Rolls-Royce Subsea Construction Vessel Delivered to Island Offshore

MarineLink.com
Monday, June 03, 2013
Island Crown (Photo: Rolls-Royce)

Island Crown is the latest vessel to come from the relationship between Island Offshore and Rolls-Royce. Once again the UT 776 CD has been selected as the basis for a vessel to meet some special offshore requirements. Over the past few years, the Norwegian shipowner has added several batches of the UT 776 platform supply vessel to its fleet, including two fuelled with LNG.

This time around, the design brief was a vessel that will usually spend its time connected to an offshore platform, acting as a hotel for people working on the platform. Island Crown can also carry out a separate set of functions – subsea construction and ROV operation – and is additionally equipped to transport all the liquid and bulk supplies needed by rigs and platforms.

It was logical to choose the latest and longest version (99.8m) of the Rolls-Royce UT 776 CD which has proven low motion in a seaway. Also specified were other Rolls-Royce ship systems similar to these on other Island Offshore vessels, such as a four-generator set diesel electric propulsion system, Azipull main thrusters and twin tunnel thrusters with a swing up azimuth thruster at the bow. This arrangement provides the high level of redundancy required for the DP2 class Dynamic Positioning System.

STX Offshore, now the Vard Brevik shipyard, was chosen to build the vessel. Island Crown has the UT 776 CD superstructure layout favoured by Island Offshore. This provides comfortable accommodation for a marine crew of about 40 including supernumeraries. The hotel block is placed aft of the main superstructure, with a hospital and services at main deck level and two decks of 2-person cabins, day and meeting rooms above. The main galley supplies the food, and there are also pantries in the hotel section.

Platform workers living on the ship have to transfer between ship and platform at the change of shift. To do this, they use a transfer gangway positioned at the port aft corner of the deck. Island Crown is flexible enough to link to many different types of platform, with a variety of heights above water level of the platform entry port. To cater for these variations, and also the relative motion between vessel and platform in a seaway, the access system is made up of two main components: one is a telescopic tower and staircase which takes care of the initial height differences; the other is the gangway itself, linking the top of the tower and the docking point at the entry port. The gangway is hydraulically positioned but free to pivot, allowing for relative motion. Its length can also be varied. Normally, the vessel will maintain a fixed distance from the platform under DP, at a heading that as far as possible minimizes the energy required by the thrusters to keep station. Uptime supplied the gangway and Ulmatec provided the telescopic tower.

Passengers transfer first up a gangway from the main deck to the tower staircase, then up to the transfer gangway. If the system has to match a very low platform height, the tower telescopes down and the deck gangway then leads downwards to a mezzanine deck at the foot of the staircase.

Passengers and crew can be transported to and from land by helicopter. The helicopter platform is above the hotel near the point of minimum ship motions with access to the reception area.

Island Crown is designed to the very demanding SPS (special purpose ship) rules which, among other things, set strict limits on stability and angle of heel under various collision or damage scenarios. With a hundred people on board, there needs to be extensive evacuation capability, in this case two enclosed lifeboats and two Man Over Board boats.

For its platform service and subsea construction roles, Island Crown is equipped with a long boom crane mounted on the starboard side with capacity ranges from 10t at 40m to 100t at 10m. Also on this side is the ROV handling area with cursor just aft of the hotel block. Other subsea operations can be carried out from the port side.

Island Offshore’s new vessel is built and equipped to a very high standard, and provides offshore operators with a ship of good pedigree and capable of efficiently fulfilling several distinct roles.

www.Rolls-Royce.com

 

Maritime Reporter July 2015 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Marine Propulsion

GE Gas Turbines to Power US Navy’s New Destroyers

The U.S. Navy’s new DDG 121 and DDG 122 Arleigh Burke-class destroyers will be powered by eight LM2500 marine gas turbines supplied by GE Marine, who also received

First Vessel of New Rescue Class Launched

Global shipping and energy services firm, Craig Group, has launched its first F-Class vessel, the Grampian Fortress. The IMT 958 multi-role emergency response and

Tanker Retrofitted with Dual Fuel Engine

Caterpillar Marine informs it has begin a dual fuel engine retrofit conversion onboard the 472-foot Fure West tanker, owned by Furetank Rederi A/B. The MaK M 43

Offshore

CWind Joins National Workboat Association

Citing crew transfer services as an integral part of its offering, offshore wind industry service provider CWind announced it is now a member of the National Workboat Association (NWA) of the U.

BG Group Starts up Sixth FPSO in the Santos Basin

BG Group announced first oil from the Cidade de Itaguaí floating, production, storage and offloading (FPSO) vessel, the sixth unit to start production across the

BG Awards Fugro MBES, Seabed Coring Contract

Fugro has been awarded a contract by BG International Limited Sucursal Honduras to conduct an integrated multibeam echosounder (MBES) survey and seabed coring campaign

Vessels

SKANReg Recruits UK Ship Register's Mazumdar as CEO

After four groundbreaking years as head of the UK Ship Register (UKSR), Debasis Mazumdar is moving on to become CEO of the London-headquartered St Kitts & Nevis International Ship Registry (SKANReg),

LNG Ferry Construction for Tallink Begins

The start of production of Tallink's new generation LNG powered fast ferry for the Tallinn-Helsinki route was celebrated on the 4th of August 2015 at Meyer Turku shipyard.

NYK Hosts Safety Conference

Over three dates in July, NYK hosted a safety promotion conference for shipowners and ship-management companies at the NYK head office in Tokyo and at Imabari city in Ehime prefecture.

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Navigation Offshore Oil Pod Propulsion Salvage Ship Simulators Shipbuilding / Vessel Construction Sonar Winch
rss | archive | history | articles | privacy | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1466 sec (7 req/sec)