Function III : Controlling the operation of ship & care for persons on board
at operational level
Competence No. 13: Maintain sea worthiness of the ship
Detailed Teaching Syllabus
Ship construction and stability
Lectures
Teaching
Method (Hours)
Teaching
Material
L (3.0)
Ex. (2.0)
T-24, T-25,
T-26
A) SHIP CONSTRUCTION (Incl. Corrosion &
Maintenance of Hull and Fittings)
1. Ship dimensions and form
1. Illustrates the general arrangement of the following ship types
- general cargo
- oil, chemical & gas tankers
- bulk carriers
- combination carriers
- container
- ro-ro
- passenger
2. Draws an elevation of a general cargo ship showing holds, engine room peak
tanks, double-bottom hatchways and position of bulkheads
3. Draws an elevation of a typical crude oil carrier, showing bulkheads, cofferdams,
pump-room, engine-room, bunker and peak tanks, cargo tanks permanent ballast
tanks.
4. Draws a plan view of a tanker, showing the arrangement of cargo & ballast tanks
5. Defines and illustrates
- camber
- rise of floor
- tumblehome
- flare
- sheer
- rake
- parallel middle body
- entrance
- run
6. Defines
- forward perpendicular (FP)
- after perpendicular (AP)
- length between perpendiculars (LBP)
- length on the waterline (WL)
- length overall (LOA)
- base line
- moulded depth, beam and draught
- extreme depth, beam and draught
-
2. Ship stresses
Page:1of 12
1. Describes in qualitative terms shear force and bending moments
2. Explains what is meant by ‘hogging’ and by ‘sagging’ and distinguishes between
them
3. Describes the loading conditions which give rise to hogging and sagging stresses
4. Describes how hogging and sagging stresses are casused by the sea state
5. Explains how hogging and sagging stresses result in tensile or compressive forces
in the deck and bottom structure
6. Describes water pressure loads on the ship’s hull
7. Describes liquid pressure loading on the tank structures
8. Calculates the pressure at any depth below the liquid surface, given the density of
the liquid
9. Describes qualitatively the stresses set up by liquid slashing in a partly filled tank
10. Describes racking stress and its causes
11. Explains what is meant by ‘pounding’ or slamming’ and states which part of the
ship is affected
12. Explains what is meant by ‘panting’ and states which parts of the ship are
affected
13. Describes stresses caused by localized loading
14. demonstrates understanding of modern methods of determining the effects of
different loading and ballasting on the ship’s structure
15. demonstrates ability to use one of the modern mechanical or electrical aids to
determining stress
16. understands the input and output data from stress calculation machines and has a
working knowledge of the stress tables
17. states the purpose of a shipboard stress finding system, including details of input
data and the output obtained
18. describes how output data from ship stress finding system may be used
19. appreciates torsion stress particularly with reference to container ship loading
20. analyses the stress areas created by bending moments and shearing forces
derived by a stress indicator
21. analyses the causes and effects of shearing forces and bending moments on
ship’s structures
22. defines bending moment as difference between moment of buoyancy and
moment of weight
23. defines shearing forces in terms of the difference between buoyancy and weight
24. extracts information from shear force and bending moment diagrams
25. describes the constructional features which compensate for stress
L (3.0)
Page:2of 12
T-24, T-25,
T-26
3. Hull structure
1. Identifies structural components on ship’s plans and drawings
- frames, floors, transverse frames, deck beams, knees, brackets
- shell plating, decks, tank top, stringers
- bulkheads and stiffeners, pillars
- hatch girders and beams, coamings bulwarks
- bow and stern framing, cant beams, breasthooks
2. Describes and illustrates standard steel sections
- flat plate
- offset bulb plate
- equal angle
- unequal angle
- channel
- tee
3. Identifies longitudinal, transverse and combined systems of framing on transverse
sections of ships
4. Sketches the arrangement of frames, webs and transverse, members for each
system
5. Illustrates double-bottom structure for longitudinal and transverse framing
L (4.0)
Ex. (2.0)
6. Illustrates hold drainage systems and related structure
