Stowage and Segregation of IMDG Cargo

Stowage of IMDG cargo

• Stowage means proper placement of cargo onboard a ship in order to ensure safety and Environment protection. 
• Stowage on deck means stowing on weatherdeck.
• Stowage under deck means any stowage that is not in weatherdeck.
• Storage requirement assigned through stowage category in column "16A" of dangerous goods list.
• These categories define whether the storage categories shall be on Deck or under deck and in some cases stowage in a particular space or type of vessel may be prohibited.
• There are separate categories for (class 1 goods) and (class 2 to 9 goods).

IMDG Code stowage and Segregation rules for dangerous goods vessels are categorized into two types, Cargo Ships, and Passenger Ships.

For Class 1:  Explosives, Cargo ships (up to 12 passengers), and Passenger ships.

For Class 1 categories are 1 to 5

CTU means closed cargo transport unit.

For Class 2-9: Cargo ships or passenger ships carrying a number of passengers limited to not more than 25 or to 1 passenger per 3 m of overall length and Other passenger ships in which the limiting number of passengers is exceeded.

For Class 2-9 categories are A to E

Segregation of IMDG cargo:

Definition of the segregation terms:

Legend:

(A) Package containing incompatible goods.

                         

(B) Reference package.

                       

(C) Deck resistant to fire and liquid.

                    

Note:

Full vertical lines represent transverse bulkheads between compartments or holds resistant to fire and liquid.

1)“Away from”: Effectively segregated so that the incompatible materials cannot interact dangerously in the event of an accident but may be carried in the same compartment or hold or on deck provided a minimum horizontal separation of 3 m projected vertically is obtained.

2)“Separated From”: In different compartments or holds when stowed under deck. If the intervening deck is resistant to fire and liquid, a vertical separation (i.e., in different compartments) is acceptable as equivalent to this segregation. For “on deck” stowage, this segregation means a separation by a distance of at least 6 m horizontally.

3)“Separated by a complete compartment or hold from”: Either a vertical or horizontal separation. If the intervening decks are not resistant to fire and liquid, then only a longitudinal separation (i.e., by an intervening complete compartment or hold) is acceptable. For “on deck” stowage, this segregation means a separation by a distance of at least 12 m horizontally. The same distance must be applied if one package is stowed “on deck”, and the other one in an upper compartment.

Note:

One of the two decks must be resistant to fire and liquid.

4)“Separated longitudinally by an intervening complete compartment or hold from”: Vertical separation alone does not meet this requirement. Between a package “under deck” and one “on deck” a minimum distance of 24 m including a complete compartment must be maintained longitudinally. For “on deck” stowage, this segregation means a separation by a distance of at least 24 m longitudinally.

Segregation Table:

X  - YES, they can load in the same container. Please check the IMDG      Code for further provisions.
1) - NO, they cannot load in the same container. Keep “away from”.
2) - NO, they cannot load in the same container. Keep “separated from”.
3) - NO, they cannot load in the same container. Keep “separated by a    complete compartment or hold from”.
4) - NO, they cannot load in the same container. Keep “separated longitudinally by an intervening complete compartment or hold from”.