3.4 Special requirement for "on-deck" stowage

3.4.1 Prohibition of stowage directly above clear gaps

CTUs containing dangerous goods should not be stowed in the vertical lines specified by "X" in figure 3.4.1, above cargo holds fitted with partially weathertight hatchway covers having a clear gap, unless the cargo hold complies with the relevant requirements for the class and flash point of the dangerous goods in SOLAS regulation II-2/19. When "not in the same vertical line unless separated by a deck" is required in the IMDG Code and CTUs containing dangerous goods are stowed in position "X", as shown in figure 3.4.1 below, CTUs containing incompatible dangerous goods should not be stowed under deck in vertical lines indicated by "C" in figures 3.2.3-1 or 3.2.3-2.

Figure 3.4.1 Illustration of prohibited stowage of dangerous goods

3.4.2 Special requirement for on deck stowage of CTUs above hatchway covers without effective gutterbars

Where hatchway covers are not fitted with effective gutterbars, CTUs containing dangerous goods should not be stowed in the vertical lines specified by "A" in figures 3.2.3-1 and 3.2.3-2, above cargo holds fitted with partially weathertight hatchway covers, unless the cargo hold complies with the relevant requirements for the class and flash point of the dangerous goods in SOLAS regulation II-2/19.

3.4.3 On deck stowage of CTUs above cargo hold with effective gutterbars

Where hatchway covers are fitted with effective gutterbars, CTUs containing dangerous goods can be stowed in all vertical lines specified by "A" and "B" in figures 3.2.3-1 and 3.2.3-2 except as provided in paragraph 3.4.1, above cargo holds fitted with partially weathertight hatchway covers, regardless of whether the cargo hold under the hatchway cover complies with the relevant requirements in SOLAS regulation II-2/19.