ABS Hull inspection.pdf

Inspection Grading Criteria for the ABS Hull Inspection and Maintenance Program (HIMP)

NOTICE This manual and the inspection regime described herein are for use solely within the ABS Hull Inspection Maintenance Program (HIMP). The grading and actions to be taken on those gradings are of a suggested nature only. They are not to be construed as representative represent ative of ABS class criteria or the actions taken by class upon discovery of the various types of defects noted in this hull inspection grading manual. Owner inspections carried out utilizing this manual do not replace or substitute the classification survey require requirements ments as stated in IACS PR-33. IACS PR-33 Owner’s Hull Inspection and Maintenance Schemes Owner’s hull inspection and maintenance schemes are to be encouraged as means for maintaining compliance with classification and statutory requirements between surveys. However,, these schemes are not to be accepted as an alternative However to, or a substitute for, for, the performance p erformance of required classification and/or statutory surveys of the hull by the surveyors of the society, society, or of another duly authorized society. society. The surveyors may be assisted, where appropriate, appropriate, by service suppliers as defined in UR Z17.

NOTICE This manual and the inspection regime described herein are for use solely within the ABS Hull Inspection Maintenance Program (HIMP). The grading and actions to be taken on those gradings are of a suggested nature only. They are not to be construed as representative represent ative of ABS class criteria or the actions taken by class upon discovery of the various types of defects noted in this hull inspection grading manual. Owner inspections carried out utilizing this manual do not replace or substitute the classification survey require requirements ments as stated in IACS PR-33. IACS PR-33 Owner’s Hull Inspection and Maintenance Schemes Owner’s hull inspection and maintenance schemes are to be encouraged as means for maintaining compliance with classification and statutory requirements between surveys. However,, these schemes are not to be accepted as an alternative However to, or a substitute for, for, the performance p erformance of required classification and/or statutory surveys of the hull by the surveyors of the society, society, or of another duly authorized society. society. The surveyors may be assisted, where appropriate, appropriate, by service suppliers as defined in UR Z17.

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............ Surveyor ............ 59 Point Rating System ............ .......................... ........................... ....................... .......... 60

INSPECTION INSPECTIO N GRADING GRADING CRITERIA FOR ABS HIMP HIMP • 1

Introduction This manual should be utilized in accordance with the Hull Inspection and Maintenance Program (HIMP) outlined in the ABS Guide for Hull Inspection and Maintenance Program. Vessels enrolled in the program will be eligible for the HIMP class notation. This hull inspection grading manual details a program for hull structural inspections to be performed by qualified inspectors in order to comply with the ABS HIMP Guide. It outlines the work scope and reporting requirements for this vessel and contains the information to be collected by the vessel crew or superintendents. Staff executing the HIMP inspection regime are to be formally qualified by successfully completing the ABS approved HIMP training. The hull condition is to be assessed and rated in accordance with a set of six general condition criteria coupled with selected targeted inspections of identified critical areas for this design series. This manual draws on the information available from IMO, IACS and ABS publications. It is intended to support the sound judgment of qualified inspectors and assist owners with the development and application of a reliable maintenance program based on inspection and reporting techniques that are in conformance with the ABS HIMP Guide requirements.

2 • INSPECTION GRADING CRITERIA FOR ABS HIMP

This manual is to be used in conjunction with the following ABS publications: •

Guide for Hull Inspection and Maintenance Program

•

Rules for Building and Classing Steel Vessels, Part 7: Surveys after Construction

•

Guidance Notes for Inspection, Maintenance and Application of Marine Coatings

Attention should also be paid to the IACS guidelines for surveys, assessment and repair of hull structures for relevant ship types. The inspector is required to grade each particular zone on each of the six criteria. The scoring for a particular zone should not be influenced by the scoring of other inspection criteria in that compartment.

