Transport Guidance for Steel Cargoes

American Club: Transport Guidance for Steel Cargoes
48
(10) if the consignment of steel coils is not large enough to fill the entire cargo hold, coils
should be loaded at the after part of the cargo hold adjacent to the aft bulkhead to
minimize the risks of movement or shifting forward and aft during transit. Incomplete
rows that do not cover the entire hold width from side to side should be avoided.
Upon coming to completion of the loading operation, consideration should be made
of the numbers and sizes of coils still yet to be loaded. This will enable the crew
and stevedores to plan and stow the cargo so incomplete rows can be avoided;
(11) cargo hold geometry can have a significant impact upon coil stowage arrangements
and the volume of cargo that can be carried in these holds. This is particularly true
for the forward and aft cargo holds which tend to have irregular geometries. In such
cases, it is also important to consider the loads on sloping hopper tanks, as seen in
Figure 5.1, if cargo is likely to be loaded upon them;
(12) similarly, coil weight and dimensions can have an impact upon stowage and securing
arrangements in the cargo space. Figures 5.7 to 5.20 show examples of various
practical configurations depending upon various coil sizes and other contributing factors;
(13) the classification society may be able to offer assistance to calculate the permissible
steel coil load for the vessel. One classification society suggests that as a rule of
thumb, when loading steel coils the total cargo weight in the hold should not exceed
half of the maximum permissible loads for evenly distributed weight in that cargo
hold.; and
(14) palleted steel coils. Steel coils that are palleted are normally stowed with the “eye
to the sky” as seen in Figure 5.21. These coils are usually high value cargo when
compared to usual cold rolled steel coils. The palleted coils are stowed directly onto
the tank top, one against the other. Chocking by timber dunnage may be necessary
between some coils and between outboard coils and the vessel’s side structures.
When palleted coils are stowed in more than one tier, dunnage is placed on top of
the steel coils, in order not to damage coils stowed underneath and nailed together,
not just placed as individual pieces of dunnage. This is because individual pieces
are prone to movement, and if the dunnage moves, the coils underneath are likely
to sustain damage to their edges. In addition, any cargo stowed on top should not
be so heavy that the coils stowed underneath could be damaged.
5.5.2.2 Coiled steel wire rods. Coiled rods are normally stowed in athwartships rows with the
“eye” of the coil in a fore and aft direction. The maximum number of tiers that coiled
wire rods can be stacked is subject to many factors, such as the weight of the coils,

American Club: Transport Guidance for Steel Cargoes
49
rigidity of the packing, and stowage of the coils. The shipper and/or manufacturer should
be consulted if there is any doubt.
Care should be taken to ensure that outer coils, particularly on lower tiers are properly
protected from the vessel’s side shell frames as coils pressed against the side shell frames
can cause deformation damage as seen in Figure 1.2.
Coiled wire rods can also be stacked on top of other steel products as seen in Figure 4.2,
but other cargo items should not be stowed on top of a stowage of coil wire rod because
the coils are likely to be deformed by the superimposed weight.
5.5.2.3 Steel plates and bundled steel sheets, steel slabs, billets and blooms. Steel plates,
sheets, slabs, etc. have a tendency to shift if not properly dunnaged (see Section 4.2.1(2)).
Therefore, the following should be considered for dunnaging these cargoes.
(1) Wood dunnage of sufficient length to reach across the width of the steel pieces, or a
number of pieces, should be placed athwartships on the tank top and then between
each tier so that the dunnaging is in a vertical line as seen in Figure 5.22. This
dunnaging should be properly spaced horizontally between the steel pieces to
prevent deformation as seen in Figure 5.23.
(2) If dunnage is not vertically aligned and properly horizontally spaced the possibility of
permanent plate deformation during transit as can occur as seen in Figures 1.9 and
5.23. Steel slab, due to its thickness, is not normally at risk of deformation as steel
plate, but the same practice for dunnage placement is recommended as best practice.
(3) Particular care should be taken when stowing steel plate or slab in a non-vertically
aligned stack, such as on sloping hopper tanks. This is particularly the case when
stowing elongated plates or slabs along sloping hopper tanks as seen in Figures 5.24
and 5.25. Dunnage should be arranged along the hopper tanks for their protection
taking into account the following considerations:
(i)
wooden dunnage placed fore and aft for plates or slabs will not necessarily be
vertically aligned, although wooden dunnage placed athwartships is a
recommended practice as noted above in Section 5.5.2.3(1) along the length of
the elongated plate;
(ii)
for steel plates stowed in a fore and aft direction when stowing steel plate
adjacent to hopper tanks, dunnage running fore and aft will be required.
However, that dunnage may not necessarily be aligned vertically as seen in

tải về 1.97 Mb.

Chia sẻ với bạn bè của bạn: