Anchor chains are an important part of marine engineering, mainly used to maintain the position of platforms, ships, etc. Anchor chains are made up of many chain links connected, can be made by welding, casting, and forging. Anchor chains are commonly made of steel, galvanized steel which is coated with a layer of zinc to against air corrosion. Here we will discuss their function and related knowledge in detail.

 What is the function of anchor chains?

1. Increase the anchorage traction

The mooring system is designed to control the ship position and movement, avoid the influences of sea conditions. When the wind or waves act on the ship, anchorage traction can make the mooring system more stable, avoid unexpected movement. Anchor chains stretched and deformed by tension, then dispersing the traction onto the whole chain. the position between the chain links can change the bending radius of chains, and increase the traction of the system.

2. Alleviate anchorage loads

Wind and waves also can bring instantaneous impact, such as “rogue waves” and storm surges. Anchor chains can relieve these destabilizing forces and distribute the load within the system. Due to some flexibility between chain links, they can reduce anchorage loads and protect the equipment by absorbing some of the loads.

3. Reduce system turbulence

Seawater movements may destabilize vessels and cause turbulence in the anchor chains and mooring systems. Anchor chains as part of the system, mitigate this turbulence and distribute it among the chain links. Because of the weight of anchor chains, the vessel also can move slower in wind and waves.

4. Protect the anchor

Anchor chains protect the anchor by sharing and dispersing the load. If the chain links missing or over strained, the anchor may not function normally or be damaged.

 How to choose the correct anchor chains?

Choosing the correct anchor chains for vessel is important for safe and effective mooring system. Several factors should be considered when selecting the chains:

Vessel size and weight: larger and heavier vessels require thicker and stronger anchor chains to provide more holding power.

Marine conditions: considering the environment, in saltwater or other corrosive conditions, stainless steel anchor chains are a better choice due to their superior corrosion resistance.

Chain size(diameter and length): the diameter of anchor chains should be appropriate for the vessel size and weight. And the chain length design should depend on the water depth. Select the appropriate diameter and length of anchor chains can ensure anchor chains withstand the loads and avoid accidents during operation.

Chain Grade: link chain divided according to strength level, G100, G80, G70, G50, etc. The strength levels determine the load bearing and service life of anchor chains.

Budget: consider your budget, stainless steel anchor chains are more expensive than galvanized steel chains. While stainless steel offers superior corrosion resistance, galvanized chains can be a cost-effective choice if you are on a tighter budget.

SHINING recommendations: it is crucial to strike a balance between cost, performance and safety when selecting chains. Consulting with engineers or marine experts can be valuable in making an informed choice.

Chain maintenance:

Because anchor chains are often affected by seawater and oxidation, they should be inspected and maintained regularly.