Inflatable Lift Bags UV Resistant Eco Friendly Material Saltwater Resistant Long

Buoyancy Bags are advanced inflatable lifting devices engineered to provide precise, reliable, and controlled underwater lifting solutions. They are designed for a broad range of subsea operations, including salvage, recovery, construction, and offshore maintenance. Manufactured using high-strength synthetic fabrics coated with elastomeric polymers, these bags deliver exceptional performance in terms of tensile strength, puncture resistance, and long-term air retention.

Each unit features reinforced lifting points, automatic pressure relief valves, and corrosion-resistant fittings to ensure maximum safety and operational reliability. The open-bottom design allows for self-regulating air release during ascent, preventing sudden pressure buildup and ensuring a smooth, controlled lift. This makes them particularly suited for use in deep-water conditions, where stability and gradual buoyancy are essential for safe operations.

The lightweight and compact structure of Buoyancy Bags allows divers to handle, position, and deploy them quickly even in limited underwater space. Their modular design also enables operators to connect multiple bags for larger or irregularly shaped loads, providing a scalable lifting solution adaptable to a wide range of project requirements.

The bags can be used in various lifting modes — vertical, horizontal, or inclined — depending on load geometry and environmental conditions. Advanced material bonding and double-seam w

elding ensure airtight performance and superior structural integrity, even under fluctuating underwater pressures.

Buoyancy Bags are compatible with compressed air, nitrogen, or other inert gases, offering operational flexibility and safety. The inflation and deflation valves are designed for compatibility with standard diving equipment, ensuring ease of integration into existing offshore lifting systems.

The combination of structural resilience, precise control, and ease of use has made Buoyancy Bags one of the most trusted lifting tools in the subsea engineering sector. Whether supporting pipeline installation, salvaging marine structures, or recovering valuable underwater assets, these bags deliver consistent, repeatable, and safe results.

Case Study: Offshore Wind Turbine Foundation Maintenance

In 2024, a major renewable energy contractor required a solution for lifting and repositioning a subsea transition piece that had settled unevenly during offshore wind turbine installation. The structure weighed approximately 12 tons and was located 22 meters underwater in a strong current area. Traditional crane lifts risked disturbing the seabed and causing misalignment of the foundation bolts.

Hongruntong Marine supplied Buoyancy Bags designed specifically for controlled vertical lift and precise orientation control. Eight lifting units with 1.5-ton capacity each were attached evenly along the structure’s perimeter using high-strength slings and certified shackles.

Divers connected the inflation hoses from the surface manifold system, allowing operators to inflate the bags in a synchronized manner. The lift process was continuously monitored via subsea cameras and pressure gauges.

The open-bottom venting system allowed excess air to escape naturally as the pressure differential changed, resulting in a perfectly balanced and gradual ascent. The transition piece was repositioned within a tolerance of less than 10 millimeters, well within engineering limits.

The project was completed 30% faster than the initial schedule, with zero incidents or structural damage. Following the success of this project, the contractor standardized Hongruntong Marine’s Buoyancy Bags for all subsequent offshore maintenance campaigns.

Controlled Lift with Self Regulating Air Release
Buoyancy Bags utilize a precision-engineered open-bottom venting system that allows excess air to discharge automatically during ascent. This provides stable, predictable, and safe lifting performance, even in variable pressure environments.

High Strength Fabric and Reinforced Seams
Each bag is constructed from multi-layer nylon or polyester fabric coated with neoprene or polyurethane, ensuring exceptional resistance to tearing, abrasion, and UV degradation. Reinforced lifting eyes and double-seam welding provide unmatched durability and fatigue resistance during repeated use.

Corrosion Resistant and Diver Friendly Components
All metal fittings, valves, and shackles are manufactured from marine-grade stainless steel or brass. The inflation valves are designed for compatibility with standard diving air hoses, ensuring easy underwater operation and minimal maintenance requirements.