INSPECTION GRADING CRITERIA FOR ABS HIMP • 3

Inspection Criteria This manual identifies six different criteria to be addressed during the inspections. These are to be documented based on a traffic light point rating system (0 through 6 scale) on “zones” for each compartment (space or tank). The score assigned to a compartment will denote the compartment’s condition as good, fair or poor and will correspond to one of three colors, green, yellow or red. Table 1. Traffic Light Condition Scoring

GOOD CONDITION FAIR CONDITION POOR CONDITION The six inspection criteria cover: •

Coating condition

•

Presence of general corrosion

•

Presence of pitting or grooving or other localized linear corrosion

•

Presence of deformation

•

Presence of fractures

•

Compartment or space cleanliness (housekeeping and fabric maintenance such as anode replacement, etc.)


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 spot rusting. (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 areas under consideration, but less than as defined for POOR condition. (Score is 3 to 4 inclusive); and

•

POOR is a condition with general breakdown of coating over 20 percent or more of areas, or hard scale at 10 percent or more of areas under consideration. (Score is 5 to 6 inclusive)


Table 2. Coating Inspection Criteria Point Scoring r e o l d o o C C l e v e L k s i R

w o L

t n e m m o C n o i t i d n o C

g n i t a o c e l b i n g i w l o g e d k n , a e d r e t b a o c y l h s e r F

s t n i o P

0

g n i t a R

t n e l l e c x E

n g o i n t i t i a d o n C o C

m u i d e w M o L – w o L

h g i H – m u i d e M

h g i H

h g i H y r e V

g n i t a o c f o n % w 0 o 1 d r k e a v e o r b l a r e n e G



3

4

5

6

r i a F

r o o P – r i a F

r o o P

t s r o W

m u i d e M

s g f n n o o i i t t s a c e o g e g c n d n f n i e t o o t s c ) d a n u r w % n d e t l t 5 e a o o w r d w o p o e c s k v d n d a r k o u e n o a ( r a e n b i r s l r b M a e l r n a e e c n f o f e L i t G s 1

2

d o o G

r i a F – d o o G

d o o G

6 • INSPECTIO INSPECTION N GRADING GRADING CRITERIA FOR ABS HIMP HIMP

r i a F

r o o P

Coating Assessment Scale – Surfaces Assessment Scale for Breakdown

0.1%

0.2%

0.3%

0.5%

1%

2%

5%

10%

20%

25%

33%

50%

Diagram for Pitting Linear Extent

10%

15%

20%

Weld

Weld

Weld

INSPECTION INSPECTIO N GRADING GRADING CRITERIA FOR ABS HIMP HIMP • 7

Coating Coating Condition Go o d

Points

Condition Comment

0

Freshly coated, negligible coating breakdown

8 • INSPECTIO INSPECTION N GRADING GRADING CRITERIA FOR ABS HIMP HIMP

Color Code

Coating Condition

Points

Condition Comment

Good

1

Minor spot rusting

Color Code


Coating Condition

Points

Condition Comment

Good

2

General breakdown of coating over 5%


Color Code

Coating Condition Fair

Points

Condition Comment

3

Local breakdown at edges of stiffeners and weld connections (uncoated)

Color Code


Coating Condition

Points

Condition Comment

Fair

4



Color Code

Coating Condition

Points

Condition Comment

Poor

5


Color Code


Coating Condition

Points

Condition Comment

Poor

6



Color Code

General Corrosion General or overall corrosion appears as nonprotective rust which can uniformly occur on tank internal surfaces that are uncoated, or where coating has totally deteriorated. The rust scale continually breaks off, exposing fresh metal to corrosive attack. Material thickness loss cannot be judged visually until excessive loss has occurred.