7. Illustrates a duct keel
8. Sketches the deck edge, showing attachment of sheer strake and stringer plates
9. Sketches a radiused sheer and attached structure
10. Describes the stress concentration in the deck round hatch openings
11. Explains compensation for loss of strength at hatch openings
12. Sketches a transverse section through a hatch coaming showing the arrangement
of coamings and deep webs
13. Sketches a hatch corner in plan view, showing the structural arrangements
14. Sketches deck-freeing arrangements scuppers, freeing ports, open rails
15. Illustrates the connection of superstructures to the hull at the ship’s side
16. Sketches a connection of superstructures to deck, sides and double bottom and
the arrangement of stiffeners
17. Sketches a corrugated bulkhead
18. Explains why transverse bulkheads have vertical corrugations and fore and aft
bulkheads have horizontal ones
19. Describes the purpose of bilge keels and how they are attached to the ship’s side
Page:3of 12
T-24, T-25,
T-26
4. Bow and stern
1. Describes the provision of additional structural strength to withstand pounding
2. Describes and illustrates the structural arrangements forward to withstand panting
3. Describes the function of the sternframe
4. Describes and sketches a sternframe for a single screw ship
5. Describes and illustrates the construction of a transom stern, showing the
connections to the sternframe
L (2.0)
T-24,
T-25, T-26
L (6.0)
Ex. (2.0)
T-24, T-25,
T-26
5. Fittings
1. Describes and sketches an arrangement of modern weather-deck mechanical steel
hatches
2. Describes how watertightness is achieved at the coamings and cross joints
3. Describes the cleating arrangements for the hatches in 1.5.1
4. Describes the arrangement of portable beams, wooden hatch covers and tarpaulins
5. Sketches an oil tight hatch cover. Describes openings in Oil, Chemical & Gas
Tankers
6. Describes roller, multi-angle, pedestal and Panama fairleads
7. Sketches mooring bitts, showing their attachment to the deck
8. Sketches typical forecastle mooring and anchoring arrangements, showing the
leads of moorings
9. Describes the construction and attachment to the deck of tension winches and
explains how they are used
10. Describes the anchor handling arrangements from hawse pipe to spurling pipe
11. Describes the construction of chain lockers and how cables are secured in the
lockers
12. Explains how to secure anchors and make spurling pipes watertight in
preparation for a sea passage
13. Describes the construction and use of a cable stopper
14. Describes the construction of masts and sampson posts and how they are
supported at the base
15. Describes the construction of derricks and deck cranes
16. Describes the bilge piping system of a cargo ship
17. States that each section is fitted with a screw-down nonreturn suction valve
18. Describes and sketches a bilge strum box
19. Describes a ballast system
20. Describes the arrangement of a fire main and states what pumps may be used to
pressurize it
21. Describes the provision of sounding pipes and sketches a sounding pipe
arrangement
22. Describes the fitting of air pipes to ballast tanks or fuel oil tanks
23. Describes the arrangment of fittings and lashings for the carriage of containers
on deck
6. Rudders and propellers
1. Describes the action of the rudder in steering a ship
2. Produces drawings of modern rudders :semibalanced, balanced and spade
3. Explains the purpose of the rudder carrier and pintles
4. Explains how the weight of the rudder is supported by the rudder carrier
5. Describes the rudder trunk
6. Describes the arrangement of a watertight gland round the rudder stock
Page:4of 12
7. Explains the principle of screw propulsion
8. Describes a propeller and defines, with respect to it :
- boss
- rake
- skew
- face
- back
- tip
- radius
- pitch
9. Compares fixed -pitch with controllable-pitch propellers
10. Sketches the arrangement of an oil-lubricated sterntuble and tailshft
11. States how the propeller is attached to the tailshaft
12. Sketches a cross-section of a shaft tunnel
13. Explains why the shaft tunnel must be of watertight construction and how water
is prevented from entering the engine room if the tunnel becomes flooded
L (3.0)
Ex(1.0)
T-24, T-25,
T-26
L (2.0)
Ex.(1.0)
T-21,
T-22
L (2.0)
Ex.(1.5)
T-21, T-22
7. Load lines and draught marks
1.
