Annex C – Instruction to a Master on Calculation of Mass Change of a Timber Deck Cargo due to Water Absorption
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Statutory Documents - IMO Publications and Documents - International Codes - 2011 TDC Code – Code of Safe Practice for Ships Carrying Timber Deck Cargoes, 2011 – Resolution A.1048(27) - Annex C – Instruction to a Master on Calculation of Mass Change of a Timber Deck Cargo due to Water Absorption

Annex C – Instruction to a Master on Calculation of Mass Change of a Timber Deck Cargo due to Water Absorption

  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

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