1 Gauging is necessary to determine the general condition
of the structure and to define the extent of possible repairs and/or reinforcements of
the vertically corrugated transverse watertight bulkhead for verification of the
compliance with the bulk carrier bulkhead and double-bottom strength standards, defined
in regulation
XII/1.7 of the Convention.
2 Taking into account the buckling model specified in the
bulk carrier bulkhead and double-bottom strength standards, defined in regulation
XII/1.7 of the Convention, in the evaluation of strength of the bulkhead, it
is essential to determine the thickness diminution at the critical levels shown in
figures 1 and 2 of this annex.
3 The gauging should be carried out at the levels as
described below. To adequately assess the scantlings of each individual vertical
corrugation, each corrugation flange, web, shedder plate and gusset plate within each of
the levels given below should be gauged.
| Level (a)
|
Ships without lower stool (see figure
1):
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|
|
|
|
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Locations:
|
|
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- The mid-breadth of the
corrugation flanges at approximately 200 mm above the line of shedder
plates;
|
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- The middle of gusset
plates between corrugation flanges, where fitted;
|
|
|
- The middle of the
shedder plates;
|
|
|
- The mid-breadth of the
corrugation webs at approximately 200 mm above the line of shedder
plates.
|
| Level (b)
|
Ships with lower
stool (see figure 2):
|
|
|
|
|
|
Locations:
|
|
|
- The mid-breadth of
the corrugation flanges at approximately 200 mm above the line of shedder
plates;
|
|
|
- The middle of
gusset plates between corrugation flanges, where fitted;
|
|
|
- The middle of the
shedder plates;
|
|
|
- The mid-breadth of
the corrugation webs at approximately 200 mm above the line of shedder
plates.
|
| Level (c)
|
Ships with or without
lower stool (see figures 1 and 2):
|
|
|
|
|
|
Locations:
|
|
|
- The mid-breadth of
the corrugation flanges and webs at about the mid-height of the
corrugation.
|
4 Where the thickness changes within the horizontal
levels, the thinner plate should be gauged.
5 Steel renewal and/or reinforcement should comply
with the bulk carrier bulkhead and double-bottom strength standards,
defined in regulation XII/1.7 of
the Convention.
Figure 1 - Ships without lower stool
Figure 2 - Ships with lower stool