New Conept Under Test: Arctic Drillship

By Solange Van Derwerff
Monday, April 21, 2014
Solange Van Derwerff

When Ulstein Sea of Solutions (USOS) took part in a concept design competition for an arctic drillship, MARIN was asked to investigate the concept variations.
USOS was asked to participate in a concept design competition for a drillship  capable of operating in arctic conditions for several months a year. Special requirements are posed for the design of such a vessel due to the cold climate and the probability of encountering sea ice during operations.
Instead of making adjustments to a conventional drillship design, USOS developed a completely new concept dedicated specifically to the purpose of the vessel. Each aspect of the design was subject to a sensitivity study in order to assess the impact of particular parameters on the vessel design. Combining these design parameter sensitivities enabled MARIN to draw conclusions for the optimal ship design.
MARIN was involved in the design aspects related to the hull. The goal of the sensitivity study was to give qualitative insight into the station keeping performance of the vessel when considering various concepts. Each concept used a disconnectable turret and had dynamic positioning (DP) capability, but the position of the turret varied between the concepts. Evaluation of the mooring loads, the required thrust and the DP watch circle revealed the best turret positions for a range of environmental conditions.
Ice field in aNySIM
With the aNySIM tool, a time domain simulation was conducted whereby hundreds of particles represented a managed (pre-broken by icebreakers) ice field. A number of parameters were given to describe the severity of the ice conditions, including most importantly, the ice concentration (the fraction of the total area covered by ice) and the average ice floe (particle) size. An algorithm based on Voronoi Tessellation was used to obtain a set of ice particles that exactly complied with the specified parameter values.
All concepts were tested for their capabilities in the specific environmental conditions, evaluating four different vessel orientations with respect to the approaching ice field and for a blackout situation. Based on the results of these simulations, USOS could take an informed decision about the placement of the turret in the drillship. (USOS approved publication of their concept design test.)


The Author
Solange van der Werff is project manager at the Trials & Monitoring department of MARIN, the Maritime Research Institute Netherlands. 
e: s.v.d.werff@marin.nl 
w: www.marin.nl

(As published in the April 2014 edition of Maritime Reporter & Engineering News - http://magazines.marinelink.com/Magazines/MaritimeReporter)

Maritime Reporter June 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Environmental

MOL Commended with Quality Ship Awards

MOL Commended for ‘FY2013 Best Quality Ship Award’; MOL president Koichi Muto meets with captain and chief engineer, exchanging views and working to establish a more solid safe operation system.

Danos Adds Environmental Services

Danos recently added an Environmental Services Division to the company’s collection of oilfield related services, which includes production workforce, construction,

Danish Bunker Trader Joins GAC in London

GAC Bunker Fuels says it has appointed former GAC Denmark Shipping Assistant Ida Ryberg as a Bunker Trader with its UK team. Ryberg joins Andy Boichat and Resham

Naval Architecture

HydroComp to Hold Propeller 'Mini-Workshop'

A special version of HydroComp's intensive Propeller Workshops will be brought to Tampa before the start of IBEX 2014.   The Mini-Workshop is a special version

New Crewboat Design for Offshore O&G Market

Upgraded crewboat design employs carbon-reinforced composite materials and is lighter, faster and more fuel-efficient than alternatives. Marine Oil Transportation

GE, LR Study Gas Turbines for Commercial Ships

GE Marine and Lloyd’s Register Sign Memorandum of Understanding to Collaborate on Applying Gas Turbines to Power Commercial Ships GE Marine and Lloyd’s Register

Vessels

MOL Commended with Quality Ship Awards

MOL Commended for ‘FY2013 Best Quality Ship Award’; MOL president Koichi Muto meets with captain and chief engineer, exchanging views and working to establish a more solid safe operation system.

Farstad Offshore Vessel Squadron Chartered Out

Farstad Shipping ASA reports the following charter contracts, with a total value (including options) of approximately NOK 1.75-billion, as follows: Inpex has awarded

Better Operational News from Fugro

Fugro says that (an as yet unidentified vessel) recently affected by a fire is back in operation. The total time out of operation amounted to seven weeks. Secondly,

Arctic Operations

Study: An Arctic Oil Well Blowout Could Spread More Than 1,000km

Oil from a spill or oil well blowout in the Arctic waters of Canada's Beaufort Sea could easily become trapped in sea ice and potentially spread more than 1,000 kilometres to the west coast of Alaska,

House Subcommittee Hearing Highlights “Dismal State” of U.S. Icebreaking Capability

At the July 23, 2014, hearing of the House Subcommittee on Coast Guard and Maritime Transportation on “Implementing U.S. Policy in the Arctic” the committee chairman, Rep.

GTT Wins DSME Order for 9 More Icebreaking LNGCs

Gaztransport & Technigaz (GTT), a designer of membrane containment systems for the maritime transportation and storage of Liquefied Natural Gas (LNG), announced

Offshore Energy

Study: An Arctic Oil Well Blowout Could Spread More Than 1,000km

Oil from a spill or oil well blowout in the Arctic waters of Canada's Beaufort Sea could easily become trapped in sea ice and potentially spread more than 1,000 kilometres to the west coast of Alaska,

Westermeerwind Wind Farm Construction Begins

Mammoet announced today that Westermeerwind BV has reached financial close on July 25 for the turnkey construction of the Westermeerwind wind farm in Ijsselmeer,

Gas Prices Help Offset Statoil's Output Drop

Statoil's second quarter 2014 net operating income was NOK 32 billion, a decrease of NOK 2.3 billion compared to the second quarter of 2013. Adjusted earnings were NOK 32.

 
 
Maritime Contracts Maritime Security Naval Architecture Offshore Oil Pipelines Port Authority Ship Electronics Ship Simulators Shipbuilding / Vessel Construction Sonar
rss | archive | history | articles | privacy | terms and conditions | 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: 0.3099 sec (3 req/sec)