Green OSV designs meeting high operational requirements

1 © Wärtsilä

Terje Nordtun Wärtsilä

OSV ConferenceOslo 11th – 12th October 2012

Wärtsilä Corporation

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Content

• Introduction– Market drivers, requirements

• Some achievements– Efficient designs– Use of LNG / Dual Fuel

• The VS 485 PSV Mark III– An unique design meeting the

highest DP rating without increasing installed propulsion power

3 © Wärtsilä

OSV Design – Main Drivers

Environment

InnovationOperation

Key issues for OSV owners / operators

• Reliability – No equipment break down / downtime• Operational capability – DP redundancy• “Green design” - Fuel efficiency – low emissions• Low cost• ……

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Conflicting requirements ???

Green Design and Operation

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Green design is about optimised hull lines and the propulsion equipment and solutions that are installed onboard

Green design requires detailed information about how the vessel is operated

Trend Change

Investment cost focus Operation Cost, Total Cost of Ownership

Using standard solutions Design based on specific operational needs

– E.G.• Optimised hull shape in relation to capacities / deadweight / speed• Machinery and Propulsion selection/optimization• Use of alternative fuels (LNG)• Energy management

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Operation Profile

Example 300 T BP AHTSMission profile

0

10

2030

40

50

Steaming 12knots

Steaming 15knots

DynPos light DynPos heavy Bollard

Mission (6000 hrs/year)

% o

f ope

ratio

n tim

e

Hybrid propulsion

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Green designs – some examples

Significant fuel savings

Dual-Fuel/ Gas applications

•World’s first LNG powered PSV in successful operations since 2003.

Fuel cell technology

•Flexible fuel (e.g. methanol or LNG)

•Approx. 30% higher efficiency than diesel engine

•Extremely low emissions•First installation on OSV in operation (350 kW)

•2500 dwt•12 knots•Fuel consumption reduced from 26 to 16 tons / 24 h

•1500 dwt•12 knots•Fuel consumption reduced from 13 to 7 tons / 24 h

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CO2

NOx

SOx

Particulates

Dual-Fuel enginein gas mode

Dieselengine

0

10

20

30

40

50

60

70

80

90

100

Emissionvalues [%]-25%

-85%

-100%

-100%

Emission advantage running on gas

Meeting IMO Tier III

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Dual-Fuel – The Preferred Ship Solution

• Redundancy, backup without interruptions in power or speed.• Able to operate on liquid fuel outside ECA-areas• Simple system, no additional back up or double gas system needed.• DP class fulfilled with single tank/gas supply system• Operational flexibility - Vessel re-routing possible, gas supply not a

limitation

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Innovations - WSD LNG References

2003 2005 2007 2009 2011 20132012 New concepts

VS 481 DF PSV

VS 4410 DF PSV

VS 499 PSV LNG

2 x VS 489 PSV LNG

VS 493 PSV Avant-LNG

VS 493 PSV Avant-LNG

2 x VS 4403 PSV LNG

3 x VS 794 CGV

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The VS 485 PSV Mark III

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- 86 m diesel86 m diesel--electric Platform Supply Vesselelectric Platform Supply Vessel-- Wartsila Low Loss Concept (LLC)Wartsila Low Loss Concept (LLC)

-- 4 x 1580 4 x 1580 kWekWe installed powerinstalled power-- DP2 with ERN (99,99,99,99)DP2 with ERN (99,99,99,99)

Environmental Regularity Number (ERN)

• A method developed by DNV to rate a vessels station keeping capability during Dynamic Positioning

• Consist of four numbers ranging ”the probable regularity for keeping position in a defined area”

• Format : ERN (a,b,c,d)– a: Optimal use of all thrusters– b: Minimum effect of a single

thruster failure– c: Maximum effect of a single

thruster failure– d: The effect of the worst case

single failure

• Highest possible ERN rating: (99,99,99,99)

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Wärtsilä Low Loss Concept (LLC)

Main propulsion

Electrical motor

Variable speed drivesBow thrusters

Main propulsion

Electrical motor

Main generators

Main switchboard

Reduced electric lossesHigher redundancy

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Wärtsilä LLC – Measured Electric Losses

Main propulsion

Electrical motor

Main switchboard

Electric propulsion losses

4-7% measured in full scale

Viking Queen

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Wärtsilä LLC – ERN (99,99,99,99)

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FWD Azimuth

880kW

M

LLC Unit

1600 kVABus Link

690V/ 60Hz

Bus A1Bus B2

LLC Unit

1600 kVA

TT Fwd 1

1000kW

M

Propulsion PS

2300kW

M

Propulsion SB

2300kW

M

TT Fwd 2

1000kW

M

Bus A2 Bus B1

1580 kWe G41580 kWe G31580 kWe G21580 kWe G1

Worst case single failure

Conventional 2-split system

5 December 2012 Presentation name / Author18 © Wärtsilä

PROPULSION PS2300KW

PROPULSION SB2300KW

690kV / 60Hz Bus B (STBD)

1580 kWe G2 1580 kWe G4

Bus A (port)

1580 kWe G1 1580 kWe G3

MM

MM

M

TT FWD 11000 KW

AZIMUTH FWD

880 KW

TT FWD 21000KW

Worst case single failure

ERN (99,99,99,55)

Bus A (Port)

ERN (99,99,99,99) with 2-split system

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690kV / 60Hz Bus B (STBD)

2440 kWe G2 2440 kWe G42440 kWe G1 2440 kWe G3

MM

MM

M

Azimuth FWD880 KW

TT FWD 22100KW

Propulsion SB 2100KW

Propulsion PS 2100KW

TT FWD 12100KW

+ 54%

+ 110% + 110%

Alternative method - DP Capability Plots

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LLC – Bus A1 out

LLC – Fwd tunnel out

2-split – Bus A out

Wind (knots)

Max wind during DP:- LLC : 35 knots- 2-split : 15 knots

Typical PSV Operation Profile

87 %

48 %

22 % 56 %

19 %

15 % 5 %

0 %

5 %

10 %

15 %

20 %

25 %

30 %

35 %

Steaming, 14,5 knots

Steaming, 12 knots

Steaming, 10 knots

DP rough weather

DP good weather Standby Harbour

Operation time

4 2 1 3 2 1 1

Installed power LLC: 6320 kWe

Total power utilisation

No. of eng. running

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Comparison of fuel consumption

• 9% fuel saving and reduced emissions caused by:– Reduced electric losses in the Wärtsilä LLC– More optimum (higher) individual engine loads during operation

(gives better fuel efficiency)

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2- split SWB – 9760 kWe Wärtsilä LLC – 6320 kWe

4000 t/year 3700 t/year (- 9%)

Orders with LLC & ERN (99,99,99,99)

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VS 485 PSV MK III for Vestland Offshore VS 485 PSV MK III L for Atlantic Offshore

VS 4412 PSV DF for Remøy Shipping VS 4411 PSV DF for Siem Offshore

Summary

• Detailed information about the vessel operation is crucial for green vessel designs meeting demanding operational requirements

• Use of LNG/Dual Fuel engines will in addition to the reduced emissions, give operational benefits with the inherent redundancy

• The Wärtsilä Low Loss Concept makes it possible to meet the highest ERN rating without increasing installed engine/thrusterpower:– Significant cost, space and weight savings for the machinery and

propulsion system– Reduced fuel consumption due to reduced electric losses and better

engine utilisation

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Thank you for your attention

terje.nordtun@wartsila.com

Thank you for your attention

terje.nordtun@wartsila.com