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NOTICE
This manual and the inspection regime described herein are foruse solely within the ABS Hull Inspection Maintenance Program(HIMP). The grading and actions to be taken on those gradingsare of a suggested nature only. They are not to be construed asrepresentative of ABS class criteria or the actions taken by classupon discovery of the various types of defects noted in this hullinspection grading manual.
Owner inspections carried out utilizing this manual do not replaceor substitute the classification survey requirements as stated inIACS PR-33.
IACS PR-33 Owners Hull Inspection and Maintenance SchemesOwners hull inspection and maintenance schemes are to
be encouraged as means for maintaining compliance withclassification and statutory requirements between surveys.However, these schemes are not to be accepted as an alternativeto, or a substitute for, the performance of required classificationand/or statutory surveys of the hull by the surveyors of the society,or of another duly authorized society. The surveyors may beassisted, where appropriate, by service suppliers as defined inUR Z17.
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INSPECTION GRADING CRITERIA FOR ABS HIMP 1
Table of Contents
Introduction ............................................................... 2
Inspection Criteria..................................................... 4
Coating Condition..................................................... 5
General Corrosion ....................................................15
Pitting & Grooving Corrosion................................. 25
Deformation............................................................. 34
Fracture .................................................................... 43
Cleanliness & Housekeeping................................... 50
Notifying Superintendent & Class Surveyor............ 59
Point Rating System................................................. 60
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2 INSPECTION GRADING CRITERIA FOR ABS HIMP
Introduction
This manual should be utilized in accordance with
the Hull Inspection and Maintenance Program(HIMP) outlined in the ABS Guide for Hull Inspectionand Maintenance Program. Vessels enrolled in theprogram will be eligible for the HIMP class notation.
This hull inspection grading manual details a program
for hull structural inspections to be performed byqualified inspectors in order to comply with theABS HIMP Guide. It outlines the work scope andreporting requirements for this vessel and containsthe information to be collected by the vessel crew orsuperintendents. Staff executing the HIMP inspection
regime are to be formally qualified by successfullycompleting the ABS approved HIMP training.The hull condition is to be assessed and rated inaccordance with a set of six general conditioncriteria coupled with selected targeted inspectionsof identified critical areas for this design series.
This manual draws on the information available fromIMO, IACS and ABS publications. It is intended tosupport the sound judgment of qualified inspectorsand assist owners with the development and appli-cation of a reliable maintenance program based
on inspection and reporting techniques that are inconformance with the ABS HIMP Guide requirements.
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INSPECTION GRADING CRITERIA FOR ABS HIMP 3
This manual is to be used in conjunction with thefollowing ABS publications:
Guide for Hull Inspection and Maintenance Program
Rules for Building and Classing Steel Vessels, Part7: Surveys after Construction
Guidance Notes for Inspection, Maintenance andApplication of Marine Coatings
Attention should also be paid to the IACS guidelinesfor surveys, assessment and repair of hull structuresfor relevant ship types.
The inspector is required to grade each particularzone on each of the six criteria. The scoring for
a particular zone should not be influenced bythe scoring of other inspection criteria in thatcompartment.
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4 INSPECTION GRADING CRITERIA FOR ABS HIMP
Inspection Criteria
This manual identifies six different criteria to be
addressed during the inspections. These are to bedocumented based on a traffic light point ratingsystem (0 through 6 scale) on zones for eachcompartment (space or tank). The score assignedto a compartment will denote the compartmentscondition as good, fair or poor and will correspond
to one of three colors, green, yellow or red.
The six inspection criteria cover:
Coating condition
Presence of general corrosion
Presence of pitting or grooving or other localizedlinear corrosion
Presence of deformation
Presence of fractures
Compartment or space cleanliness (housekeepingand fabric maintenance such as anode replace-ment, etc.)
