Hongruntong Marine LLC.
| Payment Terms | L/C, T/T, D/A, D/P, Western Union, MoneyGram |
| Supply Ability | 2154 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 |
| Thickness | 0.4mm-2.5mm, or As Request |
| Type | Parachute |
| Reinforcement | Nylon Fabric |
| Color | Black, Yellow, Orange, 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-UALB5 |
| 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 | 2154 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 | Thickness | 0.4mm-2.5mm, or As Request |
| Type | Parachute | Reinforcement | Nylon Fabric |
| Color | Black, Yellow, Orange, 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-UALB5 |
| Certification | ISO, BV, ABS, DNV, LR, SGS, CCS, RMRS | Place of Origin | China |
| High Light | 10t underwater air lift bags ，underwater air lift bags with reinforced seams ，strong buoyancy air lift bags | ||
10t Underwater Air Lift Bags Strong Buoyancy Reinforced Seams Easy Operation
Description
Hongruntong Marine’s Underwater Air Lift Bags are precision-engineered buoyancy devices designed for safe and efficient lifting, refloating, and underwater transportation of heavy marine structures. Constructed from high-tensile, reinforced PVC-coated polyester fabric, these lift bags deliver superior strength, flexibility, and abrasion resistance in harsh marine environments.
Each lift bag is equipped with over-pressure valves, stainless steel fittings, and multi-point lifting straps to ensure balanced buoyancy distribution. The design supports both open-bottom and enclosed types, suitable for lifting sunken vessels, underwater structures, and subsea pipelines. The buoyancy range covers 1 ton to 50 tons, customizable to meet specific salvage or diving project needs.
Case Study — Vessel Refloating in Singapore Harbor
In 2024, Hongruntong Marine collaborated with a Singapore-based salvage contractor to refloat a 22-meter fishing vessel that had sunk in shallow waters near Tuas Port. The operation used eight 15-ton Underwater Air Lift Bags arranged symmetrically along the hull.
Divers attached the lift bags to pre-installed lifting points, and compressed air was carefully introduced in stages to maintain balance and prevent sudden buoyant shifts. Within four hours, the vessel achieved neutral buoyancy and was safely towed to the dockyard.
Despite rough current conditions, Hongruntong’s reinforced seams and precision pressure-control valves prevented leakage or instability. The client highlighted the quick setup, stability, and reusability of the equipment, which saved over 30% operational time compared to conventional lift systems.
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
High Tensile Reinforced Fabric
The lift bags are constructed from heavy-duty PVC-coated polyester with tensile strength exceeding 5000 N/5 cm. The material resists abrasion, puncture, and UV degradation, ensuring consistent performance in seawater and hydraulic conditions.
Multi Point Lifting System
Each bag includes reinforced webbing harnesses with stainless steel D-rings and shackles, providing secure load distribution. The system allows controlled inflation and lifting, reducing torsion and drift underwater.
Integrated Safety Valves and Inflation Ports
Hongruntong lift bags feature automatic over-pressure relief valves, high-flow inflation ports, and one-way check valves compatible with standard diving air systems. These features guarantee operational safety and ease of maintenance.
Modular and Reusable Design
Each air lift bag is lightweight, foldable, and easy to transport. Reusable up to 200 cycles, it supports both vertical and horizontal lifting configurations, maximizing adaptability for complex salvage operations.
Applications
Shipwreck and Vessel Recovery at Ports
Ideal for refloating fishing boats, tugboats, or barges that have sunk in harbor areas or near docks.
Pipeline and Subsea Equipment Installation
Commonly used for buoyant support when installing or maintaining underwater oil, gas, or communication lines.
Bridge and Port Construction Support
Provides controlled buoyancy for heavy prefabricated concrete or steel components in bridge or port expansion projects.
Why Choose Hongruntong Marine
20+ Years of Marine Engineering Expertise
Hongruntong Marine has been a trusted partner in marine equipment manufacturing, serving over 40 countries with ISO-certified production facilities.
Custom Engineering OEM Capability
We provide fully customized air lift bags with adjustable buoyancy, fabric type, and connection fittings to meet diverse project requirements.
Global Support Network
Our professional service team offers 24/7 technical assistance, spare parts supply, and on-site commissioning worldwide.
Proven Safety and Quality Control
Every lift bag undergoes hydrostatic testing and full inspection before shipment, guaranteeing reliability and operational safety.
FAQ
1. What buoyancy range is available?
From 1 ton to 50 tons, with custom sizes available.
2. Can these lift bags be used in saltwater environments?
Yes, all materials are saltwater- and UV-resistant.
3. Do you provide repair kits?
Each unit includes a repair kit and valve maintenance tools.
4. Can we request OEM branding or custom printing?
Yes, logos and serial numbers can be customized.
5. What is the typical delivery time?
Usually 10–15 working days depending on quantity.
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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