DNV Certification Silt Basket Container Used in Offshore Operations

The weight of the silt should be considered during manufacturing, including the weight of the silt itself and the weight of the water contained in it. Marine silt usually has a high water content, which may reach 60% - 90%, which means that the container needs to have sufficient load-bearing capacity to withstand a large amount of heavy silt.At sea, it will be affected by various forces such as wind, waves, and tides. In bad weather, the impact of waves may cause the container to shake and tilt violently. Therefore, the structural design of the container must be able to resist these external forces to ensure stability during marine transportation and operation. Due to frequent lifting, transportation, and loading and unloading operations, the container will undergo repeated loading and unloading processes. This requires that the material and structure of the container have sufficient fatigue strength to avoid fatigue cracks and damage.

Seawater is a highly corrosive medium and contains a lot of salt. The container is prone to corrosion when it is in contact with seawater for a long time. Therefore, it is necessary to choose a material with good corrosion resistance. Weathering steel is a common choice. It forms a dense oxide film on the surface, which can effectively resist the corrosion of seawater. During the loading and unloading process of sludge, the bottom and side walls of the container will frequently rub against the solid particles in the sludge. In order to prevent the wear of the container, the material should have a certain wear resistance. Wear-resistant linings can be added to the easily worn parts inside the container, such as wear-resistant rubber linings or high-strength ceramic linings. These linings can not only reduce wear, but also prevent the sludge from sticking to the container wall to a certain extent.

The sludge container needs to have good sealing to prevent the sludge from leaking during transportation. At the same time, the welds of the side walls and the bottom should be welded tightly to ensure that there are no gaps.

The life of an anti-corrosion coating depends on a number of factors. In a mild offshore environment, with regular maintenance, a hot dip galvanized coating may last around 10-15 years, and a high quality marine specific anti-corrosion paint may last 5-10 years.

At the connection parts, such as the connection points between the lifting lugs and the frame, high-strength bolts or welding are used for reinforcement. The lifting lugs themselves are made of high-quality alloy steel and have sufficient strength to withstand the tension during lifting. At the same time, the design will take into account the stress distribution during the lifting process, optimize the shape and position of the lifting lugs, and make them transfer the tension as evenly as possible.