Buoyancy Bags are advanced inflatable lifting devices engineered to provide precise, reliable, and controlled underwater lifting solutions. They are designed for a broad range of subsea operations, including salvage, recovery, construction, and offshore maintenance.
Manufactured using high-strength synthetic fabrics coated with elastomeric polymers, these bags deliver exceptional performance in terms of tensile strength, puncture resistance, and long-term air retention.
Each unit features reinforced lifting points, automatic pressure relief valves, and corrosion-resistant fittings to ensure maximum safety and operational reliability. The open-bottom design allows for self-regulating air release during ascent, preventing sudden pressure buildup and ensuring a smooth, controlled lift.
In 2024, a major renewable energy contractor required a solution for lifting and repositioning a subsea transition piece that had settled unevenly during offshore wind turbine installation. The structure weighed approximately 12 tons and was located 22 meters underwater in a strong current area.
Hongruntong Marine supplied Buoyancy Bags designed specifically for controlled vertical lift and precise orientation control. Eight lifting units with 1.5-ton capacity each were attached evenly along the structure's perimeter using high-strength slings and certified shackles.
The project was completed 30% faster than the initial schedule, with zero incidents or structural damage. Following the success of this project, the contractor standardized Hongruntong Marine's Buoyancy Bags for all subsequent offshore maintenance campaigns.
| Product Name | Buoyancy Bags |
|---|---|
| Raw Material | Top Notch PVC Coating Fabric |
| Type | Parachute |
| 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 |
| Accessories | Valve, Inflatable Tube, Repair Material |
| OEM | Welcome |
| Warranty | 3 Years |
| Tolerances | +/- 0.03 on densities +/- 0.2 mm on thickness +/- 0 to +3mm on width +/- 0 to +3mm on length |
| Model | Lifting Capacity (kg) | Lifting Capacity (lbs) | Dimensions (mm) | Approx. Weight (kg) |
|---|---|---|---|---|
| HM-P01 | 200 | 441 | 800 | 5 |
| HM-P02 | 500 | 1,103 | 1,000 | 8 |
| HM-P03 | 1,000 | 2,205 | 1,300 | 11 |
| HM-P04 | 2,000 | 4,410 | 1,600 | 20 |
| HM-P05 | 4,000 | 8,820 | 2,000 | 50 |
| HM-P06 | 6,000 | 13,230 | 2,300 | 66 |
| HM-P07 | 8,000 | 17,640 | 2,500 | 75 |
| HM-P08 | 10,000 | 22,050 | 2,700 | 80 |
| HM-P09 | 15,000 | 33,075 | 3,100 | 110 |
| HM-P10 | 20,000 | 44,100 | 3,400 | 130 |
| HM-P11 | 30,000 | 66,150 | 3,900 | 170 |
| HM-P12 | 50,000 | 110,250 | 4,600 | 220 |
| HM-P13 | 70,000 | 154,350 | 5,200 | 310 |
| HM-P14 | 100,000 | 220,500 | 5,800 | 450 |
| HM-P15 | 150,000 | 330,750 | 6,600 | 660 |
| HM-P16 | 200,000 | 441,000 | 7,300 | 900 |
A: Standard Buoyancy Bags range from 200 kg to 50 tons, with custom models available upon request.
A: Compressed air is standard; nitrogen or inert gases may be used in specialized environments.
A: Use multiple bags with synchronized inflation manifolds, maintain equal pressure, and monitor load distribution via gauges or sensors.
A: Rinse with fresh water, inspect for abrasions or punctures, dry completely, and store in a cool, ventilated space away from direct sunlight.
A: Yes. Hongruntong Marine offers on-site setup training, technical consultation, and operational safety workshops for all clients.
