Reinforced Fabric Underwater Lift Bag with Fast Inflation and Superior Buoyancy

Hongruntong Marine Parachute Underwater Lift Bag is a professional underwater lifting and buoyancy control solution designed for marine salvage, offshore engineering, underwater construction, and commercial diving applications. Developed for operations requiring accurate load control and dependable lifting performance, this product provides an efficient method for recovering submerged objects, supporting underwater installation tasks, and improving safety during complex marine operations.

The lift bag adopts a parachute-type open-bottom design that delivers excellent buoyancy efficiency while maintaining controlled ascent performance. As the lift bag rises through different water depths, excess air can escape naturally through the open-bottom structure, reducing the possibility of over-expansion and allowing operators to maintain stable lifting control. This feature makes the product particularly suitable for deep-water recovery, offshore maintenance, and underwater projects where precision and safety are essential.

Manufactured from high-strength PVC-coated polyester fabric, Hongruntong Marine Parachute Underwater Lift Bag provides excellent resistance to abrasion, tearing, seawater corrosion, UV radiation, and harsh marine conditions. The advanced material structure ensures reliable performance during repeated underwater operations while maintaining flexibility for transportation, deployment, and storage.

A marine salvage company operating along the Mediterranean coastline faced a challenging recovery project after a severe storm caused a small commercial vessel to sink near a busy fishing harbor. The 1,200 DWT cargo vessel settled on the seabed at a depth of approximately 18 meters, blocking part of the navigation area and affecting normal harbor operations.

After evaluating the recovery requirements, the contractor selected Hongruntong Marine Parachute Underwater Lift Bags as the primary lifting solution. Divers installed multiple lift bags around key structural points to create balanced buoyancy during recovery.

The lift bags were gradually inflated according to the calculated lifting plan. The parachute-type design provided stable upward force while maintaining good control of the vessel's movement. As the vessel began rising from the seabed, the open-bottom structure automatically released excess air, preventing sudden buoyancy changes and allowing the salvage team to maintain accurate control.

The vessel was successfully lifted to a safe position where additional recovery equipment could complete the operation. The entire process was completed without requiring a large crane vessel, significantly reducing project costs and shortening the harbor closure period.

Tolerances: +/- 0.03 on densities, +/- 0.2 mm on thickness, +/- 0 to +3mm on width, +/- 0 to +3mm on length

*Note: Other sizes can be customized according to the requirements.

• Coastal Salvage and Emergency Recovery: Recovering damaged vessels, sunken equipment, anchors, containers, and other underwater objects
• Offshore Engineering and Subsea Maintenance: Equipment positioning, pipeline maintenance, subsea structure adjustment, and underwater installation projects
• Diving Operations and Underwater Construction: Underwater inspections, vessel maintenance, component handling, and construction support tasks

• Comprehensive Experience: Extensive experience in designing and manufacturing marine equipment for underwater operations
• Advanced Manufacturing Technology: Advanced production techniques and strict quality control systems throughout manufacturing
• Professional Customization: Flexible customization services and engineering support to satisfy different customer requirements
• Reliable International Service: Professional communication, technical consultation, and long-term partnership support