GOOD CONDITION
FAIR CONDITION
POOR CONDITION
Table 1. Traffic Light Condition Scoring
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INSPECTION GRADING CRITERIA FOR ABS HIMP 5
Coating Condition
The coating condition is defined as per ABS Rule
requirements and the ABS Guide for Inspection,Maintenance and Application of Marine Coatings:
GOOD is a condition with only minor spotrusting. (Score is 0 to 2 inclusive)
FAIR is a condition with local breakdown at
edges of stiffeners and weld connections and/or light rusting over 20 percent or more of areasunder consideration, but less than as defined forPOOR condition. (Score is 3 to 4 inclusive); and
POOR is a condition with general breakdownof coating over 20 percent or more of areas, or
hard scale at 10 percent or more of areas underconsideration. (Score is 5 to 6 inclusive)
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6
INSPECTIONGRA
DING
CRITERIA
FOR
ABSHIMP
CoatingCondition
Rating Points Condition Comme
Good
Excellent 0Freshly coated, negligible
breakdown
Good 1 Minor spot rusting
Good Fair 2General breakdown of c
over 5%
Fair
Fair 3Local breakdown at ed
stiffeners and weld conn
(uncoated)
Fair Poor 4General breakdown of c
over 10%
Poor
Poor 5General breakdown of c
over 20%
Worst 6General breakdown of c
over 30%
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INSPECTION GRADING CRITERIA FOR ABS HIMP 7
Coating Assessment Scale Surfaces
Assessment Scale for Breakdown
0.1%
1%
20%
Weld
Weld
Weld
10%
15%
20%
0.5%
10%
50%
0.2%
2%
25%
0.3%
5%
33%
Diagram for Pitting Linear Extent
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8 INSPECTION GRADING CRITERIA FOR ABS HIMP
Coating
CoatingCondition
Points Condition CommentColorCode
Good 0Freshly coated, negligible
coating breakdown
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INSPECTION GRADING CRITERIA FOR ABS HIMP 9
CoatingCondition
Points Condition CommentColorCode
Good 1 Minor spot rusting
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10 INSPECTION GRADING CRITERIA FOR ABS HIMP
CoatingCondition
Points Condition CommentColorCode
Good 2
General breakdown of
coating over 5%
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INSPECTION GRADING CRITERIA FOR ABS HIMP 11
CoatingCondition
Points Condition CommentColorCode
Fair 3
Local breakdown at edges
of stiffeners and weldconnections (uncoated)
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12 INSPECTION GRADING CRITERIA FOR ABS HIMP
CoatingCondition
Points Condition CommentColorCode
Fair 4
General breakdown of coating
over 10%
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INSPECTION GRADING CRITERIA FOR ABS HIMP 13
CoatingCondition
Points Condition CommentColorCode
Poor 5
General breakdown of coating
over 20%
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14 INSPECTION GRADING CRITERIA FOR ABS HIMP
CoatingCondition
Points Condition CommentColorCode
Poor 6
General breakdown of coating
over 30%
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INSPECTION GRADING CRITERIA FOR ABS HIMP 15
General Corrosion
General or overall corrosion appears as non-
protective rust which can uniformly occur on tankinternal surfaces that are uncoated, or where coatinghas totally deteriorated. The rust scale continuallybreaks off, exposing fresh metal to corrosive attack.Material thickness loss cannot be judged visuallyuntil excessive loss has occurred.
