MrMurakami

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Coating conditions in water ballast tank, void space and

cargo oil tank of aged ships and required performance

standard of protective coatings for new ships

Takanobu Murakami (SKDY)Takanobu Murakami (SKDY)

Takayuki Sasaki (IHIMU)Takayuki Sasaki (IHIMU) Masahiro Kuwajima (MES)Masahiro Kuwajima (MES) Masanobu Koori (MHI)Masanobu Koori (MHI)

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2Introduction

by NMRI and SAJby NMRI and SAJ

With regard to the expansion of the

standard to void spaces and cargo oil tanks,

NMRI (National Maritime Research Institute)and SAJ (the Shipbuilders Association of

JAPAN) carried out the inspection of shipsto clarify the actual coating conditions of

aged ships in order to know the necessary

specification and application of coating for

15 years target life.

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2New regulations for painting2-1For Water Ballast Tanks

Dedicated seaw ater ballas t tan k for all kin d o f ship s of no t less than 500 g rosstonnag e and doub le sk in sp aces in BC of 150m in leng th and upw ard

Application

or w hich the bu ildin g contract is p laced o n or after 1 July 2008; o r n the ab sence of a b ui ld in g contract, the k eels of wh ich are la id or w hich are

at a sim ilar stag e of con struction on or after 1 January 2009; o r he d elivery of wh ich is on or after 1 July 2012

Coatingtechnical files

The coating technical fi les should be k ept on the ship w hich w as establ ished ina rule

In sp ector FROSIO level or NACE level2 or eq uiva len tEpoxy type multi-coat system with two stripe coatsoating systemCoating system shall pass pre-qualif ication test

NDFT 320m w ith 90/10 ru leFree ed ge Roun ded 2m m or b y three p ass g rin din g or eq uivalen tDam aged SP Blasted to Sa21/2Butts Treated to St3 or b etter. Sm al l d am ag es u p to 2% of total area sh all b e treatedSt3, an d continuo us d am ades o ver 25m 2 or over 2% of total area of the tank shall

be treated to Sa21/2 respectively.Oth ers Req uirem en ts of ciu cu m stan ce, su rface clean lin ess su ch as o il con tam in ation ,du st, w ater solub le salts are precribed

Guid elin e Guid elin e fo r imp l ementa tio n of MSC.215(82) is b ein g d is cussed in IACS/JW G fo rpractical and cons istent app lication

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2New regulations for painting2-2For Void Spaces (DE50)

Bulk Carrier and Oil Tanker onlypplicationThe standard (PSPC for VS) are not mandatoryCoating

technical filesThe coating technical f i les should be kept on the ship

In sp ector FROSIO level or NACE level2 or eq uivalen tEpoxy type (one spary or two spray) system with one stripe coat (stripe coatshou ld be ap pl ied on thermal ly cut free edg es and sm al l holes only

Coating systemCoating system sh all p ass p re-qualif ication testNDFT 200m w ith 90/10 ru le

Free edg e one pass g rind ing or eq u ivalentDam ag ed SP Blasted to Sa2 or St3Butts Treated to St3 or better or Sa2 w here p racticab leOth ers Req uirem en ts of ciu cu m stan ce, su rface clean lin ess su ch as o il con tam in ation ,

w ater solub le salts are precribedNMRI, SAJ and other Japanese representatives proposed the

practical standard based on the inspection results for VS of aged

ships while the meeting in DE50 on this March.

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2New regulations for painting2-3For Cargo tanks (on JWG)

DE50 instructed the correspondence group to develop the draft new SOLASregulation regarding cargo oil tank protection for the discussion at DE51.

The development of PSPC for cargo oil tanks will be further considered atDE51.

MRI, SAJ and other Japanese representatives submitted the proposal of using

corrosion resistance steel in the cargo oil tanks as an alternative.

And we participate in the meeting of correspondence group and discussion forpractical and consistence application.

