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Pillow Type Underwater Lift Bags are professional buoyancy lifting devices designed to provide stable lifting support for submerged loads during marine operations. Unlike open-bottom lift bags, pillow lift bags are completely enclosed structures that maintain a flat and stable profile underwater, making them particularly suitable for lifting objects resting on the seabed or in shallow water environments.

Hongruntong Marine Pillow Type Underwater Lift Bags are manufactured using high-strength PVC coated polyester fabric combined with internal reinforced webbing structures. This design ensures excellent load distribution and prevents deformation during lifting operations. The sealed buoyancy chamber allows the bag to maintain consistent lifting force once inflated, improving stability when raising heavy equipment or marine structures.

The lift bags are equipped with reinforced lifting rings and strong webbing straps that provide secure attachment points for rigging systems. Corrosion-resistant metal fittings ensure reliable performance in harsh marine environments including saltwater exposure and offshore conditions.

During an offshore pipeline installation project, a marine engineering contractor needed a reliable solution to assist with lifting and positioning several large steel pipeline sections weighing approximately 12 tons each. The pipeline segments were stored on the seabed prior to installation and needed to be lifted slightly to allow alignment and connection during the construction process.

The engineering team selected Hongruntong Marine Pillow Type Underwater Lift Bags because their stable flat design allowed them to sit securely on the seabed without rolling or shifting during inflation. Divers positioned multiple pillow lift bags beneath each pipeline segment using lifting straps and rigging systems.

Compressed air from surface compressors was gradually supplied to the lift bags through inflation hoses. As the bags expanded, they created sufficient buoyancy to gently lift the pipeline sections off the seabed. This allowed the installation crew to maneuver the pipes into the correct alignment position for welding and final installation.

The flat pillow structure ensured stable lifting and prevented sudden movement of the heavy pipeline sections. The operation was completed efficiently with minimal equipment requirements and significantly reduced crane usage.

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

• Stable Pillow Structure Design: Fully enclosed rectangular or square structure provides excellent stability during lifting operations, preventing rolling or drifting during inflation.
• Reinforced Load Distribution System: Internal load-bearing webbing networks distribute lifting force evenly throughout the bag body, preventing stress concentration.
• Heavy Duty Marine Fabric Construction: High-strength PVC coated polyester fabric offers outstanding resistance to abrasion, punctures, tearing, saltwater corrosion, and UV radiation.
• Easy Deployment and Controlled Inflation: Designed for convenient underwater deployment with durable inflation valves compatible with standard diving air cylinders and air compressor systems.

• Underwater Pipeline and Structure Installation: Assist with pipeline positioning and installation in offshore construction projects.
• Shipyard Equipment Handling: Provide lifting assistance during repositioning or recovery operations for heavy marine equipment.
• Marine Salvage and Recovery: Raise submerged equipment, containers, or small vessels resting on the seabed with balanced load distribution.

• Specialized Marine Buoyancy Equipment Manufacturer: Years of manufacturing experience delivering reliable performance under demanding underwater conditions.
• High Quality Materials and Manufacturing: Carefully selected industrial materials with advanced welding and manufacturing techniques for maximum strength and long service life.
• Flexible Customization Solutions: Wide range of customization options for lifting capacities, dimensions, attachment configurations, and valve systems.
• Reliable Service and Technical Support: Professional technical support with detailed documentation and maintenance recommendations.

• What is the difference between pillow lift bags and open bottom lift bags?
  Pillow lift bags are fully enclosed and maintain a flat shape underwater, providing excellent stability when lifting objects resting on the seabed. Open bottom lift bags are typically used for vertical lifting and diver-controlled buoyancy adjustments.
• What lifting capacities are available for pillow underwater lift bags?
  Hongruntong Marine offers pillow lift bags in various capacities ranging from small units of a few hundred kilograms to large models capable of lifting multiple tons depending on operational requirements.
• Can pillow lift bags be reused multiple times?
  Yes. The bags are designed for repeated use in marine operations. Proper cleaning, inspection, and storage after each operation will help maintain their performance and extend service life.
• How are pillow lift bags inflated underwater?
  The bags can be inflated using compressed air from diving cylinders or air compressors. Divers control the air supply through valves to gradually increase buoyancy during the lifting process.
• Are pillow lift bags suitable for offshore construction projects?
  Yes. Their stable structure and controlled buoyancy make them widely used in offshore construction tasks such as pipeline installation, equipment positioning, and underwater structural support.