2.
3.
4.
5.
6.
7.
8.
Explains where the deck line is marked
Defines ;freeboard’
Explains what is meant by ‘assigned summer freeboard’
Draws to scale the load line mark and the load lines a for a ship of a given
summer moulded draught, displacement and tonnes per centimetre immersion in
salt water
Explains how the chart of zones and seasonal areas is used to find the applicable
load line
Demonstrates how to read draughts
Explains that the freeboard, measured from the upper edge of the deck line to
the water on each side, is used to check that the ship is wihtin is permitted limits
of loading
explains plimsoll line
1. Displacement
.1 states that, for a ship to float, it must displace a mass of water equal to its own
mass
.2 explains how, when the mass of a ship changes, the mass of water displaced
changes by an equal amount
.3 defines the displacement of a vessel as its mass measured in tonnes
.4 states that displacement is represented by the symbol 
.5 explains that graph or scale can be drawn to show the relationship between the
displacement and mean draught of a ship
.6 given a displacement/draught curve, finds:
- displacements for given mean draughts
- mean draughts for given displacements
- the change in mean draught when given masses are loaded or discharged
- the mass of cargo to be loaded or discharged to produce a required change of
draught
.7 defines ‘light displacement’ and ‘load displacement’
.8 defines ‘dead weight’ and ‘displacement tonnages’
.9 uses a dead weight scale to find the dead weight and displacement of a ship at
Page:5of 12
various draughts in seawater
.10 uses a deadweight scale to determine the change in mean draught resulting from
loading or discharging a given tonnage
.11 given the present draughts and the density of dock water, calculates the draughts
in sea water
.12 uses a ship’s hydrostatic particulars and given mean draughts to determine the
approximate weight loaded or discharged
.13 sketches a ship’s load line indicating marks for various seasonal zones, areas and
periods
.14 defines ‘tonnes per centimetre immersion’ (TPC) & MCTC
.15 explains why TPC varies with different draughts
.16 uses a dead weight scale to obtain TPC at given draughts
.17 uses TPC obtained from a dead weight to find :
- the change of mean draught when given masses are loaded or discharged
- the mass of cargo to be loaded or discharged to produce a required change of
draught
.18 defines ‘block coefficient’ (Cb) & Water Plane Coefficient (W P)
.19 calculates Cb from given displacement and dimensions
.20 calculates displacement from given Cb and dimensions
2. Buoyancy
1 Explains what is meant by ‘buoyancy’
2 Defines the force of buoyancy as an upward force on a floating object created by
the pressure of liquid on the object
3. States that the buoyancy force is equal to the displacement of a floating object
4. Explains what is meant by ‘reserve buoyancy’
5. Explains the importance of reserve buoyancy
6. Explains how freeboard is related to reserve buoyancy
7. Explains the purpose of load lines
L (1.0)
T-21, T-22
L (1.0)
Ex(1.0)
T-20, T-21,
T-22
3. Fresh water allowance
1. Explains why the draught of a ship decreases when it passes from fresh water to
seawater and vice versa
2. States that when loading in fresh water before proceeding into seawater, a ship is
allowed a deeper maximum draught
3. States that the additional draught is called the fresh water allowance (FWA)
4. Given the FWA and TPC for fresh water, calculates the amount which can be
loaded after reaching the summer load line when loading in fresh water before
sailing into seawater
5. Uses a hydrometer to find the density of dock water & defines the Dock Water
Allowance (DWA)
6. Given the density of dock water and TPC for seawater, calculates the TPC for
dock water
7. Given the density of dock water and FWA, calculates the amount by which the
appropriate load line may be submerged
8. Given the present draught amidships and the density of dock water, calculates the
amount to load to bring the ship to the appropriate load line in seawater
4. Statical stability
Page:6of 12
