Loadline reg
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Transcript of Loadline reg
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8/10/2019 Loadline reg
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Freeboard
Assignment
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Assignment FreeboardThe FreeboardAssignedis the
distance measured
vertically downwardsat amidships from the
upper edge of the deck
line to the upper edgeof the related load line
when floating in SW.
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Purpose of Freeboard
regulations
Ensure adequate reserve buoyancy
Ensure adequate stability
Avoid excessive stress on the ships
hull due to overloading
Protection of crewaccess, railings
etc..
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Freeboard Deck
Normally it is the uppermostcontinuous deck exposed to weather
and sea
Has permanent means of closing allopenings in the weather part thereof
Below which all openings in the sides
of the ship are fitted with permanent
means of watertight closing
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Deck line A horizontal line marked amidships on
each side of the ship.
The upper edge of which corresponds
with the upper surface of the freeboard
deck.
It may be displaced e.g. due to a roundedshearstrake (tankers, bulkers)
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Method of Assignment
Carried out by a Surveyor
Identifies the basic ship type, A or B
Assigns a Tabulated Freeboard Assesses Type B ships for further
reduction, B-60 or B-100 & other
corrections to obtain Basic Freeboard Applies further corrections to obtain
Assigned Freeboard.
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TYPE A SHIP Characteristics
Vessels designed to only carry liquidcargoes in bulk
Small, watertight openings closed by steel covers
Freeboard deck has a high integrity with a low
permeability of loaded cargo spaces
There is a high degree of sub-division
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If the vessel is over 150m long and has emptycompartments when fully loaded at the Summer
Loadline she should be capable of remaining
afloat after the flooding of such compartments(assumed permeability of 95%) in a prescribed
Condition of Equilibrium.
If over 150m long then the machinery space isconsidered as a floodable compartment (assumed
permeability 85%)
TYPE A SHIP
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STATE OF EQUILIBRIUM
Final waterline MUST BE below any opening
that allows progressive flooding
Final angle of heel not to exceed 15 (17 if
deck edge not immersed).
Final GM at least 0.05m.
Residual Stability
Max. GZ not less than 0.1m. Positive range at least 20
Remaining Area under the curve at least
0.0175 mr.
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ASSUMED DAMAGE
Vertical
from keel to deck
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ASSUMED DAMAGE Transverse20% of the beam or 11.5m
(whichever the least)
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ASSUMED DAMAGE Longitudinallybetween transverse
bulkheads (B-100to include 1 bulkhead otherthan machinery space bulkhead)
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ASSUMED DAMAGE
Verticalfrom keel to deck
Transverse20% of the beam or
11.5m (whichever the least)
Longitudinallybetween transverse
bulkheads (B-100 to include onebulkhead other than machinery space
bulkhead)
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TYPE B SHIP
Any ship other than a Type-A ship
have greater vulnerability and therefore require
a larger freeboard
Type B ships have less sub-divisionMore vulnerable to flooding in heavy weather
Have large deck openings
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TYPE B-60 SHIP
Must be over 100m long
Steel weathertight hatch covers
Must remain afloat in the Condition of Equilibrium
after the flooding of a single compartmentIf the above conditions are met then the Tabulated
Freeboard may be reduced by 60% of the difference
between A & B
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TYPE B-100 SHIP
In addition to Type B-60
Steel watertight hatch covers
E.Rm access from the deck protected by a deck house
Open rails, not bulwarks, for 50% of the ships length
Crew access between Poop & detached bridge must be
by gangway or under deck passage
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TYPE B-100 SHIP
In addition to Type B-60
Must remain afloat in the condition of Equilibrium after
the flooding of a any 2 fore & aft adjacent compartments
compartment( = 95%). If the ship is over 150m long
then the machinery space alone can be regarded as a
floodable compartment ( = 85%).If the above conditions are met then the Tabulated
Freeboard may be reduced by 100% of the difference
between A & B
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ASSUMED DAMAGE
Verticalfrom keel to deck
Transverse20% of the beam or
11.5m (whichever the least)
Longitudinallybetween transverse
bulkheads (B-100 to include onebulkhead other than machinery space
bulkhead)