286-Vessel Stability / 748
Vessel Stabilit
y
BOS-PRD-07.900601
Good drainage of decks
shall
be maintained at all times because water on deck reduces the stability of the
vessel.
Unless otherwise specified, if the vessel is listing so that there is a danger of getting water on deck the
Maste
r
shall
make every effort to determine the cause of the list and take immediate action to reduce heel.
When pipe deck cargoes (or other cargoes liable to provide a temporary trap for water) are carried, adequate
areas
shall
be provided between adjacent stowage racks and between the vessels structure and stowage
racks to ensure free drainage of the pipe stowage positions: such areas
shall
be in excess of the freeing port
area provided.
4.
2 C
a
r
g
o
l
o
a
d
i
n
g
a
n
d d
is
c
h
a
r
g
e
When loading cargo, the
Maste
r
shall
ensure that the draft at load line mark does not exceed the Plimsol
mark.
Should the value of the Plimsol draft fall above the maximum allowed, corrective action
shall
be taken to
unburden the vessel as necessary.
Should the value of the vertical height of the centre of gravity (VCG) fall above the maximum allowed,
corrective action
shall
be taken as follows:
x
Check condition of the liquid tanks; they
should
either be full and pressed up or completely dry;
x
Head into sea;
x
Seek shelter and alert crew as good judgment dictates.
When loading cargo attention
shall
be paid to the need for maintaining freeboard at the stern with regard to
the safety of the crew working on deck and to the adverse effect trim by the stern has on the stability of the
vessel.
In addition, it
shall
be ensured that the stern trim limitation is maintained according the value given by the
instructions in the
Stability Book
.
Care
shall
be taken to ensure that the cargo allocated to the ship is capable of being stowed, so that
compliance with the criteria can be achieved.
Before a voyage commences, care
shall
be taken to ensure that the cargo and sizeable pieces of equipment
have been properly stowed or lashed; to minimise the possibility of both longitudinal and lateral shifting while
at sea under the effect of acceleration caused by rolling and pitching.
Cargo
should
be arranged, as far as possible, to be unloaded from the top, i.e. deck cargo
should
be
discharged (heaviest items first) before any under deck cargo.
4.
2
.1
L
iq
u
i
d
c
a
r
g
o
Always prefer loading tanks located at the bottom, but considering departure and arrival conditions.
Try to keep tanks distribution consistent between departure and arrival conditions at sea; E.g: minimise fluid
transfer except for consumables and fuel oil.
Always consider tanks structural limitations and restrictions on loading/unloading systems.
4.
2
.
2 B
allast ta
n
ks
Ballast tanks in any condition which are to be full
shall
be pressed full.
Tanks which are dry
should
be completely dry: left over levels/quantities
shall
be carefully estimated and
entered in the stability calculations.
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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