The Parachute Type Underwater Air Lift Bags from Hongruntong Marine are precision-engineered solutions for lifting, refloating, and stabilizing heavy offshore structures. Designed to operate under challenging marine environments, these underwater air lift bags combine high tensile strength, corrosion resistance, and precise buoyancy control to deliver exceptional performance in subsea engineering, offshore construction, and salvage operations.
Constructed from high-tensile nylon fabric with dual-layer PVC coating, these bags withstand abrasion, puncture, and chemical exposure, making them ideal for long-term use in seawater and oil-contaminated environments. Reinforced seams, stainless steel fittings, and integrated multi-point lifting straps ensure uniform load distribution, minimizing stress concentrations and risk of failure.
The parachute-shaped design offers vertical stability during inflation, reducing oscillation and drift, even when lifting long pipelines, subsea modules, or irregularly shaped components. Over-pressure relief valves and one-way check valves provide safe and controllable inflation, while compatibility with standard diving air systems and offshore compressors allows versatile deployment in various operational scenarios.
With buoyancy capacities ranging from 1 ton to 50 tons, these lift bags can be used individually or in series, providing scalable solutions for projects of all sizes. Foldable, lightweight, and reusable, they enable rapid deployment and retrieval, significantly improving operational efficiency while maintaining strict safety standards.
In 2023, Hongruntong Marine collaborated with a leading offshore contractor in Abu Dhabi to facilitate the installation of a 1.2 km subsea oil pipeline. The project presented multiple challenges: uneven seabed topography, strong currents, and the need to lift long, heavy pipe sections with precision.
Twelve 10-ton parachute type underwater lifting bags were deployed along the pipeline at strategic intervals. Divers attached each bag using reinforced stainless steel shackles and pre-marked lifting points. The multi-valve inflation system allowed fine-tuned adjustment of each bag's buoyancy in real-time, compensating for seabed irregularities and hydrodynamic forces.
The parachute-shaped lift bags maintained vertical alignment, minimizing swinging and torsional forces during ascent. The high-tensile, PVC-coated nylon fabric resisted abrasion from rocks and sediments, while over-pressure relief valves prevented sudden upward surges. This combination ensured safe, controlled lifting throughout the operation.
Within 48 hours, the pipeline section was successfully lifted, positioned, and secured to its designated seabed location. Compared to previous projects using conventional lift bags, Hongruntong's solution increased operational efficiency by 25%, reduced diver fatigue, and minimized safety risks. The project demonstrated the reliability, precision, and versatility of Hongruntong Marine's underwater air lift bags in offshore engineering applications.
| Product Name | Underwater Air Lift 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 | Dimensions | Appr. Weight |
|---|---|---|---|
| HM-P01 | 200 kg / 441 lbs | 800 mm | 5 kg |
| HM-P02 | 500 kg / 1,103 lbs | 1,000 mm | 8 kg |
| HM-P03 | 1,000 kg / 2,205 lbs | 1,300 mm | 11 kg |
| HM-P04 | 2,000 kg / 4,410 lbs | 1,600 mm | 20 kg |
| HM-P05 | 4,000 kg / 8,820 lbs | 2,000 mm | 50 kg |
| HM-P06 | 6,000 kg / 13,230 lbs | 2,300 mm | 66 kg |
| HM-P07 | 8,000 kg / 17,640 lbs | 2,500 mm | 75 kg |
| HM-P08 | 10,000 kg / 22,050 lbs | 2,700 mm | 80 kg |
| HM-P09 | 15,000 kg / 33,075 lbs | 3,100 mm | 110 kg |
| HM-P10 | 20,000 kg / 44,100 lbs | 3,400 mm | 130 kg |
| HM-P11 | 30,000 kg / 66,150 lbs | 3,900 mm | 170 kg |
| HM-P12 | 50,000 kg / 110,250 lbs | 4,600 mm | 220 kg |
| HM-P13 | 70,000 kg / 154,350 lbs | 5,200 mm | 310 kg |
| HM-P14 | 100,000 kg / 220,500 lbs | 5,800 mm | 450 kg |
| HM-P15 | 150,000 kg / 330,750 lbs | 6,600 mm | 660 kg |
| HM-P16 | 200,000 kg / 441,000 lbs | 7,300 mm | 900 kg |
Note: Other sizes can be customized according to the requirements.
The unique parachute shape ensures vertical alignment during inflation and ascent. Open-bottom construction allows controlled air venting as the lift approaches the surface, preventing sudden surges. This design is ideal for asymmetric loads and long structures like pipelines or modular subsea units. Vertical stability reduces torsion and oscillation, protecting both the load and operators in dynamic offshore conditions.
Constructed from high-tensile nylon with dual-layer PVC coating, the bags offer outstanding resistance to abrasion, UV exposure, chemical corrosion, and puncture. Reinforced seams and heat-welded edges enhance structural integrity, enabling repeated use under harsh offshore conditions. The fabric is designed to retain flexibility even under low temperatures and high-pressure underwater environments.
Each bag includes over-pressure relief valves, one-way check valves, and multiple inflation ports compatible with standard diving air systems and offshore compressors. This allows divers or operators to control inflation and buoyancy precisely. Multi-valve design prevents sudden lift surges, ensuring safe, incremental adjustments for long or heavy loads.
The bags can be connected in series to achieve higher lift capacities. Foldable, lightweight, and transportable, they can be reused for up to 200 operational cycles. Field-repairable kits are included for minor damages, allowing rapid maintenance without removing the bag from the offshore site. This modularity makes them ideal for complex offshore engineering operations requiring scalable buoyancy solutions.
From 1 ton to 50 tons, with customized capacities available.
Yes, designed for depths up to 100 meters or more, depending on specifications.
Yes, each bag includes patch kits and valve maintenance tools for minor on-site repairs.
Yes, all bags are compatible with scuba tanks and offshore compressed air sources.
Yes, logos, serial numbers, and custom specifications can be applied for bulk orders.
