Hongruntong Marine LLC.
| Payment Terms | L/C, T/T, D/A, D/P, Western Union, MoneyGram |
| Supply Ability | 5891 Pcs Per Month |
| Delivery Time | 5-8 Work Days |
| Packaging Details | Wooden Pallets, Wooden Box |
| Name | Underwater Air Lift Bags |
| Material | Top-Notch PVC Coating Fabric |
| Lifting Capacity | 200Kg to 50 Tons |
| Layers | 1-6Ply, or As Request |
| Feature | Superior Buoyancy |
| Type | Parachute |
| Reinforcement | Nylon Fabric |
| Color | Black, Yellow, Orange, or As Request |
| Thickness | 0.4mm-2.5mm, or As Request |
| Valve | Inflation and Pressure Release |
| Usage | Underwater Air Lifting, Salvage, Large Buoyancy |
| Application | Salvage Operations, Underwater Construction |
| Brand Name | Hongruntong Marine |
| Model Number | HM-UALB15 |
| Certification | ISO, BV, ABS, DNV, LR, SGS, CCS, RMRS |
| Place of Origin | China |
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Product Specification
| Payment Terms | L/C, T/T, D/A, D/P, Western Union, MoneyGram | Supply Ability | 5891 Pcs Per Month |
| Delivery Time | 5-8 Work Days | Packaging Details | Wooden Pallets, Wooden Box |
| Name | Underwater Air Lift Bags | Material | Top-Notch PVC Coating Fabric |
| Lifting Capacity | 200Kg to 50 Tons | Layers | 1-6Ply, or As Request |
| Feature | Superior Buoyancy | Type | Parachute |
| Reinforcement | Nylon Fabric | Color | Black, Yellow, Orange, or As Request |
| Thickness | 0.4mm-2.5mm, or As Request | Valve | Inflation and Pressure Release |
| Usage | Underwater Air Lifting, Salvage, Large Buoyancy | Application | Salvage Operations, Underwater Construction |
| Brand Name | Hongruntong Marine | Model Number | HM-UALB15 |
| Certification | ISO, BV, ABS, DNV, LR, SGS, CCS, RMRS | Place of Origin | China |
| High Light | 15t underwater lifting bag ，parachute type lift bag durable ，underwater air lift bag long service life | ||
15t Parachute Type Underwater Lifting Bag Durable Material Long Service Life
Description
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.
Case Study — Offshore Pipeline Installation, UAE
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.
Specifications
| 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 | |
| Parachute | [kg] | [lbs] | [mm] | [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 |
| *Note: Other sizes can be customized according to the requirements. | ||||
Features
Parachute Shaped Vertical Stability Design
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.
High Tensile, Dual Layer Fabric
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.
Integrated Safety and Inflation Control
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.
Modular, Scalable, and Reusable
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.
Applications
Offshore Oil Gas Pipeline Installation
Used to lift and stabilize long, heavy subsea pipelines during placement. The parachute-shaped design ensures vertical stability and controlled buoyancy, even in strong currents. Compatible with diver-operated or remote-controlled inflation systems for precision handling.
Subsea Module Deployment
Ideal for positioning subsea production units, ROV platforms, and equipment modules. Allows for controlled, incremental lift and placement on uneven seabed surfaces. Multi-unit connection enables high-capacity lifting for oversized structures.
Salvage and Recovery Operations
Used for offshore salvage tasks including sunken vessels, anchors, or subsea containers. The bags provide reliable lift and stability in complex marine environments, improving operational safety and efficiency for offshore recovery projects.
Why Choose Hongruntong Marine
Proven Offshore Engineering Expertise
Hongruntong Marine has over 20 years of experience supplying underwater air lift bags and marine lifting solutions worldwide. Our products have been deployed in hundreds of offshore projects, including oil rigs, subsea pipeline installations, and salvage operations.
Custom Engineering & OEM Capability
We provide fully customized lift bags tailored to project requirements, including adjustable buoyancy, fabric type, parachute shape, and valve configurations. OEM branding and design modifications are available to meet client specifications.
Global Technical Support
Hongruntong offers worldwide technical support, including 24/7 consultation, on-site guidance, and spare parts logistics. Our professional team assists clients in operational planning, deployment strategies, and maintenance, ensuring maximum performance and safety.
Rigorous Quality Assurance
Every lift bag undergoes hydrostatic testing, pressure verification, and quality inspection before shipment. Our ISO 9001 certified manufacturing process ensures reliability, durability, and operational safety in offshore and diving environments.
FAQ
1. What buoyancy range is available?
From 1 ton to 50 tons, with customized capacities available.
2. Can these lift bags be used in deep-water offshore operations?
Yes, designed for depths up to 100 meters or more, depending on specifications.
3. Are repair kits included for field maintenance?
Yes, each bag includes patch kits and valve maintenance tools for minor on-site repairs.
4. Are these bags compatible with standard diving air systems?
Yes, all bags are compatible with scuba tanks and offshore compressed air sources.
5. Do you provide OEM branding or custom printing?
Yes, logos, serial numbers, and custom specifications can be applied for bulk orders.
Company Details
Business Type:
Manufacturer
Year Established:
1990
Total Annual:
5,256,780-5,593210
Employee Number:
220~360
Ecer Certification：
Verified Supplier
Hongruntong Marine is a leading marine company specializing in providing comprehensive services in the maritime industry. With a strong emphasis on quality, safety, and efficiency, we strive to meet the evolving needs of our clients. Established in 1990, Hongruntong Ma... Hongruntong Marine is a leading marine company specializing in providing comprehensive services in the maritime industry. With a strong emphasis on quality, safety, and efficiency, we strive to meet the evolving needs of our clients. Established in 1990, Hongruntong Ma...
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