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16
INSPECTIONGR
ADING
CRITERIA
FOR
ABSHIMP
Corrosion as %of zone
Rating Points Condition Comm
0% Excellent 0 No rusting
< 5% Light rust Good 1 Negligible rusting/cor
< 20% Light rustGood
Fair2 Minor spot rustin
> 20% Light rust> 5% Hard scale
Fair 3Local breakdown at edges of sti
connections and/or light rustor more of zone
> 10% Hard scale Fair Poor 4 Hard scale at 10% or mo
> 30% Hard scale Poor 5Serious/significant corrosion: M
corrosion and active scale is preis loose or has fallen off th
> 70% Hard scale Worst 6
Extensive area of corrosion: corro
or loose scale, including pitting, oof the plating surface in question
evidence of thinni
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INSPECTION GRADING CRITE RIA FOR ABS HIMP 17
Corrosion Extent Diagrams Edges and Welds
Localized Corrosion Extent Diagrams
Linear Extent Diagrams
2% localizedbreakdown
15% scatteredbreakdown
2% scatteredbreakdown
20% scatteredbreakdown
10% scatteredbreakdown
30% scatteredbreakdown
5%
10%
20%
50%
80%
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18 INSPECTION GRADING CRITERIA FOR ABS HIMP
Corrosion
Corrosion as% of zone
Points Condition CommentColorCode
0% 0 No rusting
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INSPECTION GRADING CRITERIA FOR ABS HIMP 19
Corrosion as% of zone
Points Condition CommentColorCode
< 5% Light
rust 1 Negligible rusting/corrosion
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20 INSPECTION GRADING CRITERIA FOR ABS HIMP
Corrosion as% of zone
Points Condition CommentColorCode
< 20% Light
rust 2 Minor spot rusting
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INSPECTION GRADING CRITE RIA FOR ABS HIMP 21
Corrosion as% of zone
Points Condition CommentColorCode
> 20% Lightrust
> 5% Hardscale
3
Local breakdown at edges
of stiffeners and weldconnections and/or light
rusting over 20% ormore of zone
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22 INSPECTION GRADING CRITERIA FOR ABS HIMP
Corrosion as% of zone
Points Condition CommentColorCode
> 10% Hard
scale 4
Hard scale at 10%
or more of zone
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INSPECTION GRADING CRITERIA FOR ABS HIMP 23
Corrosion as% of zone
Points Condition CommentColorCode
> 30% Hardscale
5
Serious/significant corrosion:
More than 30% corrosion andactive scale is present. Active
scale is loose or has fallenoff the structure.
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24 INSPECTION GRADING CRITERIA FOR ABS HIMP
Corrosion as% of zone
Points Condition CommentColorCode
> 70% Hardscale
6
Extensive area of corrosion:corrosion of hard and/or
loose scale, including pitting,over 70% or more of the
plating surface in questionaccompanied by evidence of
thinning.
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INSPECTION GRADING CRITERIA FOR ABS HIMP 25
Pitting & Grooving Corrosion
Localized corrosion can occur on bottom plating,
other horizontal surfaces and at structural detailsthat trap or follow the flow of water and other fluids,particularly in aft bays of tank bottoms and in theregion of suction bell mouths. For coated surfaces,the attack produces deep and relatively smalldiameter pits that can lead to penetration of the steel
member in isolated random places in the tank.
Pitting of uncoated tanks, as it progresses, formsshallow but very wide scabby patches (e.g. 300 mmdiameter). The appearance resembles a conditionof general corrosion. Pitting is usually seen on
horizontal hull parts such as the inner bottom orstringers.
Grooving is a localized, linear corrosion whichoccurs at structural intersections in welds or heataffected zones. This corrosion is sometimes referred
to as in line pitting attack and can also occur onvertical members and flush sides of bulkheads inway of flexing. Grooving or necking is usually seenon the butt/seam welds and weldments of stiffenersto plating. In particular pitting is found below thesuction bell mouths in ballast tanks.
