DNV Develops New Class Notation for Seismic Vessels

DNV Develops New Class Notation for Seismic Vessels

DNV has developed a new class notation for seismic vessels in consultation with key industry players such as 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 new notation was released this summer and strengthens DNV’s position in the seismic classification market as the industry focuses more strongly on deepwater, frontier exploration. “DNV has the greatest share of this market. More than every second seismic vessel is DNV classed. By introducing the new class notation we are helping owners in this high-tech special vessel segment to meet future demands with the outmost safety and reliability,” says Jan Kvålsvold, Director for Market and Business Development.

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.

“The world’s energy demand is increasing,” said Mr Kvålsvold. “Even though new energy sources are being developed, fossil fuel will maintain dominance well into the future. The demand for suitable seismic exploration vessels is already high and will continue to grow.”

Press Release, October 03, 2012

Share this article

Follow Subsea World News

Events>

<< Feb 2016 >>
MTWTFSS
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29 1 2 3 4 5 6

Oceanology International 2016

Oceanology International is held in London every two years. In its 46th edition, it has firmly established itself as the world leading marine…

read more >

The 16th North Sea Decommissioning Conference

The 2016-programme has been composed to shed light on the effect of the current low oil-price environment on the decommissioning market…

read more >

Substructures for UK Offshore Wind

Design, construction and installation

Optimising offshore substructures is one of the key challenges for reducing LCOE. Foundation designers have produced a variety of different solutions: monopiles, GBS, jackets, suction buckets and floating foundations. Looking at U.K. projects – different soils, water depths,fabrication timelines and installation challengescreate many questions for the industry to solve. We’re entering uncharted territory; projects arelarger, farther and more complex than ever completed.

Now is the time to have a close look at lessons learnt and define the room for improvement for the U.K. wind industry.

More Info

read more >

AOG 2016

AOG is well established as the premier networking forum for oil and gas industry professionals to meet face-to-face with decision-making…

read more >