Boat Salvage Lift Bag Reliable Buoyancy Durable Construction Quick
Setup
Description
The Boat Lift Helper, also known as Cylindrical Underwater Lift
Bags, is a professional-grade buoyancy aid designed to safely lift,
support, or salvage vessels and underwater structures. Made from
heavy-duty, tear-resistant coated fabrics, these lift bags provide
reliable buoyant force in both shallow and deep-water conditions.
Each bag is engineered for quick deployment, controlled ascent, and
maximum safety, making it an essential tool for marine contractors,
salvage divers, and emergency response teams.
Unlike traditional square or pillow-shaped lift bags, the Boat Lift
Helper’s cylindrical design provides a streamlined, low-drag
profile underwater. This minimizes sway and rotational forces
during ascent, allowing for precise and stable lifting of loads
ranging from small boats to large marine structures. Reinforced
D-rings and straps offer secure attachment points for rigging,
while high-visibility panels ensure divers can monitor the lift
bag’s position at all times.
Case Study
In 2023, a marine salvage company in Miami used 12 Boat Lift Helper
units to recover a 12-ton fishing vessel that had sunk at a marina
entrance. The cylindrical lift bags were deployed by a three-diver
team in less than 30 minutes. Once attached, the bags were
gradually inflated to raise the vessel with minimal roll or sway,
allowing a controlled tow to shore. The salvage team reported a 40%
reduction in time compared to their previous square-style lift
bags.
Specifications
| Product Name | Boat Lift Helper |
| Raw Material | PVC Coating Fabric |
| Type | Cylindrical |
| Size | 500kg, 1000kg, 5000kg 10000kg,etc |
| Thickness | 0.4-1.2mm, Or as request |
| Color | Yellow, Blue, Black, etc |
| Density | 0.33-0.9g/cm3 |
| Safety Factor | 7:1 |
Tolerances | +/- 0.03 on Densities +/- 0.2 mm on Thickness +/- 0 to +3mm on Width +/- 0 to +3mm on Length |
| Model | Buoyancy | Diameter | Length | Appr. Weight |
| Cylindrical | [kg] | [lbs] | [mm] | [mm] | [kg] |
| HM-BLH01 | 200 | 441 | 500 | 1,000 | 5 |
| HM-BLH02 | 500 | 1,103 | 800 | 1,000 | 8 |
| HM-BLH03 | 1,000 | 2,205 | 1,000 | 1,500 | 11 |
| HM-BLH04 | 2,000 | 4,410 | 1,300 | 1,500 | 20 |
| HM-BLH05 | 4,000 | 8,820 | 1,600 | 2,000 | 50 |
| HM-BLH06 | 6,000 | 13,230 | 2,000 | 2,000 | 66 |
| HM-BLH07 | 8,000 | 17,640 | 2,000 | 2,600 | 75 |
| HM-BLH08 | 10,000 | 22,050 | 2,400 | 2,400 | 80 |
| HM-BLH09 | 15,000 | 33,075 | 2,600 | 3,000 | 110 |
| HM-BLH10 | 20,000 | 44,100 | 3,000 | 3,000 | 130 |
| HM-BLH11 | 30,000 | 66,150 | 3,000 | 4,500 | 170 |
| HM-BLH12 | 50,000 | 110,250 | 4,000 | 4,000 | 220 |
| HM-BLH13 | 70,000 | 154,350 | 4,000 | 5,700 | 310 |
| HM-BLH14 | 100,000 | 220,500 | 4,000 | 8,000 | 450 |
| HM-BLH15 | 150,000 | 330,750 | 5,000 | 8,000 | 660 |
| HM-BLH16 | 200,000 | 441,000 | 5,000 | 10,000 | 900 |
| *Note: Other sizes can be customized according to the requirements. |
Features
High Buoyancy and Stable Ascent
Each Boat Lift Helper unit offers high buoyant force, ranging from
1 ton to over 50 tons per bag depending on the model. The
cylindrical design distributes buoyancy evenly, reducing rolling
forces on the load and ensuring a straight, controlled ascent.
Pressure relief valves allow divers to fine-tune buoyancy
underwater for maximum safety.
