DNV is the leading Classification Society for the classification of Ships, Rigs, and Offshore Platforms.

DNV comprises over 5,500 employees in 300 offices in over 100 different countries worldwide. DNV 2.7-1 was first published in 1989, with a second edition in 1995, and the current 2006 version. The current BS EN 12079 (1999) is based on DNV 2.7-1 (1989). Since 1989, DNV has certified nearly 40,000 containers worldwide. DNV provides technical support, design review, surveys and the relevant certificates necessary for the certification of offshore containers.

Definition of an "Offshore Container"
"Portable unit with a maximum gross mass of 25,000kgs (55,000lbs) for repeated use in the transport of goods or equipment, as handled in open seas to/from or between fixed and/or floating installations and ships".

Design Review (Case Approval)
For design review the following documentation should be submitted:

• Drawings
• Dimensions
• Materials
• Weld details
• Weights
• Sling angle
• Calculations

Case Approval is job specific for a known batch and only valid for that batch. If the intention is to manufacture several over a period of time Type Approval should be requested. This would be valid for 4 years, and can be renewed for longer if required.

Materials
The design temperature of the container must be a minimum of -20°C; therefore, the materials chosen should be suitable for this temperature range, have the required ductility, be fully killed, and have nonageing properties.

Fabrication Surveys
DNV has defined inspection points and competent, trained Surveyors with extensive experience in the certification of Offshore Containers.

Welding Procedures, Welder Qualification
Welding Procedures and Welder Qualifications must meet the following recognized standards for DNV approval:

• ASME IX
• AWS D1.1
• BS EN 287 pt 1
• BS EN 288 pt 3

N.B. All procedures are required to have Charpy Impact tests at WCL, FL, FL+2 ^& FL+5.

As part of Gauthiers’ commitment to service, DNV reviews weld procedures prior to commencement of work and provides an approved table. This has been found to improve time management, give fabricators more confidence, and reduce paperwork.