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Shandong Lisheng Machinery Co., Ltd. is a new generation enterprise dedicated to the hardware industry. It is located in Jining City, Shandong Province, the hometown of Confucius and Mencius. The company is a professional hardware supporting enterprise integrating design, research and development, production and sales. The main products are chains, wire ropes and their accessories: shackles, turn buckles, clips, rings, snap hooks and other forgings and castings, and accept drawings and samples for processing.
The Mechanics of an Anchor Chain
Understanding the mechanics of an anchor chain is key to appreciating its role in anchoring operations. When the anchor is dropped, the chain pays out, allowing the anchor to settle on the seabed. As the ship moves backward, the chain gradually extends, forming a catenary - a horizontal curve shaped by the weight and tension of the chain. The catenary acts as a shock absorber, distributing the forces exerted on the anchor and reducing strain on both the anchor and the vessel.
Anchor Chain Stowage Arrangement
It is evident that the anchor chain plays a vital role in conjunction with the anchor. However, since modern anchors are made from metal or from a rope, they stand a high chance of wear and tear related issues, such as rusting or chaffing.
The solution is to constantly monitor the anchor rode whenever it is hauled back on to the vessel.
For this, special stowage arrangements have to be made such that the rode is kept safely away from corrosive substances and so that it can be easily accessed for either maintenance or to paid out with the anchor.
Anchor chain storage locker
Anchor chains are stored in a chain locker set deep within the hull of the vessel. These are ventilated enclosures that are used to store the anchor while it is not in use, and to house the remaining length of the anchor chain while it is deployed. It can be accessed by engineers and personnel for routine checks or long-term maintenance.
Generally, the floor of the chain locker is reinforced, so that it can bear the extra weight of the metal rode. To haul the chain out of the locker, a series of heavy-duty motors and gears are set up on the deck in pairs.
The structural properties of the anchor chain
The anchor chain consists of many chain links, and the size is expressed in chain diameter (mm). According to whether there is a strut in the middle of the chain ring, it is divided into nailed anchor chain and nailless anchor chain. Anchor chains can be made by forging, casting and welding.
The marine anchor chain is composed of several "sections" (shackles), each section is 25.0-27.5 meters long, and the sections are connected by chain links or shackles. After the anchor is lifted, the chain is stored in the chain locker in the bow. The specifications of the anchor chain are determined according to the ship construction standard.
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The anchoring equipment of a ship comprises the anchor, anchor chain and the windlass. The anchoring equipment as required herewith is intended for temporary mooring of a ship within a harbour or sheltered area when the ship is awaiting berth, tide etc.
Determining how long your anchor rode should be is as simple as multiplying the deepest water you expect to anchor in by 8. As for rope size, the rule of thumb is 1/8" of rope diameter for every 9' of boat length.
Its primary purpose is to provide a mechanism for ships and boats to hold their position either during berthing and mooring operations at ports, or for large offshore installations such as semi-submersible oil rigs to remain stationary above an oil deposit.