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Displaying items by tag: Wind Turbine Installation Vessels

#POWER FROM THE SEA - This morning the wind farm turbine installation vessel Sea Energy, departed Wicklow Bay having spent over a fortnight based in Wicklow Port, where her Danish crew celebrated Christmas Day, writes Jehan Ashmore.

The Esbjerg registered vessel operated by A2 Sea, arrived in the week before Christmas to work at Airtricity's Arklow Bank Wind Farm, but the nature of the work was based on internal operations only at the seven turbine facility, which each structure scaling to a height of over 70 metres / 240 feet.

Upon completion of her work, she returned to Wicklow where her crew spent the festive season in port with a Christmas tree complete with  lights! at the bow.

She remained in the harbour into the New Year and during the recent spate of heavy weather until finally departing yesterday on Little Christmas, where she overnighted in the bay.

With four towering supporting jack-up legs each 32 metres  high, this enables her to carry out offshore crane operations with greater control. In addition the vessel is raised completely above the water to gain elevation to assist mounting the pre-assembled wind-turbine components from her deck cargo.

She can work in waters of up to 24 metres and as she rests on the sea-bed this provides a more stable working platform.

Sea Energy presented a distinctive profile while in port as she 'sat' close to the Packet Quay, as her jack-up legs make mooring ropes redundant.

The quay is the main commercial quay and during this week she vacated the berth to allow regular caller Scot Isles (2001/2,595grt) which arrived with a cargo of sawn packaged timber products from Scandinavia. Owned by Scot Line, the vessel remained in the port for two days and then departed for Warrenpoint.

The Wicklow Port Company also specialise in dry-cargoes, lead, and scrap-metal as previously reported, to read more click HERE.

It is somewhat unusual for vessel movements in Wicklow to berth outside the harbour piers, as in the case with Sea Energy.

She shifted berths to the seaward side of the West Pier and again she sat with jack-legs lowered in water depths of six metres, leaving a clearance of around two metres below the keel.

Although Arklow is closer to the wind-farm than Wicklow, Sea Energy's 3,332 gross tonnes is too large to be accommodated as the port on the River Avoca has a has lower water depth.

Published in Power From the Sea

The Half Ton Class was created by the Offshore Racing Council for boats within the racing band not exceeding 22'-0". The ORC decided that the rule should "....permit the development of seaworthy offshore racing yachts...The Council will endeavour to protect the majority of the existing IOR fleet from rapid obsolescence caused by ....developments which produce increased performance without corresponding changes in ratings..."

When first introduced the IOR rule was perfectly adequate for rating boats in existence at that time. However yacht designers naturally examined the rule to seize upon any advantage they could find, the most noticeable of which has been a reduction in displacement and a return to fractional rigs.

After 1993, when the IOR Mk.III rule reached it termination due to lack of people building new boats, the rule was replaced by the CHS (Channel) Handicap system which in turn developed into the IRC system now used.

The IRC handicap system operates by a secret formula which tries to develop boats which are 'Cruising type' of relatively heavy boats with good internal accommodation. It tends to penalise boats with excessive stability or excessive sail area.

Competitions

The most significant events for the Half Ton Class has been the annual Half Ton Cup which was sailed under the IOR rules until 1993. More recently this has been replaced with the Half Ton Classics Cup. The venue of the event moved from continent to continent with over-representation on French or British ports. In later years the event is held biennially. Initially, it was proposed to hold events in Ireland, Britain and France by rotation. However, it was the Belgians who took the ball and ran with it. The Class is now managed from Belgium. 

At A Glance – Half Ton Classics Cup Winners

  • 2017 – Kinsale – Swuzzlebubble – Phil Plumtree – Farr 1977
  • 2016 – Falmouth – Swuzzlebubble – Greg Peck – Farr 1977
  • 2015 – Nieuwport – Checkmate XV – David Cullen – Humphreys 1985
  • 2014 – St Quay Portrieux – Swuzzlebubble – Peter Morton – Farr 1977
  • 2013 – Boulogne – Checkmate XV – Nigel Biggs – Humphreys 1985
  • 2011 – Cowes – Chimp – Michael Kershaw – Berret 1978
  • 2009 – Nieuwpoort – Général Tapioca – Philippe Pilate – Berret 1978
  • 2007 – Dun Laoghaire – Henri-Lloyd Harmony – Nigel Biggs – Humphreys 1980~
  • 2005 – Dinard – Gingko – Patrick Lobrichon – Mauric 1968
  • 2003 – Nieuwpoort – Général Tapioca – Philippe Pilate – Berret 1978

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