Table 3. General Corrosion Inspection Criteria Point Scoring r e o l d o o C C l k e s v i e R L

w – m o u L w w i d o y o r L L e e M V

n

t o i n s o e g r r n i m o t c s / m g u n g r o i n t i C t s t o u s n r u p s o o r r i e t N o l i n b i i d g M n i l o g e C

N

s t n i o P

0 1

g n i t a R

t n e l l e c x E

2

– r d d i o a o o o G G F

t % s s u r a e t h n n g o o i i z % s f 0 L o % o r 5 r o < C

t s u r t h g i L % 0 2 <

m u i d e M

d l e w % 0 d n a 2 r e s v r e o n e g f n . i f i t e t n s s u o f r z o t f h s g o e i l g e r d r o e o / t m a d r n n a o s w n o o d i k t c a e e r n b n l o a c c o L

– m u h g i i d e H M

. e n o z f o e r o m r o

% 0 1 t a e l a c s d r a H

h g i H

h g i H y r e V

e l a c % s . 0 3 e v e r i n t u a t c h c t A u . r e t t r s o n e e s M h e t : r n f p f o i s i o s o e n l r e r l a l o a s f c c t e s n v a i a t h c c fi a r i o n d g n e s i a s o / o s n l u o s o i i s i r o e r S r o c

/ e y d r b n a o m d e i d r r o n a h % a p f m o 0 7 o n r c . o e c i a g v s n o o n i r , o n r i g n t o i n s c i h t : t t e u i n f o p q o i s n e g i o n c r i e r n d c e o u a c l d f r i c f v n u o i e s , a e g e l r n i a a t c s l a e v e p i s s e o n h o t e l t f x o o E r

3

4

5

6

r i a F

– r r o

i o a F P

r o o P

t s r o W

t e s l u r a c s t h g d r i L a H % % 0 2 5 > >

e l a c s d r a H % 0 1 >

e l a c s d r a H % 0 3 >

e l a c s d r a H % 0 7 >


Corrosion Extent Diagrams – Edges and Welds Localized Corrosion Extent Diagrams

2% localized breakdown

2% scattered breakdown





Linear Extent Diagrams

5% 10% 20% 50% 80% INSPECTION GRADING CRITE RIA FOR ABS HIMP • 17

Corrosion Corrosion as % of zone

Points

Condition Comment

0%

0

No rusting


Color Code

Corrosion as % of zone

Points

Condition Comment

< 5% Light rust

1

Negligible rusting/corrosion

Color Code



Points

Condition Comment

< 20% Light rust

2

Minor spot rusting


Color Code

Corrosion as % of zone > 20% Light rust > 5% Hard scale

Points

Condition Comment

3

Local breakdown at edges of stiffeners and weld connections and/or light rusting over 20% or more of zone

Color Code

INSPECTION GRADING CRITE RIA FOR ABS HIMP • 21


Points

Condition Comment

> 10% Hard scale

4

Hard scale at 10% or more of zone


Color Code

Corrosion as % of zone > 30% Hard scale

Points

Condition Comment

5

Serious/significant corrosion: More than 30% corrosion and active scale is present. Active scale is loose or has fallen off the structure.

Color Code



> 70% Hard scale

Points

Condition Comment

6

Extensive area of corrosion: corrosion of hard and/or loose scale, including pitting, over 70% or more of the plating surface in question accompanied by evidence of thinning.


Color Code

Pitting & Grooving Corrosion Localized corrosion can occur on bottom plating, other horizontal surfaces and at structural details that trap or follow the flow of water and other fluids, particularly in aft bays of tank bottoms and in the region of suction bell mouths. For coated surfaces, the attack produces deep and relatively small diameter pits that can lead to penetration of the steel member in isolated random places in the tank. Pitting of uncoated tanks, as it progresses, forms shallow but very wide scabby patches (e.g. 300 mm diameter). The appearance resembles a condition of general corrosion. Pitting is usually seen on horizontal hull parts such as the inner bottom or stringers. Grooving is a localized, linear corrosion which occurs at structural intersections in welds or heat affected zones. This corrosion is sometimes referred to as “in line pitting attack” and can also occur on vertical members and flush sides of bulkheads in way of flexing. Grooving or “necking” is usually seen on the butt/seam welds and weldments of stiffeners to plating. In particular pitting is found below the suction bell mouths in ballast tanks.