1. States that weight is the force of gravity on a mass and always acts vertically
downwards
2. States that the total weight of a ship and all its contents can be considered to act at
a point called the centre of gravity (G)
3. Defines the centre of buoyancy (B) as being the centre of the underwater volume
of the ship
4. States that the total force of buoyancy always acts vertically upwards
5. Explains that the shape of buoyancy can be considered as a signle force acting
through B
L (2.0)
Ex. (2.0)
6. Explains that when the shape of the underwater volume of a ship changes the
position of B also changes
7. States that the position of B will change when the draught changes and when
heeling occurs
8. Labels a diagram of a midship cross-section of an upright ship to show the weight
acting through G and the buoyancy force acting through B
9. States that the buoyancy force is equal to the weight of the ship
10. Labels a diagram of a midship cross-section of a ship heeled to a small angle to
show the weight acting through G and the buoyancy force acting through B
11. Describes stability as the ability of the ship to return to an upright position after
being heeled by an external force
12. Defines the righting lever GZ as the horizontal distance between the vertical
forces acting through B and G
13. States that the forces of weight and buoyancy form a couple
14. States that the magnitude of the couple is displacement x lever, A x GZ
15. Explains how variations in displacement and GZ affect the stability of the ship
16. On a diagram of a heeled ship, shows:
- the forces at B and G
- the lever GZ
17. States that the length GZ will be different at different angles of heel
18. States that if the couple A x GZ tends to turn the ship towards the upright, the
ship is stable
19. States that for a stable ship
- A x GZ is called the righting moment
- GZ is called the righting lever
T-20, T-21, T-22
T-20, T-21, T-22
5. Initial stability
1. States that it is common practice to describe the stability of a ship by its reaction
to heeling to small angles (up to approximately 10 0)
2. Defines the transverse metacentre (M) as the point of intersection of successive
buoyancy force vectors as the angle of heel increases by a small angle
3. States that for small angles of heel, M can considered as a fixed point on the
centre line
4. On a diagram of a ship heeled to a small angle, indicates G,B,Z and M
5. Shows on a given diagram of a stable ship that ‘M’ must be above G and states
that the metacentric height GM is taken as positive
6. Shows that for small angles of heel (), GZ = GM x sin ()
L (3.0)
Ex.(2.0)
Initial stability (Contd.)
7. States the value of GM is a useful guide to the stability of a ship
8. Describes the effect on a ship’s behaviour of
Page:7of 12
T-20, T-21, T-22
- a large GM (stiff ship)
- a small GM (tender ship)
9. Uses hydrostatic curves to find the height of the metacentre above the keel (KM)
at given draughts
10. States that KM is only dependent on the draught of a given ship
11. Given the values of KG. Uses the values of KM obtained from hydrostatic curves
to find the metacentric heights, GM
12. States that, for a cargo ship, the recommended initial GM should not normally be
less than 0.15 m
6. Angle of loll
1. Shows that if G is raised above M, the couple formed by the weight and buoyancy
force will turn the ship further from the upright
2. States that in this condition, GM is said to be negative and  x GZ is called the
upsetting moment or capsizing moment
3. Explains how B may move sufficiently to reduce the capsizing moment to zero at
some angle of heel
4. States that the angle at which the ship becomes stable again is known as the angle
of loll
5. States that the ship will roll about the angle of loll instead of the upright
6. States that an unstable ship may loll to either side
7. Explains why the condition described in 6.3 above. Is potentially dangerous
8. Corrects angle of loll
T-20, T-21, T-22
L (1.0)
Ex .(1.0)
7. Curves of statical stability
1. States that for any one draught the lengths of GZ at various angles of heel can be
drawn as a graph.
