- IMO issues recommendations for stowage of dangerous goods which may be either “on deck”, “under deck” or “optional”. For some commodities stowage under deck is considered the safest, but other commodities may be stowed on deck only owing to their properties.
- Commodities may require on deck stowage when:
- Constant supervision is required; or
- accessibility is particularly required; or
- there is a substantial risk of formation of explosive gas mixtures, development of highly toxic vapours, or unobserved corrosion to ship
- Regulations pertaining to stowage and segregation of dangerous goods are stipulated in the IMDG-Code.
- In order to protect dangerous goods from adverse weather and also from the impact of collision, containers with dangerous goods must not be stowed in outboard stacks except fumigated units (UN3359), which may be stowed in outboard stacks”.
In order to protect containers with dangerous goods for being torn apart when resting on two hatch covers following restriction is valid on all container vessels: “ Containers with dangerous goods and in bottom tier must not be stowed resting on two hatch covers.
Dangerous goods stowed in open containers e.g. open top, open side-open top, flatracks and ATD’s are only acceptable on deck if stowed in front of the accommodation/funnel and if practically possible overstowed/protected by other containers. Open containers with dangerous goods are not allowed on deck aft of the accommodation/funnel.