multiplying the basic units of LENGHT and
BREADTH (WIDTH) and is measured in SQUARE METRES
1. General – Units of measurement
VOLUME and CAPACITY are measured in CUBED LINEAR UNITS
as CUBIC METRES
The volume & capacity of liquids can be measured in LITRES.
VOLUME is the “ space occupied by an object or substance “
CAPACITY is the “ ability of a container or tank to hold
something”.
1. General – Units of measurement
3. COMPOUND METRIC UNITS
COMPOUND UNITS are made up of BASIC and DERIVED UNITS
OF MEASUREMENT such as :
STRESS
POWER
ENERGY
ACCELERATION
WORK
1.1 Basic metric units- exercises
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The
The
The
The
bar is three metres ( GB ) / meters ( US ) long.
bar is three meters in length.
bar has a length of three meters.
length of the bar is three meters.
The
The
The
The
driving belt is sixty millimeters broad / wide.
driving belt is sixty millimeters in breadth / width.
driving belt has a breadth / width of sixty millimeters.
breadth / width of the driving belt is sixty millimeters.
The support tower is one / a hundred meters high.
The support tower is one hundred meters in height.
The support tower has a height of one hundred meters.
The height of the support tower is one hundred meters.
1.1 Basic metric units- exercises
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The sheet is three millimeters thick.
The sheet has a thickness of three millimeters.
The thickness of the sheet is three millimeters.
The
The
The
The
trench is two meters deep.
trench is two meters in depth.
trench has a depth of two meters.
depth of the trench is two meters.
The block has a mass of 50 kilogrammes ( GB ) / kilograms ( US ).
The block is of 50 kg. mass.
The mass of the block is fifty kilogrammes.
1.2 Derived metric units - exercises
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The plate has an area of six square meters.
The plate is six square meters in area.
The area of the plate is six square meters.
The brick has a volume of one thousand six hundred cubic
centimeters.
The brick is one thousand six hundred cubic centimeters in volume.
The volume of the brick is one thousand six hundred cubic
centimeters.
The tank has a capacity of twenty - four cubic meters.
The tank is twenty - four cubic meters in capacity.
The capacity of the tank is twenty - four cubic meters.
2. Shapes
2. Shapes - exercise
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It is shaped like a circle. – It’s circular in shape.
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It is shaped like a cylinder. – ...
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It is shaped like a sphere. – ...
3. Tonnage
= a measure of the size or cargo carrying capacity of
a ship = the amount of cargo the vessel is capable
of carrying
Gross Register Tonnage
Net Tonnage
Deadweight Tonnage
3.1 Gross Register Tonnage
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the entire volume of the enclosed spaces of the
vessel that can be used for cargo, stores and
accommodation
3.2 Net tonnage
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volume that can be used to carry cargo
it is calculated by deducing the spaces that are not
used for cargo from the gross tonnage
often used to calculate harbour dues
3.3 Deadweight tonnage
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the weight of all the contents a vessel is capable of
carrying when loaded to summer mark
4. Cargo spaces
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Bale space
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Grain space
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Oil space
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Ullage
4.1 Bale space
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the volume of the cargo holds that can be used to
carry general cargo
4.2 Grain space
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the volume of the cargo holds that can be used to
carry dry bulk cargo
4.3 Oil space
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98 % of the total volume of wet bulk tanks
4.4 Ullage
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empty space on top of the liquid level that will
prevent a tank from overflowing when oil expands
due to heat
5. Displacement
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the amount of water that the ship displaces while
floating
the weight of the displaced fluid is directly
proportional to the volume of the displaced fluid (if
the surrounding fluid is of uniform density).
5. Displacement
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Archimedes’ principls (Archimede’s principle) states
that the buoyant force on an object is going to be
equal to the weight of the fluid displaced by the
object, or the density of the fluid multiplied by the
submerged volume times the gravitational constant,
e.g. among completely submerged objects with
equal masses, objects with greater volume have
greater buoyancy.
6. Dimensions
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Length Over All (L.O.A.)
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Length between Perpendiculars
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Breadth / Width
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Moulded breadth
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Moulded depth
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Beam
6. Dimensions
6. Dimensions
6.1 Length Over All (L.O.A.)
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the length from the extreme point of
stern to the extreme point of stem (bow)
6.2 Breadth / Width
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the breadth (width) measured to the outside
surface of plating
6.3 Moulded breadth
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the horizontal distance between the insides of the
moulds
breadth at the widest point measured to the outside
surface of the frames
6.4 Moulded depth
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vertical distance between the insides of the moulds
(including the double bottom)
the vertical distance amidships from the top of keel
to the top of deck beam at the underside of the
deck plating at ship's side
6.5 Beam
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the extreme breadth of the vessel
important for obtaining clearance to proceed in
restricted, narrow fairways
6.6 Length Between Perpendiculars
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is measured between the fore perpendicular and
aft-perpendicular
6.7 Construction waterline
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line to which the ship may be loaded in summer
6.8 Draught (draft)
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the vertical distance from the surface of the
water (waterline) to the vessel's bottom
loaded draft, light draft, salt-water draft, freshwater draft
6.9 Freeboard
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the vertical distance from the water to the
weather deck edge at any point in the lenght
of the ship
distance between the deckline and waterline
6.10 Height or Air draught
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distance from the waterline to the highest point of
the vessel
vertical clearance
6.11 Underkeel Clearance
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the distance between keel and seabed