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26
INSPECTIONGR
ADING
CRITERIA
FOR
ABSHIMP
Pitting/Grooving
TypeRating Points Pitting & Grooving Depth
No Pits/Grooves Excellent 0
Shallow Pits/Grooves
Good 1 Less than 1/3 of original thickness
Shallow Pits/Grooves
Good Fair 2 Less than 1/3 of original thickness
Shallow Pits/Grooves
Fair 3 Less than 1/3 of original thickness
Deep Pits/Grooves
Fair Poor 4 More than 1/3 of original thickness
Deep Pits/Grooves
Poor 5 More than 1/3 of original thickness
Deep Pits/Grooves
Worst 6Less than 6 mm of original thickness
remaining
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INSPECTION GRADING CRITERIA FOR ABS HIMP 27
Pitting & Grooving
Pitting/
GroovingType Points
Pitting &
Grooving Depth
Intensity
(% of Zone)
Color
Code
No Pits/Grooves
0
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28 INSPECTION GRADING CRITERIA FOR ABS HIMP
Pitting/Grooving
TypePoints
Pitting &Grooving Depth
Intensity(% ofZone)
ColorCode
ShallowPits/
Grooves1
Less than 1/3 oforiginal thickness
< 5%
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INSPECTION GRADING CRITERIA FOR ABS HIMP 29
Pitting/Grooving
TypePoints
Pitting &Grooving Depth
Intensity(% ofZone)
ColorCode
ShallowPits/
Grooves2
Less than 1/3of originalthickness
< 15%
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30 INSPECTION GRADING CRITERIA FOR ABS HIMP
Pitting/Grooving
TypePoints
Pitting &Grooving Depth
Intensity(% ofZone)
ColorCode
ShallowPits/
Grooves3
Less than 1/3 oforiginal thickness
> 15%
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INSPECTION GRADING CRITERIA FOR ABS HIMP 31
Pitting/Grooving
TypePoints
Pitting &Grooving Depth
Intensity(% ofZone)
ColorCode
DeepPits/
Grooves4
More than 1/3 oforiginal thickness
< 15%
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32 INSPECTION GRADING CRITERIA FOR ABS HIMP
Pitting/Grooving
TypePoints
Pitting &Grooving Depth
Intensity(% ofZone)
ColorCode
DeepPits/
Grooves5
More than1/3 of original
thickness> 15%
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INSPECTION GRADING CRITERIA FOR ABS HIMP 33
Pitting/Grooving
TypePoints
Pitting &Grooving Depth
Intensity(% ofZone)
ColorCode
DeepPits/
Grooves6
Less than 6 mmof originalthicknessremaining
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34 INSPECTION GRADING CRITERIA FOR ABS HIMP
Deformation
Deformation is caused by impact loads, contact or
overloading. Deformation may be local (deformationof panel or stiffener) or global (deformation of abeam, frame, girder or floor including associatedplating). Permanent buckling is easily identified andmay result from overloading, reduction of thicknessdue to corrosion or contact damage. Elastic buckling
may be identified from coating damage, stress linesand/or shedding of scale.
The panel is defined as the area between adjacenttransverse frames and adjacent longitudinal stiffeners.A bay is the area between adjacent transverse frames
from longitudinal bulkhead to longitudinal bulkhead(or side shell).
