4.1.1 The condition of the coating in ballast
tanks is assigned and categorized as “GOOD”, “FAIR”
or “POOR”, based on visual inspection and estimated percentage
of areas with coating failure and rusty surfaces.
4.1.2 The definitions of coating conditions “GOOD”,
“FAIR” and “POOR” in the Guidelines on the
enhanced programme of inspections during surveys of bulk carriers
and oil tankers (resolution A.744(18)) are
as follows:
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GOOD:
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Condition with only minor spot
rusting.
|
|
FAIR:
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Condition with local breakdown of
coating at edges of stiffeners and weld connections and/or light rusting
over 20% or more of areas under consideration, but less than as defined for
POOR condition.
|
|
POOR:
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Condition with general breakdown of
coating over 20% or more of areas or hard scale at 10% or more of areas
under consideration.
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4.1.3 These Guidelines clarify the above definitions
in order to achieve unified assessment of coating conditions as follows,
see also table 1 below:
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GOOD:
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Condition with spot rusting on less
than 3% of the area under consideration without visible failure of the
coating. Rusting at edges or welds, should be on less than 20% of edges or
weld lines in the area under consideration.
|
|
FAIR:
|
Condition with breakdown of coating
or rust penetration on less than 20% of the area under consideration. Hard
rust scale should be less than 10% of the area under consideration. Rusting
at edges or welds should be on less than 50% of edges or weld lines in the
area under consideration.
|
|
POOR:
|
Condition with breakdown of coating
or rust penetration on more than 20% or hard rust scale on more than 10% of
the area under consideration or local breakdown concentrated at edges or
welds on more than 50% of edges or weld lines in the area under
consideration.
|
|
|
GOOD (3)
|
FAIR
|
POOR
|
| Breakdown of coating or
area rusted (1)
|
<
3%
|
3 -
20%
|
>
20%
|
| Area of hard rust scale
(1)
|
–
|
<
10%
|
≥
10%
|
| Local breakdown of coating or rust on
edges or weld lines (2)
|
<
20%
|
20 -
50%
|
> 50%
|
|
Notes:
|
| 1
|
% is the percentage calculated on basis of the area under
consideration or of the “critical structural area”
|
| 2
|
% is the percentage calculated on basis of edges or weld lines in
the area under consideration or of the “critical structural area”
|
| 3
|
spot rusting, i.e. rusting in spot without visible failure of
coating
|
4.1.4 The above clarifications are further exemplified
in IACS Recommendation 87 via photographs along with narrative descriptions
of the condition and uniform and localized assessment scalesfootnote.