2.2.1 Tank top ceiling: if, as often happens,
cracks appear between the ceiling boards, food material may be forced
down into the underlying space and serve as a focus of infestation
for an indefinite period. Insects bred in this space can readily move
out to attack food cargoes and establish their progeny in them.
2.2.2 'Tween-deck centre lines, wooden feeders
and bins are often left in place for several voyages and because of
their construction are frequent sources of infestation. After unloading
a grain cargo, burlap and battens covering the narrow spaces between
the planks should be removed and discarded before the holds are cleaned
or washed down. These coverings should be replaced by new material
in preparation for the next cargo.
2.2.3 Transverse beams and longitudinal deck girders
which support the decks and hatch openings may have an L-shaped angle-bar
construction. Such girders provide ledges where grain may lodge when
bulk cargoes are unloaded. The ledges are often in inaccessible places
overlooked during cleaning operations.
2.2.4 Insulated bulkheads near engine-rooms: when
the hold side of an engine-room bulkhead is insulated with a wooden
sheathing, the air space and the cracks between the boards often become
filled with grain and other material. Sometimes the air space is filled
with insulating material which may become heavily infested and serves
as a place for insect breeding. Temporary wooden bulkheads also provide
an ideal place for insect breeding, especially under moist conditions,
such as when green lumber is used.
2.2.5 Cargo battens: the crevices at the sparring
cleats are ideal places for material to lodge and for insects to hide.
2.2.6 Bilges: insects in accumulations of food
material are often found in these spaces.
2.2.7 Electrical conduit casings: sometimes the
sheet-metal covering is damaged by general cargo and when bulk grain
is loaded later, the casings may become completely filled. This residual
grain has often been found to be heavily infested. Casings that are
damaged should be repaired immediately or, where possible, they should
be replaced with steel strapping, which can be cleaned more easily.
2.2.8 Other places where material accumulates
and where insects breed and hide include:
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.1 the area underneath burlap, which is used to
cover limber boards and sometimes to cover tank top ceilings;
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.2 boxing around pipes, especially if it is broken;
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.3 corners, where old cereal material is often
found;
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.4 crevices at plate landings, frames and chocks;
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.5 wooden coverings of manholes or wells leading
to double-bottom tanks or other places;
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.6 cracks in the wooden ceiling protecting the
propeller shaft tunnel;
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.7 beneath rusty scale and old paint on the inside
of hull plates;
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.8 shifting boards;
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.9 dunnage material, empty bags and used separation
cloths; and
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.10 inside lockers.