Heavy Duty Tear Resistant Fabric
Constructed from double-coated, high-strength PVC or polyurethane
fabric, the lift bags resist abrasion, tearing, UV exposure, and
chemical corrosion. Reinforced seams are RF-welded for maximum
airtightness. In internal testing, the bags maintained 98% of their
rated buoyancy after 100 repeated inflation/deflation cycles in
saltwater.
Quick Deployment and Easy Handling
The compact, rollable design allows the bags to be transported
easily by hand or in a small boat. Inflation is compatible with
standard scuba cylinders or low-pressure air compressors.
Integrated webbing straps and stainless-steel D-rings allow divers
to attach the bag securely in seconds. A single diver can deploy
and inflate a small bag in under 5 minutes.
Safety and Control Features
Each Boat Lift Helper is equipped with overpressure relief valves
and multiple inflation ports for redundancy. High-visibility colors
improve diver awareness. Optional anti-tear safety patches and
secondary securing straps provide an extra layer of protection
during heavy lifts or emergency recoveries.
Applications
Boat and Yacht Salvage
Ideal for recovering sunken boats, personal watercraft, or yachts
of various sizes. Divers can attach multiple bags to distribute lifting force and
safely raise vessels to the surface for towing or repairs.
Marine Construction and Maintenance
Supports underwater placement or removal of structures such as
pilings, pipelines, or mooring anchors. The cylindrical design minimizes drag, making it easier to position
large objects precisely.
Emergency Response and Rescue
In flood or disaster scenarios, lift bags can stabilize overturned
vessels, assist in underwater recovery, or provide temporary
flotation for emergency equipment.
Why Choose Hongruntong Marine?
Advanced RD and Product Innovation
Hongruntong Marine has over 20 years of experience in marine
equipment manufacturing. Our R&D team uses advanced simulation
software to optimize buoyancy distribution and structural integrity
of every Boat Lift Helper model. All designs are validated through real-world testing in offshore
conditions, ensuring unmatched reliability and performance.
Strict Manufacturing Process and Quality Control
Each lift bag is produced in an ISO 9001-certified facility. From raw material inspection to final testing, we apply rigorous
quality standards. Every batch undergoes hydrostatic testing for buoyancy capacity,
seam strength, and valve performance. Traceable serial numbers allow full product tracking and
maintenance history, giving customers confidence in long-term
performance.
Proven Track Record with Global Clients
Hongruntong Marine lift bags are trusted by salvage companies,
navies, and offshore contractors in over 30 countries, including
the US, Europe, and Southeast Asia. For example, our Boat Lift Helpers were used by a Norwegian firm to
recover a 300-ton floating dock section in 2022, successfully
completing the lift ahead of schedule.
Comprehensive Service and After-Sales Support
We provide full technical support, including deployment training,
maintenance manuals, and 24/7 after-sales assistance. Spare parts such as valves and straps are readily available. Our service teams can also assist on-site for large or complex
lifts, ensuring safe and efficient operations for every customer.
FAQ
1. What lifting capacities are available for the Boat Lift Helper?
We offer models ranging from 1-ton to 50-ton buoyancy per bag. Multiple bags can be combined to lift larger loads. For example, three 10-ton bags can safely lift a 30-ton vessel.
2. How should the Boat Lift Helper be maintained?
After use, rinse with fresh water to remove salt and debris.
Inspect seams, valves, and straps for wear. Store deflated and rolled in a dry, shaded area. With proper maintenance, each bag can last 8–12 years in regular
service.
3. What are the operating conditions for these lift bags?
They are designed for temperatures from -20°C to 60°C. The fabric resists UV exposure, hydrocarbons, and saltwater. Overpressure valves prevent accidental bursting during inflation. Bags can be inflated with standard scuba cylinders,
surface-supplied air, or low-pressure compressors.
4. Are the bags compatible with other lifting or rigging equipment?
Yes. Reinforced D-rings and webbing straps fit standard shackles,
chains, and lifting slings. They can be integrated with cranes, winches, or tow vessels for
combined operations. For example, a salvage team in Florida used our bags with a crane
barge to lift a 20-ton barge section.