Table 4. Pitting & Grooving Inspection Criteria Point Scoring r e o l d o o C C

w o L

– m u i w d o L e M

m u i d e M

– m h u g i i d e H M

h g i H

—

% 5 <

% 5 1 <

% 5 1 >

% 5 1 <

% 5 1 >

h t p e D g n i v o o r G & g n i t t i P

—

s s e n k c i h t l a n i g i r o f o 3 / 1 n a h t s s e L



s s e n k c i h t l a n i g i r o f o 3 / 1 n a h t e r o M

s s e n k c i h t l a n i g i r o f o 3 / 1 n a h t e r o M

s s e n k c i h t l a n i g g i n r o i n i f o a m m e m r 6 n a h t s s e L

s t n i o P

0

1

2

3

4

5

6

g n i t a R

t n e l l e c x E

d o o G

r i a F

r o o P – r i a F

r o o P

t s r o W

/ s s e t i P v o o o r N G

/ s t s i P e v w o o o l l r a G h S

/ s t s i P e v w o o o l l r a G h S

/ s t s i v P e o p o e e r D G



l k e s v i e R L ) e y t i n s o n Z f e t o n I % (

/ g g n i e n v p i o t y t T i o P r G

w o L y r e V

r i a F

–

d o o G / s t s i P e v w o o o l l r a G h S


h g i H y r e V

—

Pitting & Grooving Pitting/ Grooving Type

Points

Pitting & Grooving Depth

Intensity (% of Zone)

No Pits/ Grooves

0

—

—

Color Code


Pitting/ Grooving Type Shallow Pits/ Grooves

Points



1

Less than 1/3 of original thickness

< 5%


Color Code


Points



2


< 15%

Color Code



Points



3


> 15%


Color Code

Pitting/ Grooving Type Deep Pits/ Grooves

Points



4

More than 1/3 of original thickness

< 15%

Color Code



Points



5

More than 1/3 of original thickness

> 15%


Color Code


Points



6

Less than 6 mm of original thickness remaining

—

Color Code


Deformation Deformation is caused by impact loads, contact or overloading. Deformation may be local (deformation of panel or stiffener) or global (deformation of a beam, frame, girder or floor including associated plating). Permanent buckling is easily identified and may result from overloading, reduction of thickness due to corrosion or contact damage. Elastic buckling may be identified from coating damage, stress lines and/or shedding of scale. The panel is defined as the area between adjacent transverse frames and adjacent longitudinal stiffeners. A bay is the area between adjacent transverse frames from longitudinal bulkhead to longitudinal bulkhead (or side shell).


Table 5. Deformation Inspection Criteria Point Scoring r e o l d o o C C l e v e L k s i R

w o L y r e V

– m u i w w d o L o L e M

m u i d e M


h g i H

h g i H y r e V

s d t e l e k k c c a u r b b d & n a l s d a e n r p e p t i r i T n

, d s l e t a n n r e e d t n i n i , d d e e l p k p c r u i B t

y d l e i p v p l a s i e r a t h n , , r d d e t e t e l n n i k c e u d n B i


n o i t a m r o f e d o N

n i t e s l a u d a r G

n i t e s l a u d a r G

d e t a d i e c p o p s i r s a t s l h t i a r w n t n e i n i t e S

s t n i o P

0

1

2

3

4

5

6

r i a F

r o o P – r i a F

r o o P

t s r o W

—

s y a B e l p i t l u M

g n i t a R h t p e D n i t e S

a e r A n i t e S

t n – d e r l d i o l a e o o o c G G F x E ) n i 3 ( — m m 5 7 < n o i t a m r o f e D o N

l e n a P n i h t i W

) n i 3 ( m m 5 7 >

) n i 3 ( m m 5 7 <

d e p p i r T

) n i 3 ( m m 5 7 >

l e n a P n i h t i W

e l p i t l u ) m l s ( e y a n B a p n i h t i W

s l a n r e t n I d n a s t e k c a r B

y a B n i h t i W


Deformation Set-in Area

No Deformation

Set-in Depth

—

Points

Condition Comment

0

No deformation


Color Code

Set-in Area

Set-in Depth

Points

Condition Comment

Within Panel

< 75 mm (3 in)

