Refloating A Boat Dock: Simple Steps To Success

Refloating a boat dock can be a challenging task, requiring careful planning and execution. Whether you're dealing with a sunken boat or simply need to lift a floating dock for maintenance, there are several methods and techniques to consider. Inflatable lifting systems, such as airbags or lift bags, are often used to refloat boats, while floating docks can be manually lifted with manpower, mechanically with machinery like boat lifts, or hydraulically with hydraulic cylinders or jacks. Proper preparation, including cleaning the dock, securing loose items, and disconnecting utility lines, is crucial before attempting any lifting or refloating operation.

Using inflatable lifting systems

Inflatable lifting systems are a great way to refloat a boat dock without causing damage to the boat's hull. This method is also useful if you want to avoid the cost of renting a demolition dock or beaching basin.

Inflatable lifting systems are flexible and can be strapped around the boat's hull to provide stability and buoyancy. The number of airbags or lifting units required will depend on the size and weight of the boat. For example, a 30-foot yacht may require four 5-ton bags, while a larger vessel may need 18 RDF lifting units with a capacity of 10,000 L and four RDF units of 32,000 L.

When using inflatable lifting systems, it is important to ensure that the airbags are properly positioned and secured before inflation. This can be done by tying the lifting straps to sturdy fixtures on the deck or bollards. Once the bags are inflated, the boat can be towed to safety.

Inflatable lifting systems are also beneficial for ongoing boat maintenance. They can be used to lift boats out of the water to prevent damage from algae, barnacles, and corrosion. This type of system is more affordable than other boat lift systems and can be easily installed by the boat owner.

Manual methods with manpower

If your boat has sunk or run aground, there are a few methods you can use to refloat it manually. Here are some detailed, step-by-step instructions for manual methods with manpower:

Using Airbags or Lift Bags

Airbags or lift bags can be placed under the bow of the boat to lift it and bring it close to vertical. This will put the ports above the water level, after which you can start pumping out the water. It is recommended to use at least four airbags or lift bags for this method. You will need to ensure that the straps of the bags are tied securely to the boat to prevent any damage during the process.

Using Anchors and Halyards

If your boat is leaning against a dock or aground, you can use anchors and halyards to straighten it. Take out one or two anchors, set them to port, and attach them to the halyards. By pulling on the halyards, you can bring the boat closer to vertical, raising the ports above the water level. Once the boat is in this position, you can start pumping out the water.

Using Pumps

If your boat is only partially submerged, you may not need bags or airbags. Instead, focus on stemming the inflow of water and use pumps to remove the water from the boat. Close off as many "water in" sites as possible, such as bashed ports or holes in the hull. Use a large pump to remove the water, and continue pumping until the boat has enough buoyancy to refloat.

Using Tow Lines

If your boat is beached, you can use a tow line to pull it off the shore. This method may require a fishing boat or another vessel to assist in the towing process. It is important to wait for suitable conditions, such as low tide or calm waters, to minimize the risk of damage to the hull or keel. Ensure that the tow line is securely attached to both the boat and the towing vessel before attempting to refloat.

Manual Righting

In some cases, it may be possible to right a flooded boat manually without the use of airbags or pumps. This method involves a significant amount of manpower and should only be attempted if the boat is relatively small and accessible. Ensure that all hatches are closed, then use human power to turn the boat upright and pump out the water.

Remember to assess the situation and choose the method that best suits your specific circumstances. Each case of a grounded or sunken boat is unique, and you may need to adapt these methods accordingly. Safety should always be a top priority, so exercise caution and seek professional help if you are unsure about any aspect of the refloating process.

Mechanical lifting with machinery

If you are looking to refloat a boat dock using machinery, there are a few methods you can employ. Here is a detailed, step-by-step guide on how to achieve this:

One option for refloating a boat dock is to use mechanical lifting equipment such as cranes or hydraulic jacks. This method involves using powerful machinery to physically lift the dock out of the water and reposition it. Here's a step-by-step guide on how to approach this process:

• Assess the Situation: Before beginning any refloating operation, it is crucial to assess the situation and understand the extent of the problem. Inspect the boat dock for any visible damage, taking note of any cracks, leaks, or structural issues. This step will help determine the best course of action and identify any potential hazards.
• Choose the Right Machinery: Select the appropriate mechanical lifting equipment for the job. This could include mobile cranes, hydraulic jacks, or other specialised lifting machinery. Consider factors such as the size and weight of the boat dock, the depth of the water, and any access restrictions that may impact the choice of machinery.
• Prepare the Work Area: Ensure that the work area is safe and secure. Establish clear boundaries and restrict access to unauthorised personnel. If necessary, implement traffic control measures and notify nearby residents or businesses of the upcoming operation.
• Position the Machinery: Carefully position the chosen machinery in the vicinity of the boat dock. Ensure that the ground is stable and can support the weight of the machinery and the load. If working over water, take necessary precautions to prevent any accidental falls or equipment damage.
• Stabilise the Boat Dock: Before attempting to lift the boat dock, it may be necessary to stabilise it to prevent further sinking or instability. This can be done using temporary supports or struts attached to the dock's structure. Additionally, ensure that any utilities, such as electricity or water, are disconnected to avoid hazards during the lifting process.
• Attach Lifting Equipment: Use appropriate slings, chains, or straps to securely attach the lifting equipment to the boat dock. Distribute the load evenly to avoid placing excessive stress on any single point. Ensure that all attachments are secure and able to bear the weight of the dock.
• Lift the Boat Dock: Following the manufacturer's instructions and industry safety guidelines, carefully operate the machinery to lift the boat dock. Communicate clearly with the team throughout the process to ensure everyone's safety. If necessary, adjust the position of the lifting equipment to achieve a stable and balanced lift.
• Reposition the Dock: Once the boat dock is lifted out of the water, you can now reposition it as needed. This may involve moving it to a nearby location for repairs or maintenance, or simply adjusting its position within the body of water. Ensure that the new location is suitable and will not cause further issues.
• Lower and Secure the Dock: After the dock has been repositioned, carefully lower it back into the water, ensuring it is securely anchored and stabilised. Double-check all attachments and supports to guarantee the dock's stability and safety.
• Clean-up and Maintenance: Once the boat dock is refloated and secured, conduct a final inspection and perform any necessary maintenance or repairs. Clean up the work area, removing any debris or waste generated during the operation. Ensure that all equipment is properly stored or returned, and conduct a post-operation review to identify any areas for improvement.

Remember, safety should always be the top priority when working with heavy machinery and in aquatic environments. Ensure that you have the necessary training, qualifications, and permits to operate the chosen machinery and always follow industry best practices and guidelines.

Hydraulic lifting with cylinders or jacks

Hydraulic lifting systems are an excellent way to refloat a boat dock. These systems use hydraulic power to lift and lower boats onto and off the water. They are more than just accessories; they are essential for helping you effortlessly lift and lower your vessel when docking to ensure safety and security.

Hydraulic cylinder lifts are responsible for lifting and lowering the boat. They are made with an aluminium hydraulic cylinder and utilise biodegradable hydraulic fluid. The weight of the boat is transferred to a swing carriage on a fixed base frame. The carriage swings forward during the lifting process and back during the down cycle. The swing carriage is connected to a hydraulic ram, which is powered by a DC motor and pump, which does the work of lifting and lowering the boat.

Hydraulic cantilever lifts are best used in water depths between 3 and 6 feet, with minor water level fluctuations and a firm lake bottom. They are typically used to support Bowriders, Cruisers, Runabouts, Speed Boats and Watersport boat styles.

Vertical hydraulic lifts are ideal for water depths between 3 and 7 feet, with minor water level fluctuations and soft, semi-firm, or firm lake bottom conditions. They are best suited for areas with fluctuating water levels or limited space, where vertical lifting is necessary.

Hydraulic lifts are a safe, efficient, and adaptable way to refloat a boat dock.

Using lift bags

Step 1: Choose the Right Type of Lift Bag

The type of lift bag you choose will depend on the size and weight of your boat, as well as the depth of the water. Some common types of lift bags include:

• Totally Enclosed Marine Salvage Airbags: These are made of PVC-coated fabric and are lightweight, easy to transport, and can be reinforced for heavy-duty use. They have auto air pressure release valves that open when the inner pressure reaches a certain level.
• Marine Salvage Rubber Airbags: These are made of heavy-duty synthetic-tire-cord layers with inner and outer rubber layers. They are highly resistant to scratches and abrasion but are also very heavy, making them unsuitable for small vessel salvage.
• Pillow Flotation Lift Bags: These are made of high-strength PVC-coated fabric and are ideal for light underwater salvage. They can be used in shallow water and have a large lift capacity.

Step 2: Position the Lift Bags

Once you have chosen the appropriate lift bags, you will need to position them correctly to refloat your boat dock. For smaller boats, you can sling the lift bags under the boat, with one end on each side. This will raise the boat high enough out of the water to pump it out. For larger boats, you may need to use multiple lift bags together, positioned like pontoons on each side of the boat.

Step 3: Inflate the Lift Bags

After the lift bags are in position, you can begin inflating them. For enclosed lift bags, you will need to use a compressor to fill them with air. Pillow lift bags can be filled with compressed air until they have enough flotation to overcome the negative buoyancy of the vessel.

Step 4: Monitor and Adjust

As the lift bags inflate, you will need to monitor the boat's position and make adjustments as necessary. This may involve moving the lift bags or adding additional bags to achieve the desired level of flotation. It is important to work slowly and carefully to avoid placing too much stress on the boat's structure.

Step 5: Pump Out the Boat

Once the boat is raised to a suitable level, you can begin pumping out any water that is inside the boat. This will further reduce the boat's weight and help it to refloat. Make sure to use a pump with a good mesh filter to prevent debris from clogging the intake.

Frequently asked questions