2. States that the graph described in 7.1 is called a Curve of Statical Stability
3. States that different curves are obtained for different draughts with the same initial
GM
4. Identifies cross curves (KN curves & MS curves)
5. derives the formula GZ = MS + GM sine 
6 Derives the formula GZ=KN-KG sine 
7 Derives GZ curves for stable and initially unstable ships from KN curves
8 From a given curve of statical stability, obtains
- the maximum righting lever and the angle at which it occurs
- the angle of vanishing stability
- the range of stability
9. Shows how lowering the position of G increases all values of the righting level
and vice versa
10. States that angles of heel beyond approximately 40 0 are not normally of practical
interest because of the probability of water entering the ship at larger angles
L (2.0)
Ex.(2.0)
7. Curves of statical stability (Cont.)
11. calculates by using moments about the keel, the position of G for a given
disposition of cargo, fuel and water
12. uses hydrostatic data to find the KM and thence the GM
13. states that, for a cargo ship, the recommended initial GM should not normally be
less than 0.15m
14. uses KN curves to construct a curve of statical stability and from it reads the
maximum righting lever and angle at which it occurs
15. calculates the arrival of GM from the departure conditions and the consumption
of fuel and water, including the loss of GM due to FSE
Page:8of 12
T-20, T-21,T -22
16. plans the use of fuel and water to keep free surface effects to a minimum
17. estimates the loss of GM resulting from absorption of water by deck cargo
8. Movement of the Centre of Gravity
1. States that the centre of gravity (G) of a ship can move only when masses are
moved within, added to, or removed froma the ship
2. States that
- G moves directly towards to wards the centre of gravity of added masses
- G moves directly away from the centre of gravity of removed masses
- G moves parallel to the path of movement of masses already on board
3. calculates the movement of G (GG1) from
- GG1 = mass added or removed x distance of mass from G
new displacement of ship
- GG1 = mass moved x distance mass is moved
displacement of ship
4. performs calculations as in 2.8.3 to find the vertical and horizontal shifts of the
centre of gravity resulting form adding, removing or moving masses
5. states that if a load is lifted by using a ship’s derrick or crance, the weights is
immediately transferred to the point of suspension
6. states that if the point of suspension is moved horizontally, the centre of gravity
of the ship also moves horizontally
7. states that if the point of suspension is raised or lowered, the centre of gravity of
the ship is raised or lowered
8. calculates, by using moments about the keel, the position of G after loading or
discharging given masses at stated positions
9. calculates the change in KG during a passage resulting from
- consumption of fuel and stores
- absorption of water by a deck cargo
- accretion of ice on deck and superstructures given the masses and their position
9. Lists and its corrections
1.
2.
shows on a diagram the forces which cause a ship to list when G is to one side
of the centre line
states that the listing moment is given by displacement x transverse distance of
G from the centre line
L (1.0)
Ex. (2.0)
T-20, T-21, T-22
L (1.0)
Ex.(1.0)
T-20,T-21, T-22
9. Lists and its corrections (cont.)
shows on a diagram that the angle of list () is given by tan  = GG1 , where
GM
GG1 is the transverse shift of G from the centre line
4. states that in a listed condition the range of stability is reduced
5. given the displacement, KM and KG of a ship, calculates the angel of list
resulting form ,loading or discharging a given mass at a stated position, or from
moving a mass through a given transverse distance
6. explains with reference to moments about the centre line how the list may be
removed
7. given the displacement, GM and angle of list of a ship, calculates the mass to
move through a given transverse distance to bring the ship upright
8. given the displacement, GM and angle of list of a ship, calculates the mass to
move through a given transverse distance to bring the ship upright.
9. given the draught, beam and rise of the floor, calculates the increase in draught
resulting from a stated angle of list
3.
Page:9of 12
10. Effect of slack tanks
1.