Compact, Lightweight, and Portable Design
When deflated, Buoyancy Bags fold into a compact shape for convenient storage and transport. Their light weight reduces deployment effort, while rapid inflation capability enables fast readiness in field operations, even under time-sensitive conditions.

Precision Monitoring and Control
Optional features include pressure gauges, relief valves, and inflation manifolds for synchronized multi-bag operation. This enables operators to achieve precise load balance, ideal for lifting fragile or irregular objects.

Long Service Life and Reusability
Engineered for repeated deployment cycles, the bags retain air-tight performance through hundreds of uses. Proper maintenance—cleaning, drying, and inspection—can extend operational life well beyond five years under typical offshore use.

Applications

Marine Salvage and Recovery Operations
Buoyancy Bags are extensively used in ship, boat, and barge recovery where stability and controlled ascent are critical. Their self-regulating air release minimizes the risk of rapid rise or rollover, ensuring diver and equipment safety.

Pipeline and Cable Installation
The bags offer stable lift and precise maneuverability during pipeline laying, repositioning, or maintenance. Controlled buoyancy prevents excessive tension or bending, ensuring smooth alignment with seabed structures.

Offshore Construction and Maintenance
Ideal for handling subsea frames, foundations, and components during installation or inspection. The ability to maintain steady lift in strong currents makes them valuable in deep-sea infrastructure work.

Equipment Deployment and Retrieval
Buoyancy Bags are frequently used for deploying underwater sensors, instruments, and structures. They provide both temporary and permanent support until objects are secured in position.

Emergency Response and Rescue
Rapid-deploy Buoyancy Bags can lift sunken vehicles, cargo containers, or submerged infrastructure in accident recovery scenarios, helping reduce downtime and material loss.

Why Choose Hongruntong Marine

Proven Design and Engineering Expertise
Hongruntong Marine combines advanced engineering with field-tested experience to design Buoyancy Bags optimized for performance, safety, and reliability. Each unit undergoes hydrostatic pressure, seam strength, and load tests to guarantee quality and endurance in real-world conditions.

Premium Materials and Precision Manufacturing
Every Buoyancy Bag is produced in ISO-certified facilities using marine-grade rubberized fabrics and precision welding technology. Material batches are traceable, ensuring consistent quality and compliance with IMCA D-016 standards.

Tailored Solutions for Specialized Operations
Hongruntong Marine provides custom Buoyancy Bags in various capacities—from 100 kg to 50 tons—to suit different underwater tasks. Clients can specify lifting eye positions, fabric thickness, and valve configurations to match operational needs.

Global Support and After Sales Service
With a network of service partners and technical consultants, Hongruntong Marine offers comprehensive support, including operational guidance, on-site training, and spare part availability. Our worldwide logistics ensure timely delivery and continued operational readiness.

Commitment to Safety and Innovation
Safety is integrated into every design stage. All Buoyancy Bags include redundant safety valves and load-rated attachment points. Ongoing R&D focuses on enhanced fabric coatings, digital pressure monitoring, and eco-friendly materials to reduce environmental impact while improving performance.

Trusted by Industry Leaders
Hongruntong Marine is a preferred supplier for international offshore, salvage, and construction contractors. Our proven track record, combined with reliable technical documentation and global certifications, reinforces client confidence in every product we deliver.

FAQ

Q1: What lifting capacities are available?
A: Standard Buoyancy Bags range from 200 kg to 50 tons, with custom models available upon request.

Q2: What gases can be used for inflation?
A: Compressed air is standard; nitrogen or inert gases may be used in specialized environments.

Q3: How do I ensure balanced lift during operation?
A: Use multiple bags with synchronized inflation manifolds, maintain equal pressure, and monitor load distribution via gauges or sensors.

Q4: How should the bags be maintained after use?
A: Rinse with fresh water, inspect for abrasions or punctures, dry completely, and store in a cool, ventilated space away from direct sunlight.

Q5: Are training or field services available?
A: Yes. Hongruntong Marine offers on-site setup training, technical consultation, and operational safety workshops for all clients.