Heavy Duty Lift Bag with High Load Capacity Abrasion Resistant and Easy Deployment for Underwater Operations

Hongruntong Marine Parachute Underwater Lift Bag is a professional underwater lifting solution developed for subsea recovery, offshore renewable energy projects, marine construction, and commercial diving operations. Designed to provide controlled buoyancy and reliable lifting force, this equipment enables operators to safely move, recover, and position submerged objects in complex underwater environments where traditional lifting methods may be difficult or costly to implement.

The product adopts an open-bottom parachute structure that provides excellent buoyancy efficiency and stable lifting performance. During underwater ascent, the design allows expanding air to escape naturally, reducing the risk of excessive internal pressure while maintaining smooth upward movement. This self-adjusting function improves operational control and makes the lift bag particularly suitable for deep-water applications, offshore maintenance projects, and precision underwater recovery operations.

During the installation phase of an offshore wind farm project in Northern Europe, a construction contractor experienced an unexpected underwater recovery challenge. A hydraulic positioning module weighing approximately 3.8 tons fell from a working platform during subsea foundation preparation and settled near the seabed at a depth of 36 meters.

A professional diving team installed multiple lift bags around the hydraulic module according to the calculated buoyancy requirements. The bags were gradually inflated using controlled air supply, allowing the equipment to separate smoothly from the seabed. The parachute-style design provided excellent stability throughout the lifting process, preventing sudden movement caused by underwater currents.

The entire recovery operation was completed within the planned maintenance window without requiring additional crane vessel support. The contractor reduced project expenses by avoiding extended vessel rental costs and minimized downtime during the offshore construction schedule.

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

• Optimized Parachute Structure: Provides stable underwater buoyancy with controlled air retention and automatic pressure adjustment
• Heavy-Duty Material Construction: Premium PVC-coated polyester fabric with excellent tensile strength and resistance to abrasion, seawater, and UV exposure
• Reinforced Lifting System: Integrated webbing straps and heavy-duty lifting points for secure load handling and even force distribution
• Custom Design Capability: Available in customized sizes, buoyancy capacities, and configurations for specialized underwater operations

• Offshore Renewable Energy Construction: Subsea equipment recovery, foundation support, cable installation assistance
• Marine Salvage and Recovery Operations: Recovery of submerged vessels, anchors, containers, and machinery
• Commercial Diving and Subsea Engineering: Underwater inspection, equipment relocation, pipeline maintenance, and ship repair

• Experienced Marine Engineering Manufacturer: Extensive experience in developing marine lifting equipment for global customers
• Strict Quality Management System: Comprehensive testing including material strength, seam quality, and buoyancy performance
• Professional Customization Service: Technical team provides recommendations for optimal configurations
• Reliable Global Customer Support: Complete support from consultation to after-sales service