DNV Introduce Seismic Vessel Notation

Press Release
Wednesday, October 03, 2012

DNV has developed a class notation for seismic vessels in consultation with key industry players, WesternGeco, PGS and Fugro-Geoteam.

The need to have enhanced redundancy and proper deck arrangements to ensure continuous operation without loss of speed is the backbone of these new technical requirements.

Seismic vessels contain high end computerized technology to find resources below the seabed, and represent a key element in the value chain leading to future offshore field developments. Any interruptions in the ships forward movement can complicate the seismic data processing, and continuous operations with focus to avoid any downtime of key functions are hence of utmost importance.

With expensive seismic streamer equipment mobilized at sea, sudden loss of service speed may lead to severe consequences as damage to cables impairing the whole seismic vessel operation.

The new notation focuses on increased availability of the vessels during critical phases of the seismic operations. As well as vessel operators, DNV has consulted seismic handling and high pressure equipment suppliers to ensure that all current and future industry challenges are comprehensively dealt with.

The maintenance of propulsive power is a key issue. The class notation has therefore taken the DNV concept for redundant propulsion one step further so that any failure on board will not lead to loss of more than 50 per cent forward trust. This is sufficient to maintain a minimum speed of a few knots and will protect any high cost air guns and streamers deployed.

Seismic vessels typically operate for many months continuously without seeking harbour. The class notation requires a deck arrangement that facilitates side by side transfer for crew and resupply from a seismic support vessel.

Beyond this, the class notation also sets a requirement for the bridge arrangement to ensure good view to the streamers and any workboats that are close by during normal operation. High pressure systems are also addressed in the class notation to ensure that deck operations can be carried out safely by the crew.


 

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

Technology

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

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,

Offshore

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

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,

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.

Classification Societies

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

Rolls-Royce to Lead Autonomous Ship Research

Rolls-Royce announced it will take the lead on a €6.6 million project that could pave the way for autonomous ships. The Advanced Autonomous Waterborne Applications

NAPA Streamlines Compliance with Class Design Rules

NAPA Steel and NAPA Designer updated to reduce man-hours and duplication associated with new Common Structural Rules BC&OT   Global maritime software, services

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Standards Naval Architecture Offshore Oil Pipelines Salvage Ship Electronics Ship Repair Shipbuilding / Vessel Construction
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: 0.1240 sec (8 req/sec)