VESSEL REVIEW | Sea Puffin 1 – A new concept for wind farm crew transfer

Photo: / Nere G Skomedal
Photo: / Nere G Skomedal

Built by Denmark’s Esbjerg Shipyard to an ESNA design, Sea Puffin 1 is the first of a new generation of high-performance daughter craft based on surface effect ship (SES) technology.

She was designed for offshore wind operations with transfer of technicians between turbines, motherships and port. Utilising SES technology, she offers very low fuel oil consumption and an operational wave height comparable to significantly larger crew transfer vessels.

The vessel creates an air cushion between the two catamaran side hulls and rubber skirts forward and aft. A centrifugal air fan, positioned in the “nose” forward of the deckhouse, blows air into this cushion and provides an overpressure that lifts the vessel out of the water.

Typically, up to 80 per cent of the vessel weight is lifted by this air cushion. This principle greatly reduces vessel resistance and provides low fuel oil consumption during transit.

The design was developed by Norwegian design office ESNA, which also supplied the SES equipment and the control system that governs it.

When accessing wind turbines, the ESNA control system uses the air cushion to efficiently dampen the heave motion of the vessel. This reduces vertical motion of the vessel and allows turbine access in significantly higher wave heights than other vessels of the same size.

During initial sea trials non-sliding push-on turbine transfers have been demonstrated successfully in 1.5-metre significant wave height.

Supplied with a single-hook and painter line systems for davit lifting operation, the vessel can be lifted on to and operate from a SOV, platform or other mother ships. She is also fully IACS classed so that she can transit to port with technicians and cargo.

The owner WindPartner and designer ESNA have a long-term cooperation agreement with plans to build a series of this vessel type over the next few years.

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Sea Puffin 1
Type of vessel: OSV – WFSV
Class: BV
Classification: + HULL MACH Light Ship – Fast passenger vessel, Sea area 2
Port of registry: Kristiansand, Norway
Flag: Norway
Owner: WindPartner, Norway
Designer: ESNA, Norway
Builder: Esbjerg Shipyard, Denmark
Construction material: Aluminium
Length overall: 15.9 metres
Length: 14.93 metres
Beam: 5.7 metres
Draught: 1.4 metres (off cushion);

0.5 metres (on cushion)

Displacement: 16 tonnes (full load)
Deadweight: 2.0 tonnes
Gross tonnage: 27
Net tonnage: 8
Main engines: 2 x Cummins QSB6.7 M, each 261 kW
Gearboxes: 2 x ZF 280
Propulsion: 2 x Alamarin-Jet AJ 340
Lift fan engine: Steyr SE196E35, 140kW
Maximum speed: 25 knots
Cruising speed: 20-25 knots
Range: 150nm
Electronics supplied by: Furuno
Radar: Furuno DRS 4 D
Radio: Furuno
Sonar/sounder: DFF1 Black box
Satcom: Furuno
Autopilot: Autopilot 711C
Compass: Olynoic 135
GMDSS: 1A equipment (Furuno)
GPS: Furuno Sc70
AIS: FA-50
Other equipment installed: ESNA SES control system
Paints/coatings: PPG
Liferafts: 2 x Viking 12DK+
Type of fuel: MGO
Fuel consumption: 150L/hour @ 100% power;

120L/hour at 85% power

Freshwater capacity: 50L
Crew: 2
Passengers: 9

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