Underwater Air Lift Bags with High Buoyancy Corrosion Resistant Safe Automatic Pressure Relief for Marine Salvage
The cylindrical Underwater Air Lift Bag is a highly efficient marine buoyancy solution designed for controlled lifting, launching, and salvage operations. Manufactured using high-strength synthetic fiber fabric combined with multi-layer polymer coating, the bag delivers outstanding resistance to abrasion, seawater corrosion, and UV exposure. Its cylindrical structure ensures balanced load distribution and stable vertical lifting performance.
Available in capacities ranging from small-scale operations to heavy-duty industrial applications, the bag is equipped with reinforced lifting straps, safety valves, and optimized air inlet systems. These features allow precise buoyancy control and enhanced operational safety even in dynamic underwater conditions.
This product is widely applied in ship launching, underwater recovery, offshore construction, and emergency lifting operations. It significantly reduces reliance on heavy machinery, improves efficiency, and lowers operational costs while ensuring high safety standards.
A coastal shipyard in Indonesia required an efficient solution to launch 800-1,500 ton cargo vessels without investing in permanent slipway infrastructure. Environmental conditions included uneven seabed and limited working space.
Hongruntong cylindrical air lift bags were deployed beneath the vessel hull. Through controlled inflation, the vessel was lifted and smoothly transferred into water. The operation was completed with reduced manpower and no structural stress damage.
Compared to traditional launching systems, the project achieved a 25% cost reduction and improved operational flexibility. The bags were reused across multiple launches, and the client reported consistent performance and minimal maintenance requirements, demonstrating strong reliability.
| Product Name | Underwater Air Lift Bags |
| Raw Material | Superior PVC Coating Fabric |
| Type | Cylindrical |
| Size | 500kg, 1000kg, 5000kg, 10000kg, etc |
| Thickness | 0.4mm-2.5mm, 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 | Buoyancy (kg) | Buoyancy (lbs) | Diameter (mm) | Length (mm) | Appr. 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 |
- High Load Capacity with Optimized Structural Stability: The cylindrical geometry ensures even load distribution across the surface, minimizing localized stress and improving lifting efficiency. Each bag is engineered to handle heavy loads under dynamic marine conditions.
- Enhanced Abrasion and Tear Resistance: The outer layer is constructed from industrial-grade coated fabric with superior resistance to friction, impact, and puncture, allowing the bag to withstand rough seabeds and repeated use.
- Precision Air Control and Safety Mechanism: Equipped with advanced air valves and automatic pressure relief systems to prevent over-inflation and ensure stable buoyancy control with reduced risk.
- Lightweight Design with Easy Handling: Despite high load capacity, the bag remains lightweight and flexible, enabling quick deployment, retrieval, and storage for improved operational efficiency.
- Ship Launching and Dock Operations: Provides a flexible and cost-effective alternative to traditional slipways for vessel launching and repositioning.
- Underwater Salvage and Recovery: Enables safe lifting of sunken ships, pipelines, or heavy equipment with controlled buoyancy.
- Offshore Construction Support: Assists in installation and positioning of marine structures such as pipelines and caissons.
- Proven Engineering Expertise: Extensive experience in designing and manufacturing buoyancy systems for complex marine environments.
- Custom Manufacturing: Products can be tailored in size, lifting capacity, and material specifications to meet specific operational requirements.
- High-Quality Materials and Strict Testing: Each air lift bag undergoes rigorous testing, including pressure, load, and durability assessments.
- Comprehensive Technical Support: Full support from product selection to operation guidance, ensuring optimal performance and long service life.
- What sizes are available? Standard capacities range from 1 ton to 200 tons, with customization options.
- Can the bags be reused? Yes, they are designed for multiple reuse cycles with proper maintenance.
- How is safety ensured? Built-in pressure relief valves prevent over-inflation and structural damage.
- Are certifications available? Yes, ISO and third-party inspection reports can be provided.
- How should the bags be stored? Store in a dry, shaded area away from sharp objects.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.