Artikel 20

1. All necessary measures shall be taken to ensure the safety of workers required to be in the hold or on a cargo deck of a ship when power vehicles operate in that hold or loading or unloading operations are taking place with the aid of power-operated appliances.
2. Hatch covers and beams shall not be removed or replaced while work is in progress in the hold under the hatchway. Before loading or unloading takes place, any hatch cover or beam that is not adequately secured against displacement shall be removed.
3. Adequate ventilation shall be provided in the hold or on a cargo deck by the circulation of fresh air to prevent risks of injury to health arising from the fumes emitted by internal combustion engines or from other sources.
4. Adequate arrangements, including safe means of escape, shall be made for the safety of persons when dry bulk cargo is being loaded or unloaded in any hold or 'tween deck or when a worker is required to work in a bin or hopper on board ship.