Inflatable Lift Bags: Strong Load Bearing, Easy Operation, Good Sealing
Product Overview
Heavy Duty Inflatable Air Bags made from reinforced PVC composite fabric are professional buoyancy devices engineered specifically for underwater salvage, subsea lifting, and controlled flotation operations. Designed for reliability in demanding marine environments, these air bags provide stable buoyant force for recovering submerged vessels, lifting offshore equipment, and assisting underwater construction activities.
The air bags are manufactured using high-tensile polyester fabric coated with marine-grade PVC, creating a robust yet flexible structure capable of withstanding hydrostatic pressure, mechanical abrasion, and long-term saltwater exposure. This material configuration ensures excellent airtightness, resistance to puncture, and strong tear strength while maintaining manageable weight for diver handling.
PVC inflatable air bags deliver adjustable buoyancy through controlled compressed-air inflation. This enables gradual lifting of submerged structures, reducing sudden load shifts and minimizing risk of secondary damage during salvage operations. Their flexibility allows close contact with irregular underwater surfaces, improving stability and load distribution compared with rigid lifting equipment.
These air bags are widely applied in marine salvage operations, underwater construction support, harbor maintenance projects, and offshore energy infrastructure installation. Their reusable design, easy transport, and cost efficiency make them an essential tool for professional diving teams and marine engineering contractors seeking safe, reliable, and adaptable lifting solutions.
Case Study: Offshore Pipeline Module Retrieval
During an offshore maintenance project in the Middle East, a pipeline connection module weighing approximately 120 tons accidentally sank during installation due to unexpected rigging failure. The module settled unevenly on a sandy seabed at moderate depth, creating challenges for crane lifting due to visibility limitations and seabed instability.
The salvage contractor selected PVC Heavy Duty Inflatable Air Bags as the primary buoyancy solution because they could be deployed by divers quickly and provide gradual lifting control. Divers attached multiple air bags around structural lifting points, ensuring balanced buoyancy distribution during inflation. Controlled air supply allowed the module to detach smoothly from the seabed while avoiding excessive stress on connection joints.
The module was successfully brought to a recoverable depth and safely retrieved without structural deformation. The contractor reported reduced operational risk, faster execution time, and significantly lower mobilization costs compared with heavy crane alternatives, confirming the practicality of inflatable air bags for subsea recovery tasks.
Technical Specifications
| Product Name |
Heavy Duty Inflatable Air 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, ±0.2mm on Thickness, ±0 to +3mm on Width, ±0 to +3mm on Length |
Model Specifications
| Model |
Buoyancy (kg) |
Buoyancy (lbs) |
Diameter (mm) |
Length (mm) |
Approx. Weight (kg) |
| HM-C01 |
200 |
441 |
500 |
1,000 |
5 |
| HM-C02 |
500 |
1,103 |
800 |
1,000 |
8 |
| HM-C03 |
1,000 |
2,205 |
1,000 |
1,500 |
11 |
| HM-C04 |
2,000 |
4,410 |
1,300 |
1,500 |
20 |
| HM-C05 |
4,000 |
8,820 |
1,600 |
2,000 |
50 |
| HM-C06 |
6,000 |
13,230 |
2,000 |
2,000 |
66 |
| HM-C07 |
8,000 |
17,640 |
2,000 |
2,600 |
75 |
| HM-C08 |
10,000 |
22,050 |
2,400 |
2,400 |
80 |
| HM-C09 |
15,000 |
33,075 |
2,600 |
3,000 |
110 |
| HM-C10 |
20,000 |
44,100 |
3,000 |
3,000 |
130 |
| HM-C11 |
30,000 |
66,150 |
3,000 |
4,500 |
170 |
| HM-C12 |
50,000 |
110,250 |
4,000 |
4,000 |
220 |
| HM-C13 |
70,000 |
154,350 |
4,000 |
5,700 |
310 |
| HM-C14 |
100,000 |
220,500 |
4,000 |
8,000 |
450 |
| HM-C15 |
150,000 |
330,750 |
5,000 |
8,000 |
660 |
| HM-C16 |
200,000 |
441,000 |
5,000 |
10,000 |
900 |
Note: Other sizes can be customized according to the requirements.
Key Features
- Marine Grade Reinforced PVC Structural Integrity: Built from high-strength PVC-coated polyester fabric specifically formulated for marine salvage environments. This composite structure provides exceptional tensile strength and airtight performance while resisting saltwater corrosion, hydrocarbon exposure, and biological fouling.
- Controlled Buoyancy Adjustment for Precision Lifting: Ability to provide precise buoyancy control through regulated internal air pressure, allowing smooth lifting of submerged objects without sudden displacement.
- Excellent Flexibility and Surface Conformity: Adapts naturally to irregular hull shapes, seabed contours, and structural geometries, improving load distribution and reducing point loading.
- Long Service Life with Low Maintenance Requirements: Strong resistance to UV radiation, seawater exposure, temperature fluctuations, and mechanical wear, contributing to overall operational cost savings.
Applications
- Submerged Vessel Recovery and Salvage: Commonly used for recovering sunken tugboats, barges, fishing vessels, and small ships while protecting hull integrity and ensuring operational safety.
- Offshore Equipment Installation and Retrieval: Assist with positioning subsea modules, lifting anchors, and recovering installation components in offshore oil, gas, and renewable energy projects.
- Harbor Cleaning and Underwater Obstruction Removal: Provide practical solutions for removing submerged debris, containers, or damaged infrastructure in port environments.
Why Choose Hongruntong Marine
- Strong Focus on Marine Salvage Technology: Concentrates on developing buoyancy solutions specifically for underwater engineering and salvage operations with real operational conditions in mind.
- Strict Material Selection and Production Standards: Uses carefully selected PVC fabrics and reinforcement materials manufactured under rigorous quality control procedures.
- Flexible Customization Capabilities: Offers customized engineering support to match specific project requirements for optimal lifting efficiency and operational safety.
- Reliable Technical Support Throughout Product Lifecycle: Provides ongoing technical assistance including operational guidance, maintenance recommendations, and troubleshooting support.
Frequently Asked Questions
What sizes of PVC inflatable air bags are available?
Sizes range from compact diver-handled units to large-volume air bags capable of providing substantial buoyancy. Custom dimensions can be produced according to project requirements.
How many times can the air bags be reused?
With proper maintenance, they can be reused multiple times. Lifespan depends on operational conditions, handling practices, and storage quality.
Is special training required for operation?
Basic diver training and familiarity with buoyancy control systems are recommended. Manufacturers usually provide operational guidelines and safety instructions.
How should air bags be stored after use?
They should be rinsed with fresh water, dried thoroughly, inspected for damage, and stored in a cool, dry environment away from direct sunlight.
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