The WHY and HOW hull coatings can improve your bottom line

Naples Shipping Week 2016

Claes Skat-RørdamFouling Control Marketing Manager

30 June 2016

Topics

o Friction - summary

o Fouling - effects

o Roughness - influence

o Video – time permitting

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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

Fouling

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What has most effect – fouling or roughness?

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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”

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

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

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Average years to first full blast

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HEMPEL’s database; 2780 vessels analysed

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0

5

10

15

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BLK CHT CON GCV OTK REF

Resistance increases with time

24 30 June 2016Dirksen & Gundermann, 2014

Townsin et al., 1986

Development in resistance / roughness without blasting

Effects from blasting

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Kane, 2010

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Blasting approx. 50% of the hull resulted in 18% fuel saving

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

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1 + 1 = 2

See us more often

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We know what the coatings can do – and not do

We are experts in effectsof coatings..!

Customer’s video

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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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