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 a frequent source 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 airspace and the cracks between the boards often
become filled with grain and other material. Sometimes the airspace
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:
The area underneath burlap, which is used to cover limber boards
and sometimes to cover tank top ceilings.
Boxing around
pipes, especially if it is broken.
Corners, where old
cereal material is often found.
Crevices at plate landings,
frames and chocks.
Wooden coverings of manholes or wells
leading to double-bottom tanks or other places.
Cracks
in the wooden ceiling protecting the propeller shaft tunnel.
Beneath rusty scale and old paint on the inside of hull plates.
Shifting boards.
Dunnage material, empty bags and
used separation cloths.
Inside lockers.