Marine Coatings

8/2/2019 Marine Coatings

1/19

Maxim Candries

Hydrex nv / Subsea Industries nv

International Marine and Offshore Coatings Conference

May 18, 2009

Surface Treated CoatingsSurface Treated Coatings

and Ship Hull Performanceand Ship Hull Performance

BACKGROUND

Hydrex nv : 35 years of underwater ship hull maintenance and repairs

Subsea Industries nv : 25 years of underwater maintenance technology


2/19

What are Surface Treated Coatings?

The working principleof a Surface TreatedCoating (STC)exists in providing a total package whereby a highly

durable coating is treated inwater resulting in an

extensivelyprolongedservicelife

Environmentallysafe:

biocidefree

lowVOC

alienspeciesmigrationsolution

Typical STC formulation

Main components are vinyl ester resin containing a high volume ofglassplatelets

Impermeable barrier that protects against corrosion and marinefouling

Extremelydurable


3/19

Durable protection

Interscan - M/V Patriot

Conventional paint system after 18 months STC after 2 years on same vessel and subject

to same conditions as earlier period

Hull protection

M/V Patriot After three winters operating in ice


4/19

Superior icebreaker strength

Section with both STC and conventional ice breaker paint

Conventional paint section shows impact damage and corrosion

STC section has no impact damage or corrosion

Ice breaker paint

STC

Durable protection

Nordgard General cargo ship

STC after one year: aft area

STC after one year:

superficial scratches of

anchor chain barely affect

paint film


5/19

STC: Treatment

Designed for frequent inwater treatment, improvingsurfacecharacteristicsallalong

Inwatertreatmentconsistsoftwoaspects:

Conditioning: improvessurfacecharacteristics

Cleaning:

Removes

all

fouling Continuestoreducesurfaceroughness

STC: the conditioning aspect

Conditioningisaninwatertreatmentthatimprovessurfacecharacteristics

Surfaceisrenderedharder,smootherandmoreimpermeable bythesurfacealignmentofembeddedglassflakesmakingitmoredifficultforfoulingorganismstoattach:goodmechanicalantifouling

Underwater

roughnessis

reduced with

each

future

underwater

hull

cleaning:shiphullperformanceimproves

Not conditioned Conditioned


6/19

Treatment: special technology of cleaning and conditioning

Conditioning improves the surface characteristics of the coating Cleaning removes any marine fouling in an early stage of development

Conditioning and cleaning may be done simultaneously

Typical cross-sections of STC at different stages: (a) newly applied (b) after conditioning(c) gradual exposition to re-attaching fouling organisms (d) after cleaning/conditioning

Efficient in-water treatment

Surface treatment or conditioning carried out with patentedtechnology

Powerfulhullmaintenancedevices

STCkeepsimprovingasshownby+500treatments


7/19

In-water treatment

Surface characteristics

Surface characteristics of STC are very different from conventionalantifoulings


8/19

- Towing tank tests carried out with 5m long friction plates- 4 surfaces tested: uncoated, conventional coating, STC newly appliedand conditioned STC

Frictional resistance characteristics

- Compared to the conventional paint system, the frictional resistancewas measured to be 7.7% lower for the freshly applied STC and 9.6%lower for the conditioned STC.

- Full-scale extrapolations point to 4% reduction in fuel savings

Frictional resistance characteristics


9/19

STC and ship hull performance: EU LIFE Research Project

Fuelconsumption

monitoring

of

ships

coated

with

Ecospeed

is

comparedwithsistershipscoatedwithSPCs

Estimationofreducedfuelemissions(CO2,NOx,SOx)

Evaluationandtesting:noreleaseoftoxicmatterwhile

cleaning/conditioning

R&Dinoptimizedhullcleaningtechnology

Costbenefitmodeltodetermineoptimumcleaninginterval

http://www.hydrex.be/life_index.htm

Optimum treatment interval


10/19

Causes of added resistance

Causes of increased fuel consumption Corrosion Fouling Multiple layers

Fuel savings by monitoring added resistance

STC solution

Durable protection

No fouling penetration

Once in a lifetime


11/19

Optimum treatment interval

Optimizeinterval formaximumsavings(fuel,emissions,costs)

No STC:

440ft cruise vessel after 4-month stationary period

encrusting organisms

paint system failure and breakdown

corrosion


12/19

440ft cruise vessel after 9-month stationary period

STCs are not damaged by aggressive fouling

12-yr docking interval

- STC last lifetime of vessel

- Any replacements such as stern

tube seals, bow thrusters and

stabilizers can be carried out

underwater

12-yr docking interval


13/19

Belgian Navy: Godetia, Supply Ship

Drydock inspection, after 3 years

Only a few minor touch-ups were carried out

STC in combination with repairs afloat

Royal Dutch Navy: underwater bow thruster repair

in flexible mobdock environment


14/19

STC in combination with repairs afloat

In-situ underwater stern tube seal repairs

using flexible mobdock

Belgian Navy: Aster, Mine Hunter

Drydock inspection, after 5 years:

STC in pristine condition, no touch-ups required


15/19

STC as hull protection

Belgian Navy: 9 vessels

Tugboat underwater hull after

conditioning

Crocus, Mine Hunter


M/V Courcheville LPG Tanker


16/19


APL Agate Container ship 5000 TEU

STC General cargo ship

Before STC

STC after one year


17/19

STC for rudders

Superior and effective protection

STC after one year: excellent

rudder condition

Before STC

STC as propeller protection


18/19

STC

Cruise liner LOA 290+ m

STCandshiphullperformance As a once in a lifetime coating, no repainting is necessary

for the lifetime of the vessel, except for sporadic touch-ups

Drydocking time can be extended: 12 year interval feasible

Provides extremely high levels of protection againstcorrosion, pitting, mechanical impact and cavitation

STC unaffected by aggressive fouling after long stationaryperiods in tropical waters

Fuel savings will be realized by enhanced hydrodynamicqualities after hull conditioning treatment

Increased speeds can be sustained throughout the hullslifetime by optimized treatment interval

Non-toxic


19/19

STC and ship hull performance

Thank you

Maxim Candries

[email protected]

Acknowledgements:

http://www.hydrex.be/life_index.htm

Documents

Marine Coatings