2.
3.
4.
5.
states that if a tank is full of liquid its effect on the position of the ship’s centre
of gravity is the same as if the liquid were a solid of the same mass
show by means of diagrams how the centre of gravity of the liquid in a partly
filled tank moves during rolling
states that when the surface of a liquid is free to move, there is a virtual increase
in KG, resulting in a corresponding decrease in GM
states that the increase in KG is affected mainly by the breadth of the free
surface and is not dependent upon the mass of liquid in the tank
states that tanks are often constructed with a longitudinal subdivision to reduce
the breadth of free surface
L (1.0)
Ex.(1.0)
T-20, T-21, T-22
L (3.0)
Ex (4.5)
T-20, T21, T-22
11. Trim
1.
2.
3.
4.
5.
6.
defines ‘trim’ as the difference between the draught forward and draught aft
states that trim may be changed by moving masses already on board forward or
aft, or by adding or removing masses at a position forward of or abaft the centre
of flotation
define ‘centre of flotation’ as the point about which the ship trims, and states
that in is sometimes called the tipping centre.
states that the centre of flotation, is situated at the center of area of the water
plane which may be forward of crabaft amidships
uses hydrostatic data to find the position of the centre of flotation for various
draughts
defines a trimming moment as mass added or removed x its distance forward or
aft of the centre of flotation or for masses already on board, as mass moved x the
distance moved forward or aft
Trim (Contd.)
7.
defines the moment to change trim by 1 cm (MCT Icm) as the moment about
the centre of flotation necessary to change the trim of ship by 1 cm
8. uses hydrostatic curves or deadweight scale to find the MCT Icm for various
draughts
9. given the value of MCT Icm, masses moved and the distances moved forward or
aft calculates the change in trim
10. given the value of MCT Icm, the position of the centre of floatation, masses
added or removed and their distances forward of or abaft the centre of floatation
calculates
11. Given initial draughts and the position of the centre of floatation, extends the
calculation in 2.11.9 to find the new draughts
12. Given initial draughts and TPC, extends the calculation in 2.11.10 to find the
new draughts
13. Uses a trimming table or trimming curves to determine changes in draughts
resulting fron loading discharging or moving weights
14. States that in case where the change of mean draught is large calculation of
changes of trim moments about the centre of floatation or by means of trimming
tables the centre of flotation or by means of trimming tables should not be used.
15. Calculates final draughts and trim for a planned loading by considering changes
to a similar previous loading
16. given the draught amidships and dock-water density, calculates the amount to
Page:10of 12
load to bring the ship to the appropriate load line in sea water
17. uses hydrostatic data to find the position of the centre of floatation, MCT and
TPC for a given draught
18. calculates the change of trim resulting from loading or discharging a given
weight at a specified position
19. given the initial draughts, forward and aft, calculates the new draughts after
loading or discharging a given quantity of cargo
20. uses a trimming table or curves to determine changes in draught resulting from
loading, discharging or moving weights
21. calculates final draughts and trim for a planned loading by considering changes
to a similar previous loading
Page:11of 12
12. Actions to be taken in the event of partial loss of intact
buoyancy
1. States that flooding should be contained by prompt closing of watertight doors,
valves and any other compartments
L(1.0)
T-22
L (1.0)
T-22
2. States that cross-flooding arrangements, where they exist, should be put into
operation immediately to limit the resulting list
3. States that any action which could stop or reduce the inflow of water should be
taken
13. Demonstrates the use of Stress Tables & Stress Calculating
Ex.(0.5)
Equipment - Lodicator
14. Explains the Intact Stability Criteria as per IMO Code of
Intact Stability
L (1.0)
R-33
15. Explains the use of Stability Booklet & Calculations based on
L (1.0)
T-20
Ex.(1.0)
it
TOTAL
72.5 Hrs
Prepared by:
Approved by:
Course Coordinator
Project Head
Page:12of 12