Home PageServicesClientsNewsContact Us

Friday, 23 September 2011

Vestdavit to supply extra-long outreach seismic multipurpose davits

Norway-based boat handling system and specialised davit supplier Vestdavit has been contracted by Mitsubishi Heavy Industry on behalf of Petroleum Geo-Services (PGS) to design and supply extra-long outreach workboat/lifeboat/FRC davits for PGS’s 5th generation Ramform new building seismic vessels.

The two davits for each of the two vessels building at Mitsubishi Heavy Industry, Japan for 2013 delivery will have an extra-long outswing to be capable of launching and recovering 20 man tender boats safely in seas states 5 – 6.

Vestdavit has designed a special Vestdavit H – 10000S dual point hydraulic davit with a dual winch system for the application.

Atle Kalve, development manager, Vestdavit, says, “These davits will make deployment and retrieval safer for PGS’ crews. The tender boats will normally be used in relatively calm sea states, but are constructed to handle safely even in sea state 6, and these davits will recover them safely in those seas.”

The boats and davits also have the function as lifeboats and Fast Rescue Craft in an emergency.

A key benefit of these davits is the simplicity of use, which reduces crew training needs. They are also extremely robust and will work a long time on station without servicing.

The characteristic Ramform design seismic survey vessel has only a short flat parallel ship side for the boat to lie against. To overcome this Vestdavit will supply a painter boom travelling 12 metres, the longest ever supplied by Vestdavit. Both boom and davits are computer controlled with inbuilt auto tension and shock absorption to allow the boat to launch and recover safely in high seas.

Kalve says, “These boats will be used daily at sea for personnel and crew changes and supply between the support vessel and the seismic vessel which will continue working. The seismic work boats which would normally be used for this sort of application do not have the capacity for 20 men. The combination boat on the Vestdavit davits can work as a Fast Rescue Craft with six crew, as a tender with 20 persons on board and as a lifeboat with a 40 person capacity.

Our dual point system is designed to fulfil all the different functions needed for this multi operation davit. The davit design delivers launch and recovery that will be both safe and quick in high sea states, which means less risk for the crew and more operational uptime for both the seismic vessel and the support craft.”

Vestdavit is also to design and supply a special shock absorber system for the paravane heavy load lines. It will handle peak loads up to 200 tonnes per shock absorber, again helping to keep the vessel at work despite heavy seas.

For a graphic of the Vestdavit multipurpose system see attachments, go to http://bit.ly/roQ3Hu or e mail john@merlinco.com

Vestdavit designs, supplies and supports tailor-made solutions for launching and recovering boats in difficult conditions at sea. Its range of boat handling systems and davits are the first choice of navies, coastguards, seismic survey operators, pilot authorities and offshore operators who need to be able to operate small boats safely from larger vessels. Since 1975 Bergen-based Vestdavit has supplied over 1,800 davits and side and stern launch systems. They have proven themselves over more than 30 years use in the North Sea and other harsh environments around the world. Self-tensioning and shock absorbing systems ensure crew safety and widen the operational window for the users. Vestdavit’s key focus is on operational effectiveness, safety and the reliability of its equipment. http://www.vestdavit.no/

For more information:

Atle Kalve
Vestdavit
+ 47 45 21 97 31
atle.kalve@vestdavit.no

Labels: , , ,

Tuesday, 19 July 2011

OSD to design seismic support/chase vessel series for Bourbon

Offshore Ship Designers has been chosen to design a series of six new fuel-efficient seismic support/chase vessels ordered by French offshore major Bourbon to be built at Dubai’s Grandweld Shipyards. The 53 m vessels will have a fuel efficient hybrid propulsion system delivering a flexible economic solution for the varied conditions required to support seismic survey vessels including transit speed, slow speed escort and support work and a high degree of manoeuvrability.

Neil Patterson, managing director of OSD-IMT, the UK arm of Offshore Ship Designers says, “We worked closely with Grandweld during the tender period and following their selection as one of the short-listed bidders, we assisted them technically during the successful contract negotiation process, and are pleased to have been entrusted with the design of these new vessels.”

The vessels will be chartered by Bourbon to CGGVeritas with delivery of the first vessels set for the end of 2012. They will be used to support the fleet of CGGVeritas seismic survey vessels operating all over the world, providing them with services including crew change, fuel delivery, storage, assistance and support during at-sea maintenance operations.

Operational requirements of the design include:

• Cargo runs from port to the mother ship
• Transfer of fuel, potable water, dry and refrigerated stores and general cargo to the mother ship.
• Transfer of crew to and from the mother ship.
• Accompanying the mother ship when conducting seismic operations
• Towing of the mother ship when conducting seismic operations
• Retrieval of streamer cables

Key feature of the hybrid propulsion system are:

• Two main marine diesel propulsion engines, two controllable pitch propellers in nozzles, two main gearboxes each with a PTI electric propulsion motor and three diesel driven generating sets, and two electrically driven bow tunnel thrusters.
• Diesel-mechanical mode using main engines only used for the transit operation.
• Diesel-electrical mode with main engines declutched using PTI propulsion motors powered by the gensets for chase and slow speed operation.
• Boost mode with main engines and PTI propulsion motors (powered by the gensets) engaged used for towing operation.
• Automatic push button selection between the different propulsion modes.

Service speed in transit mode with only main engines in operation – 11.0 knots
Service speed in diesel-electric mode without main engines – up to 6.0 knots
Service speed in boost mode with main engines and PTI motors – 11.3 knots
Bollard pull in boost mode with main engines and PTI motors – 50 tonnes

Main particulars are length 53.8 m, beam 13.0 m, depth 5.8 m, load draft 4.8 m, cargo fuel capacity 850 cu m, marine gas oil fuel 260 cu m, potable water 100cu m, refrigerated and dry storage capability as well as space on deck for stowage of stores containers.

Offshore Ship Designers Group (OSD) is a global one-stop resource delivering naval architecture and marine engineering skills to the shipping and offshore energy industries. It draws on an experienced global workforce to provide high quality feasibility studies, conceptual and detailed designs for tugs and offshore support vessels of all types. OSD is based in IJmuiden, The Netherlands, and has offices in Montrose, York, Appledore, Shanghai and Singapore. www.offshoreshipdesigners.com

For a PDF graphic of the IMT 952 concept: brusselers@offshoreshipdesigners.com


Or click this link to find downloadable photos:

http://bit.ly/p0ZbFX



For more information:

Merijn Brusselers
Offshore Ship Designers
+31 (0)255 54 50 70
brusselers@offshoreshipdesigners.com

Labels: , , , ,


Search all news items





Home | Services | Clients | News | Contact
Copyright © Merlin Corporate Communications.