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INSPECTIONGRADING
CRITE
RIA
FOR
ABSHIMP
35
Set-in Area Set-in Depth Rating Points Cond
No Deformation Excellent 0 No
Within Panel < 75 mm (3 in) Good 1 Gr
Within Panel > 75 mm (3 in)Good
Fair2 Gr
Within Bay (multiplepanels)
< 75 mm (3 in) Fair 3 Set-ininte
Brackets and Internals Tripped Fair Poor 4Trippinter
Within Bay > 75 mm (3 in) Poor 5
Buck
trip
Multiple Bays Worst 6Bucinde
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36 INSPECTION GRADING CRITERIA FOR ABS HIMP
Deformation
Set-in Area
Set-in
Depth Points
Condition
Comment
Color
Code
NoDeformation
0No
deformation
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38 INSPECTION GRADING CRITERIA FOR ABS HIMP
Set-in AreaSet-inDepth
PointsConditionComment
ColorCode
Within Panel> 75 mm
(3 in)2
Gradualset-in
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INSPECTION GRADING CRITERIA FOR ABS HIMP 39
Set-in AreaSet-inDepth
PointsConditionComment
ColorCode
Within Bay(multiplepanels)
< 75 mm(3 in)
3
Set-in withassociatedinternalstripped
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40 INSPECTION GRADING CRITERIA FOR ABS HIMP
Set-in AreaSet-inDepth
PointsConditionComment
ColorCode
Brackets &Internals
Tripped 4
Tripped andbuckled
internals &brackets
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INSPECTION GRADING CRITERIA FOR ABS HIMP 41
Set-in AreaSet-inDepth
PointsConditionComment
ColorCode
Within Bay> 75 mm
(3 in)5
Buckled,indented,tripped
internals
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42 INSPECTION GRADING CRITERIA FOR ABS HIMP
Set-in AreaSet-inDepth
PointsConditionComment
ColorCode
Multiple Bays 6
Buckled,heavily
indented,tripped
internals
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INSPECTION GRADING CRITERIA FOR ABS HIMP 43
Fracture
Location Points
Condition
Comment
Risk
Level
Color
Code
NoFractures
0 No fracturesVeryLow
Welds 3Weld fractures insupport brackets,
internals, detachments
Low Medium
Flanges 3Flanges of brackets,internals, stiffeners
Medium
Webs 4Webs of frames,floors, brackets,
stiffeners, internals
Medium High
Bulkheads 5Transverse &longitudinal
bulkheads, primarystructure members
High
HullEnvelope
(Shell)6
Sideshell, bottom& deck
VeryHigh
Fracture
Fractures are categorized by a different point system
based on the location of the fracture and that localstructures contribution to overall hull integrity. Afracture of the toe welds of brackets and flanges ofbrackets, stiffeners or webs is given 3 points. Thefractures to the web plating of frames, floors andstiffeners are given 4 points. Fractures to transverse
bulkheads and longitudinal bulkheads are given5 points. Any fracture to the external hull envelopeis treated as the worst case and given 6 points.
Table 6. Fracture Inspection Criteria Point Scoring
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44 INSPECTION GRADING CRITERIA FOR ABS HIMP
Fracture
FractureLocation
Points Condition CommentColorCode
NoFractures
0 No fractures
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INSPECTION GRADING CRITERIA FOR ABS HIMP 45
FractureLocation
Points Condition CommentColorCode
Welds 3
Weld fractures in support
brackets, internals,detachments
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46 INSPECTION GRADING CRITERIA FOR ABS HIMP
FractureLocation
Points Condition CommentColorCode
Flanges 3
Flanges of brackets,
internals, stiffeners
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INSPECTION GRADING CRITERIA FOR ABS HIMP 47
FractureLocation
Points Condition CommentColorCode
Webs 4
Webs of frames, floors, brackets,
stiffeners, internals
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48 INSPECTION GRADING CRITERIA FOR ABS HIMP
FractureLocation
Points Condition CommentColorCode
Bulkheads 5
Transverse & longitudinal
bulkheads, primary structuremembers
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INSPECTION GRADING CRITERIA FOR ABS HIMP 49
FractureLocation
Points Condition CommentColorCode
Hull
Envelope(Shell)
6 Sideshell, bottom & deck
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50 INSPECTION GRADING CRITERIA FOR ABS HIMP
Cleanliness & Housekeeping
This criteria is used to evaluate the general condition
of the compartment for cleanliness and housekeeping.This should be judged based on the following:
Amount of the sediments and dredge/sludgeremaining in the tank
Wastage of the anodes and their perceived
