C.1 Mass increase due to water absorption for
a timber deck cargo in protective packaging or covered by a protective
awning or timber that has been immersed in water until loaded on board
should not be taken into account in the ship's stability calculation
for arrival at the port of destination.
C.2 Calculation of mass change P of a timber deck
cargo should be done by the formula:
where
T pl – planned duration of the voyage, days;
δP day,% – wood mass change per day, to be chosen from table C.1
C.3 Corresponding line in table C.1 should be
chosen by means of comparison of the forthcoming voyage with the timber
cargo transportation lines specified in the leftmost column "Line".
C.4 With calculation value being δP
≤ 2%, water absorption of a timber deck cargo should not
be taken into account in the ship's stability calculations as it is
commensurable with initial calculation data determination errors.
C.5 With calculation value being δP
≥ 10%, water absorption of a timber deck cargo δP
= 10% should be taken into account.
Table C.1 Daily wood mass
change
Line
|
Deck cargo mass change per day, δPday, %
|
Sawn
wood
|
Round wood cargo
|
Vladivostok – ports of Japan
|
1.00
|
0.14
|
Ports of Malaysia – ports of
Japan
|
0.73
|
0.10
|
Ports of Canada, USA –
ports of Japan
|
1.00
|
0.14
|
Saint-Petersburg – London
|
0.83
|
0.11
|
Arkhangelsk – Manchester
|
1.16
|
0.15
|
Australasia – North Asia
|
-
|
-0.10
|