Anchoring is an important marine operation that helps a ship or vessel remain stationary at one point. When anchored, ships don’t drift away despite carrying thousands of tons of cargo. This technique is used when a ship is away from the dock and needs to remain stationary. Effective ship anchoring is a crucial marine operation in the maritime industry.
Anchoring is a highly used process keeping the ship or vessel safe in the water. However, if anchoring fails, the ship can drift away in harsh winds or bad weather. If the weather is harsh, this drift can even lead to accidents, as ships may collide with one another. In this article, I will discuss everything about anchoring and how you can use it to make the ship stable. Let’s get started.
What is Ship Anchoring?
Before discussing effective tips, I will help you understand the basics of anchoring a ship.
Anchoring is the process of keeping stable and stationary at one location by dropping an anchor. This anchor goes into the seabed and digs in. This way, it keeps the ship stable and prevents it from drifting away. This anchor relies on its anchor chains, which keep it connected to the ship and prevent it from drifting.
As you know, ships and vessels stay in the water body for days without reaching docks, right? During their journey, these ships also face harsh storms, winds, and waves. These waves can make the ship unstable and cause it to drift away. That’s where the anchoring comes in handy. The ship or vessel drops anchor in the sea.
This anchor is a metal block that digs into the seabed and holds it. This way, the anchor stops the ship and prevents it from drifting or moving away. Sometimes ships also anchor near the dock or port, especially when there is more traffic at the port. The captain uses an anchor to keep the ship stationary. This helps prevent accidents caused by collisions between ships.
During anchoring, different components are used. These include:
- 앵커
- Anchor chains
- Hawse pipe & windlass
- Chain locker & stopper
- Anchor Shackle & Swivel
Remember, anchor chains are so strong that they withstand harsh forces when a ship tries to drift. However, the anchor’s weight and digging capability do not allow ships to move away. Remember, there are different types of anchors used in anchoring operations. Some of these include stockless, fluke, and plow anchors, among others. The plow anchor is more powerful because it offers excellent holding capability even on unstable seabeds.
Practical Step: Effective Ship Anchoring Process
As I said above, small mistakes can lead to disastrous ship accidents. Why? Imagine the anchoring of a ship fails for any reason. As a result, the ship will continue drifting and moving without any control. This ship will be uncontrolled and will collide with nearby ships or other structures. As a result, there will be serious damage to the ships.
That’s where effective ship anchoring is very important. In the section below, I will discuss steps that will help you correct ship anchoring.
1- Correct Anchoring Site or Location
Before starting the anchoring process, you should first analyze the site or location. As you know, there are different types of seabed. Some seabed rocks consist of stone. Such seabeds are hard and do not allow the anchor to grip or dig in. As a result, the anchor keeps dragging when the ship or vessel is exposed to harsh winds or waves.
Instead of being stationary, the ship will drift away, dragging its anchor behind. You should find a location where the seabed is not rocky and is a bit softer (clay-type). This seabed will allow the anchor to dig in and grip well. Such a gripping anchor will keep the ship stationary even in harsh weather conditions. Additionally, the depth of the water where you’re anchoring should be suitable.
2- Always Consider the Depth of the Seabed and Wind
Depth of the seabed is another important consideration. Various devices are available to measure seabed depth. It is worth noting that seabed depth directly controls how much the anchor chain is used. If you ignore depth, you might end up giving less anchor chain.
As a result, the anchor won’t reach the seabed for digging in. So the anchor will keep dragging instead of gripping the seabed. Additionally, you should also consider the direction of the wind and the intensity of the current. Ideally, your vessel should be facing the wind when anchored. Ignoring wind direction, current intensity, or seabed depth will compromise anchoring.
