Among the root causes of many stranding and collision accidents, the loss of anchor is one of the reasons for the five major claims. With the growing number of lost anchors reported in recent years, DNV GL, Gard and The Swedish Club have been asked to explore this issue. Based on an analysis of damage incidents involving the loss of anchors and anchor chains, the project's partners issued an introduction to identify the most common technical and operational reasons, as well as measures that crews and operators can take to avoid these accidents.
“One of the key points of our research is that drivers and crews are aware of the importance of the environmental considerations in designing anchoring equipment,†DNV GL Senior Engineer H? Kon skaret said, "If these restrictions are not considered in the ship's throw-off anchor program, it may cause serious damage to the ship, even beyond the loss of the anchor and chain. If the anchor equipment is properly maintained and the correct throw is taken Anchoring procedures, many anchors can be avoided."
Checking for losses from technical or operational errors reveals some key issues. In terms of technology, the D-type shackle is the technical component that causes the highest loss rate of loss. Therefore, it is necessary to check as much as possible, paying particular attention to the tapered pin. Fastening the anchor in the anchor chain during navigation helps to avoid excessive vibration causing the tapered pin to loosen. The brake belt of the windlass is critical to controlling the speed at which the anchor chain is released. Many anchorage reports have been shown to be caused by failure to control the anchor chain. Corrosion of the anchor chain reel and wear of the brake band reduce its braking capacity, so it is necessary to adjust the brake tension and brake band replacement according to the manufacturer's instructions.
“Operation, every mooring operation is not the same†H? Kon skaret said, “In practice, especially in bad weather, crews and drivers need to pay attention to risks and conduct thorough evaluation. We found that in almost half of the cases, environmental risk factors such as weather, current and water depth It is an important cause of loss. In order to help ship personnel in this regard, shipping companies should ensure that safe anchoring procedures are carefully implemented in the company's safety management system."
The loss of anchors and chains often leads to ship collisions and stranding accidents, which ultimately cause other damage to the ship. The increasing popularity of port authorities to retrieve lost anchors has also increased the cost of lost anchors.
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