effectiveness General cleanliness of the space
Condition of the piping and its supports
Condition of access hatches, manholes, entryspaces, ladders and other means of access
Loose scale and plugged drainage openings in thestructure (e.g., rat holes/scallops)
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INSPECTIONGRADING
CRITE
RIA
FOR
ABSHIMP
51
Cleanliness & Housekeeping Rating Points Condition
Clean and excellent condition Excellent 0 Similar to newl
Very light, negligible layer ofresidue and sediments
Good 1Anodes in good co
90% re
Light layer of residue, sedimentsinspections
Good Fair
2Anodes 75% rema
required fo
Spaces sufficiently clean and free
from water, scale, dirt, containerresidues etc. to reveal corrosion,
deformation, fractures, damages or
other structural deterioration
Fair 3Anodes 50% rem
examinatioand may require s
Spaces with surfaces containingloose accumulated corrosion scale
Fair Poor
4Anodes 30% rema
dirt, container residexaminati
Spaces with residue and sedimentswhich do not give access to surfaces
Poor 5Anodes not effe
examination not poss
In addition to above, spaceswith means of access and
entry not safeWorst 6
Cathodic protectionCompartment nee
for e
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52 INSPECTION GRADING CRITERIA FOR ABS HIMP
Cleanliness & Housekeeping
Cleanliness &Housekeeping
Points Condition CommentColorCode
Clean andexcellentcondition
0 Similar to newly built condition
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INSPECTION GRADING CRITERIA FOR ABS HIMP 53
Cleanliness &Housekeeping
Points Condition CommentColorCode
Very light, negligible
layer of residue andsediments
1Anodes in good condition,more than 90% remaining
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54 INSPECTION GRADING CRITERIA FOR ABS HIMP
Cleanliness &Housekeeping
Points Condition CommentColorCode
Light layer ofresidue, sediments 2
Anodes 75% remaining. Cleaningnot required for close-up.
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56 INSPECTION GRADING CRITERIA FOR ABS HIMP
Cleanliness & Housekeeping Points Condition CommentColorCode
Spaces with surfaces
containing looseaccumulated corrosion
scale
4
Anodes 30% remaining.
Water, scale dirt, containerresidues, etc. which make
examination difficult.
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INSPECTION GRADING CRITERIA FOR ABS HIMP 57
Cleanliness & Housekeeping Points Condition CommentColorCode
Spaces with residue andsediments which do notgive access to surfaces
5
Anodes not effective,
Meaningful examinationnot possible with
cleaning.
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58 INSPECTION GRADING CRITERIA FOR ABS HIMP
Cleanliness & Housekeeping Points Condition CommentColorCode
In addition to all other
conditions, spaces withmeans of access and
entry not safe
6
Cathodic protection
systems ineffective.Compartment needs to be
made safe for entry.
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INSPECTION GRADING CRITERIA FOR ABS HIMP 59
Notifying Superintendent
and Class Surveyor
All deformation or fractures discovered duringinspection should be brought to the attention ofthe superintendent (owners representative) andthe attending class surveyor at the first opportunity.
When a compartment transitions from good to faircondition, the class surveyor should be alerted atthe next survey. When a compartment transitions topoor condition, class surveyor attendance should berequested at the next port of call.
Having a comparison of the normalized total scores
enables the owner to rank like compartments interms of the overall condition. Such a ranking mayfurther enable a class surveyor to focus surveys incompartments where anomalies and higher scoreshave been identified.
Table 8. Suggested Notification Thresholds
Inspection CriteriaNotify
Superintendent
Coating Condition > 3 points
General Corrosion > 3 points
Pitting & Grooving Corrosion > 3 points
Deformation > 0 points
Fracture > 0 points
Cleanliness & Housekeeping > 3 points
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ABS WORLD HEADQUARTERS
Tel: 1-281-877-5800 Fax: 1-281-877-5803
Email: [email protected]
ABS EUROPE DIVISION
Tel: 44-20-7247-3255 Fax: 44-20-7377-2453
Email: [email protected]
ABS PACIFIC DIVISION
Tel: 65-6276-8700 Fax: 65-6276-8711Email: [email protected]
ABS AMERICAS DIVISION
Tel: 1-281-877-6000 Fax: 1-281-877-6001
Email: [email protected]
Website
www.eagle.org