The rentability of an Offshore Windfarm is in large scale subjected to the availibility and the costs of the service ships in use. Horns Rev 08-05-11, 09:30 UTC, photo by Odo Hütter
The conventional way for Offshore Service Seastates and wave heights determine the service concept Conventional ships goes towards large and heavy service vessels with respective costs Helicopter Service Percent of occurance (%) 120 100 80 60 40 20 0 Percentage sign. wave hight culminative percentage 96 98 100 88 80 67 41 32 26 9 9 13 8 8 2 2 0-0,5 0,5-1,0 1,0-1,5 1,5-2,0 2,0-2,5 2,5-3,5 3,5-4,5 4,5+ Sign. wave height (m) Source : BSH Fino1 / 2009
The Baltec way for Offshore Service 1. New OceanRunner vessel design 2. New Rolling Jack transfer system 3. Light weight ship construction Helicopter Service Percent of occurance (%) 120 100 80 60 40 20 0 Percentage sign. wave hight culminative percentage 96 98 100 88 80 67 41 32 26 9 9 13 8 8 2 2 0-0,5 0,5-1,0 1,0-1,5 1,5-2,0 2,0-2,5 2,5-3,5 3,5-4,5 4,5+ Sign. wave height (m) Source : BSH Fino1 / 2009
1. OceanRunner hull design 2. RollingJack TransferSystem 3. Light weight design Wave canal tested design: The key to more sea worthiness and low vertical accelleration: open foredeck forward drooping stem slender hull lines A240 Vertical Acceleration Sea from bow Acceleration m/s² 9,00 8,00 7,00 6,00 5,00 4,00 3,00 2,00 1,00 0,00 13,50 18,50 23,60 Speed kn 3,0m 2,4m 1,2m Optimal seagoing behaviour (exceeds 0.6g only in very large waves and speeds NORFORSK recommend.) Fast sailing in rough offshore sea conditions Volvo IPS drives and joystick steering for easy stern landing operation
1. OceanRunner hull design 2. RollingJack TransferSystem 3. Light weight design A240 on a 4m wave Constant height during docking Stern up - jack down Stern down jack up Complete decoupling of platform from ship motion = Safe transfer of personal and material onto wind mill in up to 2.5m sign. waves
Optimised service vessels for farshore windfarms 1. OceanRunner hull design 2. RollingJack TransferSystem 3. Light weight design Pre-manufactured sandwich panels made of glas-epoxy prepreg laminats combined with a light weight core material. Repeatable high quality standards even in low inflammability type are available. A weight reduction up to 50% is achieved (comp. to aluminium vessels) and results in: fuel savings more then 1000 ltr./day only small engine requirements below 750kW (handleable for captains with smaller patent) very low impact energy to the windmill during docking operations
Optimised service vessels for farshore windfarms Costs of different ship concepts far shore Ship costs per dayfar shore Invest costs: Pay out time: 10years Interest rate: 6% 10000 9000 costs / day 8000 7000 6000 Fuel costs / day 5000 Ship costs / day 4000 3000 2000 Operating conditions: Distance to the wind park 30nm Distance in the wind park 3nm Crew on ship 2 Boarding time for 1 Team 7min Fuel costs / ltr. 70ct Technicians (6x2) 12 Set up time per WEC 2std. WEC s per Team and day 3st 1000 0 25m Swath 26m TwinAxe 24m Baltec Shiptypes
Optimised service vessels for farshore windfarms Difference of ship costs for an 80 WEC windpark Baltec A240 compared to Damen TwinAxe Difference of ship costs per year Service days Fuel costs / litre Number of ships Difference of ship costs app. Projection for 20 years Service days per year Fuel costs / litre Number of ships Difference of ship costs app. 250 0,70 2 1,4 Mio 250 1,4 2 40 Mio
Optimised service vessels for farshore windfarms Conclusions The use of light weight OceanRunner offshore cats in combination with the Rolling Jack Transfer system brings the following benefits to Offshore Windfarm Service: 1. New hull design for more sea worthiness and low vertical accelleration 2. Rolling Jack Transfer System for save access on the windmills 3. Low weight ships minimizes the impact energy and bring down the costs The effect is: Save offshore crew logistic with very low cost Thank you.