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

Environmental

Research Vessel Heincke: Serving Science for 25 years

7 July 2015. A quarter of a century old, with over 900,000 kilometres (488,842 nautical miles) logged and still on the cutting edge of science and technology:

Water Conservation Measures at Panama Canal

The water levels at Gatun and Madden Lakes are currently well below the expected levels for this time of year. Based on a comprehensive analysis of historic data,

Aberdeen Pupils Peek into Subsea Oil & Gas Technology

Pupils at an Aberdeen primary school were given a rare insight into the depths of the oil and gas industry’s subsea sector after getting to sit in the driving

Naval Architecture

AVEVA, DNV GL's Sesam Integration Cuts Cost

Integration of Aveva and DNV GL's Sesam Reduces Costs in Maritime and Offshore Engineering. Engineers designing ship hulls and offshore floaters can now save

FORAN for Pertamina's Future Ships

FORAN has been chosen by state-owned company PERTAMINA to review the design of their future oil product carrier ships, under construction in a shipyard with the FORAN System.

Technip Samsung JV Wins 2 FLNG Project Contracts

The Browse project covers the realization and installation of three FLNG units to develop the Brecknock, Calliance and Torosa fields in the Browse Basin, 425 kilometers North of Broome,

Vessels

Asia-N Europe Container Freight Rates Jumps 60%

Shipping freight rates for transporting containers from ports in Asia to Northern Europe rose by 60.4 percent to $879 per 20-foot container (TEU) in the week ended on Friday,

G6 Alliance Extends Asia – North America Service

In response to market demand, members of the G6 Alliance today announced the below enhancement to improve the Asia – North America (East Coast) trade. NYK will

Stena RoRo Charters Three Vessels

Stena RoRo has reached an agreement with the Finnish shipping company Godby Shipping to long-term charter their three RoRo vessels Misida, Misana and Miranda.

Arctic Operations

First Subsea Wet Gas Compressor Installed

After several years of technology development, construction and testing the first subsea wet gas compressor in the world is now installed at the Gullfaks C platform in the North Sea.

U.S. Draft Recovery Plan for Threatened Polar Bears

U.S. wildlife managers released on Thursday a draft plan for stemming the decline of polar bears threatened by melting Arctic sea ice linked to global warming,

UK Navy’s Ice Patrol Ship Gets a New Coating

U.K. Royal Navy Ice Patrol Ship HMS Protector is deployed on operations for 330 days a year, mostly in the Antarctic region, making it essential that her underwater

Offshore Energy

Indonesia Expects Total to Decide on Mahakam within days

French oil firm Total  will decide how much interest it will retain from 2018 in Indonesia's offshore Mahakam oil and gas block over the next two days, the

First Subsea Wet Gas Compressor Installed

After several years of technology development, construction and testing the first subsea wet gas compressor in the world is now installed at the Gullfaks C platform in the North Sea.

Drydocks World Completes World’s Largest Turret

Drydocks World the leading provider of maritime and offshore services to the shipping, oil, gas and energy sectors marked a major milestone in successfully completing

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Standards Offshore Oil Pipelines Pod Propulsion Salvage Ship Repair Shipbuilding / Vessel Construction Sonar
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: 0.4076 sec (2 req/sec)