289-Vessel Stability / 748
Vessel Stabilit
y
BOS-PRD-07.900601
4
.
3
.
2
S
p
e
c
i
f
i
c c
omp
a
ny
i
n
st
ruc
ti
o
n
s i
n
c
ase
of
d
a
m
a
g
e
In case of flooding, proper investigation
should
take place before any action:
x
Any progressive flooding of undamaged spaces
shall
be prevented;
x
Extend of damage
shall
be established as soon as possible (it may not correspond to any damage
case analysed into
Stability Booklet
);
x
Vessel stability
should
be assessed based on the actual extent of damage and spaces flooded;
x
In case of any corrective action (ballasting) to improve the vessel stability condition it
should
be
verified that the minimum required stability
shall
be maintained at any stage of the correction.
Special care to cross section valve opening
should
be considered.
The residual calculated heel in damage condition
shall
be limited, and water on deck best prevented.
For the preparation of specific operations such as lifting operations, towing or anchor handling operations,
the standard damage conditions requirements can be disregarded. It is supposed that such a specific
operation would be immediately stopped in case of damage to the vessel.
4
.
4 En
te
r
i
n
g
dry d
o
ck
Before docking the vessel, the
Maste
r
shall
check:
x
The weight of the vessel: it is recommended that the vessel be kept as light as possible;
x
The trim of the vessel: for correct keel docking, set the trim even keel or slightly down by the head;
x
The hull fatigue: by keeping bending moments and shearing forces to acceptable levels to prevent
damage to bottom of the vessel.
Specific attention
should
be given to the tanks that are filled in relation to preparation of the number of keel
blocks supporting the below structure.
The
Maste
r
shall
check that the vessel is in an acceptable stability condition prior to entering the dry dock.
The lightest condition
shall
be observed.
Before entering a port with threshold (minimum available water) the
Maste
r
shall
check that vessel draft is
not exceeding threshold draft. Trim and speed (squat effect may be observed)
shall
be considered with
particular care.
4
.
5 R
o
ll stabilisati
o
n
s
y
ste
m
s
The
Maste
r
shall
refer to the vessel specific instructions and limitations as described in the
Stability Booklet
.
In all loading conditions where the stabilising systems are included, the system
shall
be tuned to their
working level, according to designer specifications based on vessel rolling period.
For stabilisation tanks, the full free surface loss
shall
be taken into account when assessing the vessels
stability.
Roll stabilisation systems reduce the stability of the vessel and they
shall
be inactive for all stability critical
operations.
Stabilisation tanks
shall
be kept empty or full in such situations.
4
.
6
I
c
i
n
g
If the vessel is engaged in waters where the possibility of top-side icing may occur the
Maste
r
shall
take
action as deemed necessary, either to remove the ice or at least to keep it to a minimum; bearing in mind
that the topside icing
shall
adversely affect the stability of the vessel.
Version 04. Original date: 22/06/2012. Version date: 31/12/2014. Valid version only on QMS site. Uncontrolled document when printed.
Procedure prepared by: BOS Operations Department Project Coordinator. Approved by: BOS Head of Operations. Validated by: BOS Quality Representative.
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