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3Report on the coating condition of actual ships3-1Inspected ships

Ship A Ship B Ship CType of sh ip Tanker (VLCC) Tanker (VLCC) Bulk Carrier (Panam ax)Age of sh ip 15 years o ld 12 yaers o ld 11 years o ldSh ipyard Japanese Japanese JapaneseOperator Japanese com pany Japanese com pany Japanese com panyMajo r sea rou te East Asia M id dle Eas t Eas t As ia Midd le East East Asia - Ocean ia

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3Report on the coating condition of actual ships3-2Water ballast tanks

Ship A Ship B Ship CType of pain t Tar Epoxy pa in t Tar Epoxy pain t Tar Epoxy pain tDFT 200m(1 spray) 200m(1 spray) 220m(1 spray)Stripe coat Not app lied Holes and narrow

spacesNot applied

Primary surfacepreparation

Sa2.5 (shot blast)IZP



Free edg e Rem oved burrs 1 p ass g rind ing 1 pass g rind ingteelcondition W eld bead No treatm ent No treatm ent No treatm entSurface treatm ent St3 St3 Sa2. 5 (Partally St3)

3-2-1Coating specifications in water ballast tanks

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3-2-2Overview in the water ballast tanks (Ship A)

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3-2-3Overview in the water ballast tanks (Ship B)

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3-2-4Overview in the water ballast tanks (Ship C)

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3Report on the coating condition of actual ships3-3Void spaces

Ship A Ship B Ship CCoating type Alkyd based Tar epoxy Surface-tolerant epoxyDFT 70m (2 sp ray) 125m (1 sp ray) 100m (1 sp ray)Stripe coat Not app l ied Not app lied Not app liedPrimary surfacepreparation Sa2.5 (shot blast)IZP Sa2.5 (shot blast)IZP Sa2.5 (shot blast)IZP

Free edg e No treatm ent No treatm ent No treatm entW eld bead No treatm ent No treatm en t No treatm ent

Steelcondition

W eld s p atter Loose sp atter to b eremoved by scraper

Loose spatter to beremoved by scraper

Loose spatter to beremoved by scraper

Grade St2(By disk sand erand /or pow er brus h)

Between St2 and St3(By d isk san der an d/orpow er brush)

Loose rust to bebrushed off

SurfacetreatmentTreated area Dam aged shop

pr imer, w elds andrusted areas

Damaged shop pr imer,w elds and rusted

areasDamag ed shop pr imer ,

w elds and rustedareas

W ater so lub le salt Rem oved to the extent invis ib le to the naked eyeOil contam ination Rem oved , the traces m ay be vis ib le

3-3-1Coating specifications in void spaces

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3-3-2Overview in the void spaces (Ship A)

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3-3-3Overview in the void spaces (Ship B)

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3-3-4Overview in the void spaces (Ship C)

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3Report on the coating condition of actual ships3-4Cargo oil tanks

Ship A Ship B Ship CCoating type Tar epoxy Tar epoxy -DFT 200m

(1 spray)200m

(1 spray)-

Stripe coat Not app lied Holes and narrowspaces -Primary surfacepreparation



-Free edg e Rem oved burrs 1 pass g rind ing -teel

condition W eld bead No treatm ent No treatm en t -Surface treatm ent St3 St3 -

3-4-1Coating specifications in slop tanks

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3Report on the coating condition of actual ships3-4Cargo oil tanks

3-4-2Overview in the slop tanks (Ship A)

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3Report on the coating condition of actual ships3-4Cargo tanks

3-4-3Overview in the slop tanks (Ship B)

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4Conclusion4-1Water ballast tanks

Deck head area under upper deck seems to be in quite severeenvironment condition.

Rust is initiated from edges and welds, and good treatment on edges

and welds will prevent rust initiated.

Apparently, coating specifications of the ships for water ballast tanksat new building dont satisfy 15 years coating life.

New regulation will become very effective for protection in water

ballast tanks by the painting specifications.

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4Conclusion4-2Void spaces

Although all inspected ships had been in use for 10 to 15 years,

coating in void spaces were still almost perfect condition.

Very small local corrosions were observed in the areas prone to bedamaged mechanically. These areas estimated smaller than 0.1% of

the total area.Coating specifications of the ships in the void spaces at new building

are sufficient for 15 years coating life.

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4Conclusion4-3Cargo oil tanks

Coatings in the cargo tanks were comparatively in better conditionthan those in water ballast tanks.

Though some corrosions were observed in deck head areas, plate loss

was quite small, while re-coating or plate renewal was necessary for

some of deck head areas in water ballast tanks of the same ship.

Therefore, PSPC for cargo tanks could be relaxed compared with

those require by PSPC for water ballast tanks.

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Thank you very much for your attention!!

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