Container ships are among the leading modes of cargo transportation – technological and logistical advancements in the industry have now made it possible for container ships to carry more than 15,000 containers, with more than eight container stacks lashed together as a long series. Container lashing is therefore important in the process of securing cargo containers together on-board the cargo ship. However, this is also a risky process which requires great care and consideration during the process.
Container lashing is when the containers loaded over ships are secured to the ship’s structure and container below it with lashing equipment such as rods, turnbuckles or twist-locks. This process prevents shifting or movement of cargo containers from its position, and ensures that the containers do not fall into the water bodies during turbulent weather or wave conditions.
Lashing rods are arranged crosswise behind and in front of each container stack, which absorbs lateral movements of the container stack. Subject to container stack heights on deck and permitted weight, the lower layers are secured by rods at the bottom. To facilitate attachment of these rods, lashing bridges are to run across the ship between the container rows that allow workers to fasten rods.
Cargo lashing components must be in place to facilitate safe & efficient container lashing. Defective equipment is to be replaced at the earliest opportunity, in addition to ensuring that deformed hooks are not used. Moreover, it is dangerous to overlook steel wastage to secure devices that would reduce lashing strength. Lashings are to be well maintained, while lashing devices are to be maintained in good condition.
Lashing patterns are individually determined and calculated for each ship, inspected and approved by classification societies.
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