the why and how hull coatings can improve your bottom line - … · 2016. 7. 6. · hempaguard is...
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The WHY and HOW hull coatings can improve your bottom line
Naples Shipping Week 2016
Claes Skat-RørdamFouling Control Marketing Manager
30 June 2016
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Topics
o Friction - summary
o Fouling - effects
o Roughness - influence
o Video – time permitting
30 June 2016
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Friction
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Why hull coatings can improve your bottom line
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o Viscous resistance accounts for >70% of a vessels total resistanceoMore for slow steaming ships
o The biggest component of viscous friction is skin frictiono Skin friction can be reduced by:
1. Reduction of the wetted surface (linear reduction)
2. Speed reduction (quadratic reduction)
3. Improving the interaction between the wetted surface and the fluid (=seawater)
o 1 and 2 are very effective to reduce skin friction but will affect vessel’s operation
o 3 is also very effective and will not affect vessel’s operation.
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HEMPAGUARD is doing exactly this:
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Fue
l effi
cien
cy
Service time 60 mth.I
Antifouling
Fouling Release
HEMPAGUARD
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Fouling
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What has most effect – fouling or roughness?
8 30 June 2016
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Fouling condition Reduction in speed Increase in fuel
AHR 100 µm 0 0
AHR 200 µm 1,5% 4,5%
Light slime 3% 9%
Thick slime 9% 27%
Algae and small-sized shell fouling 17% 51%
Medium-sized shell fouling 27% 82%
Fouling has more influence than AHR!
Estimated effect of different hull conditions on the total shaft power (ST) for the case of a 7,000 TEU container ship.
Influence from different conditions
NACE international, vol. 50, no. 4, April 2011; “Materials Performance”
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What are you looking for?
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Small savings up fronto Apply an inexpensive hull coating
Big savings over timeo Apply a suitable hull coating
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Flexibility
oFuel savings and high idle capacity in one coating: Hempaguard
oDecisive parameters:
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Antifouling:
1. Water temperature
2. Vessel’s speed
3. Activity
Hempaguard:
1. Water temperature
Vessel’s speed
Activity
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Hempaguard – the most flexible hull coatingTest in India
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Why hull coatings can improve your bottom line
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USD 30,000,000,000per year spend on extra fuel due to
inadequate hull coatings1
≈ USD 500,000 per ship > 1,000 GT per year
1: DNV-GL webinar “Antifouling for Ships” 24 March 2015
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How hull coatings can improve your bottom line
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1. Avoid foulingo Apply a suitable hull coating
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Roughness
2230 June 2016
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Average years to first full blast
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HEMPEL’s database; 2780 vessels analysed
30 June 2016
0
5
10
15
20
BLK CHT CON GCV OTK REF
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Resistance increases with time
24 30 June 2016Dirksen & Gundermann, 2014
Townsin et al., 1986
Development in resistance / roughness without blasting
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Effects from blasting
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Kane, 2010
30 June 2016
Blasting approx. 50% of the hull resulted in 18% fuel saving
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How hull coatings can improve your bottom line
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1. Avoid foulingo Apply a suitable hull coating
2. Consider full blasting more often
30 June 2016
1 + 1 = 2
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See us more often
27 30 June 2016
We know what the coatings can do – and not do
We are experts in effectsof coatings..!
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Customer’s video
2830 June 2016
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https://www.youtube.com/watch?v=txSjsfTtQ_M
oPainting in order of appearanceoNexus tie-coat (grey/red)oHempathane top-coat (black)oHempaguard X7 hull coating (red)
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