18 If separate hatches are used to access the
ladders required in each cargo hold, each hatch should have a clear
opening of at least 600 mm by 600 mm. The access hatch and associated
ladders should, unless used solely for inspection and maintenance
and not for operational access, be located such that a person using
them will not enter the volume defined by the vertical projection
upwards and downwards of the uppermost cargo hatchway. Accesses and
ladders should be so arranged that personnel equipped with self-contained
breathing apparatus may readily enter and leave the cargo hold. Access
hatch coamings having a height greater than 450 mm should be fitted
with steps or footholds inside the coaming and, if greater than 900
mm, should also have steps on the outside in conjunction with cargo
hold ladders.
Access within cargo holds and ballast tanks
19 Each cargo hold should be provided with at
least two ladders as far apart as practicable longitudinally, If possible,
these ladders should be arranged diagonally, e.g., one ladder near
the forward bulkhead on the port side, the other one near the aft
bulkhead on the starboard side, from the ship's centreline. Ladders
should be so designed and arranged that the risk of damage from the
cargo handling gear is minimised.
20 Vertical ladders should be at an angle of not
less than 70° to the horizontal and should comprise one or more
ladder linking platforms spaced not more than 6 m apart vertically
and displaced to one side of the ladder. Adjacent sections of ladder
should be laterally offset from each other by at least the width of
the ladder.
21 Tunnels passing through cargo holds should
be equipped with ladders or steps at each end of the hold so that
personnel may easily get across such tunnels.
22 Where is may be necessary for work to be carried
out within a cargo hold or ballast tanks, consideration should be
given to suitable arrangements for the safe handling of staging or
movable platforms. Such staging and platforms should always be adequately
supported and fitted with handrails. Planks should be free from splits
and lashed down. In topside and lower hopper tanks, it may be necessary
to arrange staging to provide close-up examination of the upper parts
of the tank, particularly the transverse web frames, especially where
protective coatings have broken down or have not been applied.
23 Hydraulic arm vehicles (“Cherry Pickers")
may be used for close-up examination of the cargo hold bulkheads and
the upper parts of the cargo hold structure. The standing platform
should be fitted with a safety harness. For those vehicles equipped
with a self-levelling platform, care should be taken so that the locking
device is engaged after completion of manoeuvring to ensure that the
platform is fixed.
24 Extending/articulated ladders (frame walk)
may be used to enable close-up examination of both the lower and upper
portions of side shell frames and end brackets. These ladders incorporate
a hydraulic locking system and a built-in safety harness. Portable
equipment requires regular maintenance and inspection and this should
be confirmed prior to its use.
25 When a short portable ladder is used to gain
access to the lower portion of the side shell plating, frames and
lower brackets, they should be fitted with adjustable feet, lashings
or other safe means, to prevent them from slipping and falling.