Buoyancy Bags High Lift Strength Tear Resistant Long Service Life

Pillow Type Underwater Lift Bags are enclosed buoyancy lifting devices specifically designed for stable underwater lifting operations. Their flat, pillow-shaped structure allows the bag to sit firmly on the seabed while generating strong and evenly distributed buoyancy during inflation. This structural design makes pillow lift bags particularly effective for lifting objects that are resting on the seabed or partially buried in sediment.

Hongruntong Marine Pillow Type Underwater Lift Bags are constructed from heavy-duty PVC coated polyester fabric combined with multi-layer reinforcement technology. The fabric is engineered to withstand harsh marine conditions including saltwater corrosion, mechanical abrasion, and UV exposure. The internal load-bearing webbing network distributes lifting forces evenly across the bag body, preventing localized stress and ensuring reliable structural stability during lifting operations.

During a port expansion project, a construction contractor accidentally dropped a large steel fabrication frame into the water while transferring equipment from a barge to the dock. The steel structure weighed approximately 9 tons and sank to the harbor seabed at a depth of about 8 meters.

Due to the limited maneuvering space in the harbor and the difficulty of deploying large cranes near the structure, the project engineers decided to use Hongruntong Marine Pillow Type Underwater Lift Bags for the recovery operation. Divers first inspected the submerged structure and identified several secure rigging points where lifting straps could be attached.

Two pillow lift bags with lifting capacities of 5 tons each were positioned beneath the steel frame. Their flat design allowed them to rest securely on the seabed while supporting the weight of the structure during inflation. Additional slings were installed to stabilize the load and ensure balanced lifting.

Compressed air was slowly introduced into the lift bags through surface-controlled air hoses. As the bags expanded, they generated sufficient buoyant force to gradually lift the steel frame off the seabed. The divers carefully monitored the lifting process and adjusted the air supply to maintain stability.

Within approximately 40 minutes, the structure was lifted high enough to be secured with a dockside crane and safely transferred back onto the construction platform. The recovery operation was completed without damage to the structure or interruption to the construction schedule.

The contractor reported that the Hongruntong pillow lift bags provided excellent stability and lifting control. Their compact design and easy handling significantly simplified the recovery operation compared with conventional lifting equipment.

• Stable Seabed Support Structure: The pillow shape design allows the lift bag to remain stable when placed on the seabed, generating even buoyant force across the flat surface area to support heavy loads resting on the bottom.
• Reinforced Multi Layer Fabric Construction: Manufactured using high strength PVC coated polyester fabric with multi-layer reinforcement technology and high frequency welding for strong, airtight seams.
• Reliable Buoyancy Performance: Fully enclosed design ensures consistent buoyancy during lifting operations, allowing divers to carefully control the lifting process.
• Compact and Easy Handling: Relatively compact design allows for efficient transport and storage, with quick positioning and rigging capabilities during operations.

• Harbor and Port Construction: Used to lift submerged construction materials or reposition structural components that have settled on the seabed.
• Underwater Equipment Recovery: Effective solution for recovering tools, machinery, or construction components that have fallen into the water.
• Marine Infrastructure Maintenance: Allows maintenance teams to carefully raise submerged components for inspection or repair without large surface cranes.

• Focus on Practical Marine Engineering Solutions: Designs lifting equipment specifically for real-world marine working conditions with practical, durable, and reliable products.
• Reliable Manufacturing Technology: Advanced production equipment and high frequency welding technology ensure strong seams and airtight construction with precise quality control.
• Wide Product Range: Comprehensive range of marine buoyancy products including pillow lift bags, open bottom lift bags, salvage bags, and inflatable buoyancy systems.
• Long Term Customer Support: Ongoing technical support including guidance on lifting calculations, rigging configurations, and maintenance procedures.