The stowage and cargo securing arrangements for timber deck cargoes should enable a safe yet rational securing of the cargo so that it is satisfactorily prevented from shifting by collapsing, sliding or tipping in any direction, taking into account the acceleration forces the cargo may be subjected to throughout the voyage in the worst sea and weather conditions which may be expected.
- Prior to loading the vessel, relevant cargo information, as defined in chapter of timber Code, should be provided by the shipper, according to the custom of the trade.
The following information as applicable for each parcel of cargo should be provided by the shipper and collected by the master or his representative:
- total amount of cargo intended as deck cargo;
- typical dimensions of the cargo;
- number of bundles;
- density of the cargo;
- stowage factor of the cargo;
- racking strength for packaged cargo;
- type of cover of packages and whether non-slip type; and
- relevant coefficients of friction including covers of sawn wooden packages if applicable.
- The master of the vessel should study the relevant cargo information and take the precautions necessary for proper stowage, securing and safe carriage of the cargo as defined in this Code and as prescribed in the vessel’s Cargo Securing Manual.
A pre-loading plan according to the ship’s Trim and Stability Book should be done and the following should be calculated and checked:
- stowage height;
- weight per m2;
- required amount of water ballast; and
- displacement, draught, trim and stability at departure and arrival.
When undertaking stability calculations, variation in displacement, centre of gravity and free surface moments due to the following factors should be considered:
- absorption of water in timber carried as timber deck cargo according to special instruction.
- ice accretion, if applicable;
- variations in consumables; and
- ballast water exchange operations, in accordance with approved procedures.
- Prior to loading, the stevedoring company should be made aware of specific requirements according to the ship’s Cargo Securing Manual regarding stowage and securing of timber deck cargoes.
During loading of deck cargo the master should ensure that all tanks are maintained in such a condition that free surface effects are minimized. Ballast tanks should as far as practicable be either full or empty and ballast movement during loading operations should be avoided.
Before timber deck cargo is loaded on any area of the weather deck:
- hatch covers and other openings to spaces below that area should be securely closed and battened down;
- air pipes and ventilators should be effectively protected and check-valves or similar devices should be examined to ascertain their effectiveness against the entry of water;
- objects which might obstruct cargo stowage on deck should be removed and safely secured in places appropriate for storage;
- the condition of friction-enhancing arrangements, where fitted, should be checked;
- accumulations of ice and snow on such area should be removed;
- it is normally preferable to have all deck lashings, uprights, etc., readily available before loading on that specific area. This will be necessary should a preloading examination of securing equipment be required in the loading port; and
- all sounding pipes on the deck should be reviewed and arrangements made that access to these remain as far as practicable