1

Gradual set-in

Color Code


Set-in Area

Set-in Depth

Points

Condition Comment

Within Panel

> 75 mm (3 in)

2

Gradual set-in


Color Code

Set-in Area

Within Bay (multiple panels)

Set-in Depth

< 75 mm (3 in)

Points

Condition Comment

3

Set-in with associated internals tripped

Color Code


Set-in Area

Brackets & Internals

Set-in Depth

Tripped

Points

Condition Comment

4

Tripped and buckled internals & brackets


Color Code

Set-in Area

Within Bay

Set-in Depth

> 75 mm (3 in)

Points

Condition Comment

5

Buckled, indented, tripped internals

Color Code


Set-in Area

Multiple Bays

Set-in Depth

—

Points

Condition Comment

6

Buckled, heavily indented, tripped internals


Color Code

Fracture Fractures are categorized by a different point system based on the location of the fracture and that local structure’s contribution to overall hull integrity. A fracture of the toe welds of brackets and flanges of brackets, stiffeners or webs is given 3 points. The fractures to the web plating of frames, floors and stiffeners are given 4 points. Fractures to transverse bulkheads and longitudinal bulkheads are given 5 points. Any fracture to the external hull envelope is treated as the worst case and given 6 points. Table 6. Fracture Inspection Criteria Point Scoring Fracture Location

Points

Condition Comment

Risk Level

No Fractures

0

No fractures

Very Low

Welds

3

Weld fractures in support brackets, internals, detachments

Low – Medium

Flanges

3

Flanges of brackets, internals, stiffeners

Medium

4

Webs of frames, floors, brackets, stiffeners, internals

Medium – High

5

Transverse & longitudinal bulkheads, primary structure members

High

6

Sideshell, bottom & deck

Very High

Webs

Bulkheads

Hull Envelope (Shell)

Color Code


Fracture Fracture Location

Points

Condition Comment

No Fractures

0

No fractures


Color Code

Fracture Location Welds

Points

Condition Comment

3

Weld fractures in support brackets, internals, detachments

Color Code


Fracture Location

Points

Condition Comment

Flanges

3

Flanges of brackets, internals, stiffeners


Color Code

Fracture Location

Points

Condition Comment

Webs

4

Webs of frames, floors, brackets, stiffeners, internals

Color Code


Fracture Location Bulkheads

Points

Condition Comment

5

Transverse & longitudinal bulkheads, primary structure members


Color Code

Fracture Location

Points

Condition Comment

Hull Envelope (Shell)

6

Sideshell, bottom & deck

Color Code


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/sludge remaining 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, entry spaces, ladders and other means of access

•

Loose scale and plugged drainage openings in the structure (e.g., rat holes/scallops)


Table 7. Cleanliness & Housekeeping Inspection Criteria Point Scoring r e o l d o o C C l k e s v i e R L

w o L y r e V

w o L

– m u i w d o L e M

t n o a n h t g n e i r n . o a p m e u l g n C e n o . s i t i n g i l i n o c i d a n r n i m o o a e f c r m d d e e o % r r i o 0 g 9 % u q 5 n i r 7 e s s e e d d o o n n A A

m u i d e M . l g u i n f g n n a i e n l e l a c e b l i a s M c s . o o l g p n s e i n i m i a n s o o i m t e e r r a i n u i q % m e 0 r 5 a x s e y a e d m o d n n A a


h g i H

. g e n i , k e n a l l a a u m e f c l s g h , i c n c t r i . e u h n t t l o a a w u h e , t c M i W c . fi t g . w i e f e n d e i s l v i n e n b i i u i c o t a d s e s t i f m s o a f e e p n r e i r t t r m o o % e a n n 0 n x s 3 i e e n a t o s i d e n t o d o a n c o i , A n n t r m A i a d x e

