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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
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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
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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
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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
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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
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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
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In-water treatment
Surface characteristics
Surface characteristics of STC are very different from conventionalantifoulings
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- 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
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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
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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
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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
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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
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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
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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
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STC as hull protection
Belgian Navy: 9 vessels
Tugboat underwater hull after
conditioning
Crocus, Mine Hunter
STC as hull protection
M/V Courcheville LPG Tanker
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STC as hull protection
APL Agate Container ship 5000 TEU
STC General cargo ship
Before STC
STC after one year
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STC for rudders
Superior and effective protection
STC after one year: excellent
rudder condition
Before STC
STC as propeller protection
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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
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STC and ship hull performance
Thank you
Maxim Candries
Acknowledgements:
http://www.hydrex.be/life_index.htm