Buoyancy Bags are high-performance inflatable devices designed for underwater lifting, floatation, and subsea support operations. Constructed from reinforced rubber and high-strength synthetic fabrics, these bags offer reliable buoyancy, high load-bearing capacity, and long-term durability. Their cylindrical design ensures even stress distribution, reducing the risk of deformation during inflation and extending operational lifespan.
Equipped with precision inflation and deflation valves and reinforced lifting eyes, Buoyancy Bags provide secure attachment to slings, chains, or rigging lines. The materials are resistant to abrasion, UV radiation, and saltwater corrosion, allowing safe deployment in harsh marine conditions. Compatible with compressed air or inert gas systems, these bags are highly adaptable for diverse underwater lifting applications.
In 2023, a coastal harbor faced an emergency when a small cargo vehicle accidentally slipped into a shallow dock area. Traditional cranes could not safely reach the vehicle due to limited water depth and surrounding structures. The engineering team deployed Buoyancy Bags to lift the vehicle underwater without causing further damage.
Three Buoyancy Bags, each 1.5 meters in diameter, were attached to the vehicle using reinforced slings. Controlled inflation allowed a gradual and stable lift, preventing sudden jolts that could damage the vehicle or nearby infrastructure. The vehicle was safely floated to the dockside, where it was retrieved with minimal risk.
This operation highlighted the stability, reliability, and precise handling of Buoyancy Bags under confined and challenging conditions. Post-operation inspection confirmed that the bags retained structural integrity, with no damage to materials or seams. The success of this project demonstrated that Buoyancy Bags are an effective solution for emergency salvage and controlled subsea lifting.
| Product Name | Buoyancy Bags |
| 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 [kg] | Buoyancy [lbs] | Diameter [mm] | Length [mm] | Appr. Weight [kg] |
|---|---|---|---|---|---|
| HM-ULB01 | 200 | 441 | 500 | 1,000 | 5 |
| HM-ULB02 | 500 | 1,103 | 800 | 1,000 | 8 |
| HM-ULB03 | 1,000 | 2,205 | 1,000 | 1,500 | 11 |
| HM-ULB04 | 2,000 | 4,410 | 1,300 | 1,500 | 20 |
| HM-ULB05 | 4,000 | 8,820 | 1,600 | 2,000 | 50 |
| HM-ULB06 | 6,000 | 13,230 | 2,000 | 2,000 | 66 |
| HM-ULB07 | 8,000 | 17,640 | 2,000 | 2,600 | 75 |
| HM-ULB08 | 10,000 | 22,050 | 2,400 | 2,400 | 80 |
| HM-ULB09 | 15,000 | 33,075 | 2,600 | 3,000 | 110 |
| HM-ULB10 | 20,000 | 44,100 | 3,000 | 3,000 | 130 |
| HM-ULB11 | 30,000 | 66,150 | 3,000 | 4,500 | 170 |
| HM-ULB12 | 50,000 | 110,250 | 4,000 | 4,000 | 220 |
| HM-ULB13 | 70,000 | 154,350 | 4,000 | 5,700 | 310 |
| HM-ULB14 | 100,000 | 220,500 | 4,000 | 8,000 | 450 |
| HM-ULB15 | 150,000 | 330,750 | 5,000 | 8,000 | 660 |
| HM-ULB16 | 200,000 | 441,000 | 5,000 | 10,000 | 900 |
Note: Other sizes can be customized according to the requirements.
A: Capacity depends on bag size and inflation pressure, typically ranging from 500 kg to over 10 tons. Custom options are available.
A: Compressed air, nitrogen, and other inert gases are compatible depending on operational requirements.
A: Yes, they are designed with UV and saltwater-resistant materials to maintain integrity under prolonged marine exposure.
A: Yes, multiple bags can be linked to lift heavier loads or ensure balanced buoyancy. Guidance is provided for optimal load distribution.
A: Check for punctures, seam integrity, valve operation, and correct inflation pressure before each deployment. Follow manufacturer guidelines for periodic maintenance.
