DNV stands for Det Norske Veritas, an independent and self-governing foundation dedicated to the protection of human life, the property and the environment both onshore and offshore. DNV Shipping Containers or Offshore Containers are certified containers for the oil and gas industry. This portable unit can be used many times, thus increasing its worth and viability.
When transporting large components to a drilling rig or FPSO (or storing products on site), you require containers that can endure harsh weather and movement. Due to certain hazards that may exist in the oil industry, DNV containers must comply with safety regulations in order to be certified for application on oil rigs, on oil tankers and in the environment.
DNV Shipping containers are divided into three main types:
Offshore freight containers：Suitable for carrying large loads and cargoes.
When transporting large components to a drilling rig or FPSO (or storing products on site), you require containers that can endure harsh weather and movement. Due to certain hazards that may exist in the oil industry, DNV containers must comply with safety regulations in order to be certified for application on oil rigs, on oil tankers and in the environment.
DNV Shipping containers are divided into three main types:
Offshore freight containers：Suitable for carrying large loads and cargoes.
Offshore service containers：Can be customized to specific projects such as control centers, laboratories, power plants or workshops.
Offshore waste skip containers: Suitable for holding rubbish with an open or closed top.
Due to the harsh environment at sea and the frequent lifting of offshore containers, there are strict requirements on the lifting lugs of offshore containers.
- The design of lifting lugs should not exceed the limit formed by the outer surface of the frame, except the limit of the top.
- Lifting lugs are to be reasonably designed so that the slings connected to them are not entangled with containers or cargo.
- The design of the lugs is to allow free movement of the shackles and slings without damaging the lugs.
- In order to avoid lateral bending moment, in the hoisting state, the eye plate of the lifting lug should be coplanar with the vertical plane where the corresponding limb cable is located, and the maximum manufacturing tolerance is ±2.5.
- When there are four lifting lugs, the relative positions between the lifting lugs should be arranged as a rectangle. The length difference between the two diagonals of the rectangle shall not exceed 0.2% of the nominal diagonal length or 5 mm, whichever is greater.
- The design of lifting lugs should be matched with shackles, and one kind of lifting lugs should not be matched with shackles of various specifications. The clearance between the shackle pin and the lug hole should not exceed 6% of the diameter of the shackle pin.
- The thickness of the lug hole shall not be less than 75% of the width of the shackle body.
- If the lifting force is transmitted through the thickness direction (Z direction) of the plate, the plate used should have the corresponding mechanical properties in the Z direction. When plates with a thickness less than 15mm are used, an engineering justification for the material used shall be based on mechanical testing, ultrasonic testing, or review of chemical and mechanical properties.
- Lifting lugs are to be connected to the frame by full penetration welding. It is recommended that the lifting lugs be connected to the main structural frame beams by inserting the lifting lugs into the slots of the main structural beams.
DET NORSKE VERITAS (DNV) is an autonomous and independent foundation whose goal is to protect life, property, and the environment at sea and on land. DNV undertakes classification, certification and other verification and consulting services related to the quality of ships, offshore equipment and facilities, and onshore industries worldwide, and conducts research related to these functions.
The DNV 2.7-1 certified offshore container is specifically designed for dynamic hoisting with eye pad devices and DNV certified slings fitted with shackles.
They are checked during the design phase, material procurement, production, and final loading and NDE testing. Not only are prototypes tested, but a specific number of units are randomly selected from each batch for testing at a rate five times the rate of ISO standard container testing.
The containers have a solid steel structure, including floors. They weigh almost twice as much as an ISO container of the same size, which is critical to their ability to maintain an upright position while being transported in rough seas. They must be equipped with DNV approved slings, stronger steel, stricter production specifications and have all the test documentation to prove their reliability in harsh offshore conditions.
Classification societies certify containers
The DNV 2.7-1 certified offshore container is specifically designed for dynamic hoisting with eye pad devices and DNV certified slings fitted with shackles.
They are checked during the design phase, material procurement, production, and final loading and NDE testing. Not only are prototypes tested, but a specific number of units are randomly selected from each batch for testing at a rate five times the rate of ISO standard container testing.
The containers have a solid steel structure, including floors. They weigh almost twice as much as an ISO container of the same size, which is critical to their ability to maintain an upright position while being transported in rough seas. They must be equipped with DNV approved slings, stronger steel, stricter production specifications and have all the test documentation to prove their reliability in harsh offshore conditions.
Classification societies certify containers
- 1. Design evaluation: details of materials, cargo handling, container lifting and cargo tightening inside the cantainer.
- 2. Manufacturing process: certified inspectors authenticate and test raw materials to confirm that welder qualification, welding process and non-destructive carbon damage work meet the requirements
- 3. Test: Four-point lift, two-point lift, tilt test and drop test