h g i H y r e V . e e v f i t a c s e f e f d e n a i s m e m b e . t o y s t r y s t s d n e n e r o e i o t n f c t e n t e o r p m t c r i a d p o m h t a o C C


n o i t i d n o c t l i u b y l w e n o t r a l i m i S

s t n i o P

0

1

2

3

4

5

6

g n i t a R

t n e l l e c x E

d o o G

– r d i o F o a G

r i a F

– r o r i o a F P

r o o P

t s r o W

s t n e m i d e s , s e n u o i d t i c s e r e p f s o i n r e y a l t h g i L

r , o e r n e e r i n o s n i f e o s g i a d t t o a n r a n r r a o o m o a i c n c r d , a l e t , e t r a s l i e e c d v e r d , y e e l l t r u t l a c r n a o a u t e c r i t s f . c c , , c r u t fi n f r e e t t o u i s s a s e t r a s w e u e m h d c r i m a s o t o o f r e p e S f r d

e l g n a c i s n i n a t o i n s o c o r r s o e c c a d f e r t u a s l u h t m i w u c c s a e c e a s p o S l o

s s e t c n a e f m r u i s d e s o t s d s n a e c c e a u d e i v s i e r g t h t i o n w o s d e h c c a i p h S w

s e d c n a a p s s s , e e e f c v a c s o a b t a f o o n o t s y n r n a o e t n i t m e i d h d t a i n I w

g n i p e e k e s u o H & s s e n i l n a e l C

n o i t i d n o c t n e l l e c x e d n a n a e l C

f o r s e t y n a l e m e i l d b i e g s i l d g n e a n , t e u h d g i i l s e y r r e V


Cleanliness & Housekeeping Cleanliness & Housekeeping

Points

Condition Comment

Clean and excellent condition

0

Similar to newly built condition


Color Code

Cleanliness & Housekeeping

Points

Condition Comment

Very light, negligible layer of residue and sediments

1

Anodes in good condition, more than 90% remaining

Color Code



Points

Condition Comment

Light layer of residue, sediments

2

Anodes 75% remaining. Cleaning not required for close-up.


Color Code

Cleanliness & Housekeeping Spaces sufficiently clean and free from water, scale, dirt, container residues, etc. to reveal corrosion, deformation or other structural deterioration

Points

Condition Comment

3

Anodes 50% remaining. Meaningful examination is possible and may require some local cleaning.

Color Code


Cleanliness & Housekeeping Spaces with surfaces containing loose accumulated corrosion scale

Points

Condition Comment

4

Anodes 30% remaining. Water, scale dirt, container residues, etc. which make examination difficult.


Color Code


Spaces with residue and sediments which do not give access to surfaces

Points

Condition Comment

5

Anodes not effective, Meaningful examination not possible with cleaning.

Color Code


Cleanliness & Housekeeping In addition to all other conditions, spaces with means of access and entry not safe

Points

Condition Comment

6

Cathodic protection systems ineffective. Compartment needs to be made safe for entry.


Color Code

Notifying Superintendent and Class Surveyor All deformation or fractures discovered during inspection should be brought to the attention of the superintendent (owner’s representative) and the attending class surveyor at the first opportunity. When a compartment transitions from good to fair condition, the class surveyor should be alerted at the next survey. When a compartment transitions to poor condition, class surveyor attendance should be requested at the next port of call. Having a comparison of the normalized total scores enables the owner to rank like compartments in terms of the overall condition. Such a ranking may further enable a class surveyor to focus surveys in compartments where anomalies and higher scores have been identified. Table 8. Suggested Notification Thresholds Inspection Criteria

Notify Superintendent

Coating Condition

> 3 points

General Corrosion

> 3 points

Pitting & Grooving Corrosion

> 3 points

Deformation

> 0 points

Fracture

> 0 points


> 3 points


ABS Hull inspection.pdf

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