3- Correct Position & Reduce the Speed (Aim to Stop)
As I mentioned above, your ship must face the wind when anchoring. For this, you should position your ship correctly. Remember, when a ship faces winds, its speed automatically decreases due to air resistance. Apart from this, you should also reduce the speed of your ship or vessel. Before anchoring, your vessel’s speed should not be higher than 0.3 to 0.5 knots. The vessel’s speed should be reduced gradually before and during anchoring. After some time, your ship will eventually stop at one position but will keep drifting slightly until you drop anchor.
4- Drop the Anchor and Use the Right Length of Chain
Generally, marine experts say, “Drop the anchor”. But it does not mean throwing the anchor (a heavy metal device) onto the seabed. Instead, the anchor is lowered in a controlled manner so that it reaches the seabed. A harsh approach, like throwing the anchor, is not safe. Anchor chains are the pieces that connect the ship to the anchor.
Many people get confused about how much anchor chain to use (pay out). I recommend using a chain length of 4 to 7 times the water depth. For example, if the water depth is 10 meters, you should pay out 40 to 70 meters of chain. Remember, these long chains ensure the safety of the ship and vessels. Too short anchor chains may cause the anchor to drag, which is not good.
빠른 하이라이트: Large vessels typically have two anchors. These two anchors are dropped when the vessel needs to stay for a longer period. If you’re staying for a shorter duration, one anchor is enough to keep the ship stable. However, dropping the second anchor is similar to dropping the first. However, you should only drop it when either the first anchor fails or you stay for a long time.
5- Slight Reverse Thrust for Best Results
As I said earlier, the anchor is dropped, and it digs into the seabed. If this anchor does not settle firmly on the seabed, its chances of dragging are high. Therefore, you should apply a small reverse thrust on your ship or vessel. This will result in a backward force that ensures the anchor digs into the seabed. Once the anchor settles firmly, it will offer excellent holding power. The ship or vessel won’t drift or move away, which is a significant advantage.
6- Secure Anchor Chain & Monitoring
Reverse thrust provides a backward force that allows the anchor to grip the seabed. Once done, the last step is to secure the anchor chain using a chain stopper. This secures the anchor chain and prevents it from running out under sudden loads. At this stage, your ship or vessel will be anchored perfectly.
However, you should keep monitoring the ship after anchoring. The reason is that it ensures the ship does not drift under any circumstances. Monitoring is for peace of mind, as ships generally do not drift when anchored properly. As you know, in the sea, you cannot rely on the naked eye to check if the ship is moving or drifting from its anchored position, right?
This can be even more difficult at night. That’s where advanced tools come in handy in monitoring the anchored ship or vessel. For this monitoring, I recommend using GPS tools. Interestingly, there are several ways to monitor a ship’s position when anchored. However, using GPS devices gives accurate positioning of the ship. If the ship is drifting slowly, you should recheck the anchor to see if it is dragging.
자주 묻는 질문
What is the purpose of the anchor chain?
The purpose of anchor chains is to connect the anchor to the ship. These anchors are used to release the anchor into the seabed. They are also useful in ensuring the anchor digs into the seabed through their horizontal pull.
What happens if anchoring is done incorrectly?
If anchoring is done incorrectly, the ship or vessel will not remain stationary. Instead, the anchor will keep dragging, resulting in uncontrolled ship drift. Such ships can collide with nearby vessels, causing serious accidents.
Is anchoring and mooring done similarly?
아니요. Anchoring and mooring are different marine operations. Anchoring is done by dropping an anchor to keep ships in place. Mooring is done using a mooring line tied to buoys for a temporary stay. Both help ships stay in one place, but they work differently.
결론
Let’s conclude – anchoring is an important process, but if done wrongly, it can do more harm than good. Many mariners make anchoring mistakes and then find their ships drifting despite being anchored. That’s why I wrote this article to discuss all essential steps involved in anchoring a ship to maintain stability and safety.
Remember, anchoring a ship is not a one-stop process. Instead, there are different steps involved that ensure the smooth stay of the ships at sea. Small mistakes in anchoring can cause the ship to drift away. It is essential to follow all the protocols when anchoring. Each step discussed above is equally important for the safety and stability of the ships.