Professional Underwater Lift Bag with 200kg to 50 Tons Lifting Capacity, Outstanding PVC Coating Fabric, and IMCA-D-016 Standard

Heavy Duty Lift Bag High Load Capacity Abrasion Resistant Easy Deployment

Hongruntong Marine Parachute Underwater Lift Bag is a specialized underwater lifting device designed for marine salvage, offshore engineering, ship maintenance, and professional diving operations. Developed to provide controlled buoyancy assistance in challenging underwater environments, this product enables safe recovery, repositioning, and transportation of submerged objects while reducing dependence on large mechanical lifting equipment.

Featuring an open-bottom parachute design, the lift bag delivers excellent buoyancy stability and efficient lifting performance. When filled with compressed air underwater, the bag generates upward lifting force while allowing excess air to escape naturally during ascent. This pressure-balancing mechanism prevents uncontrolled expansion, improves lifting accuracy, and provides smoother movement when handling heavy or sensitive underwater loads.

Hongruntong Marine Parachute Underwater Lift Bag is manufactured using high-strength PVC-coated polyester fabric, which provides excellent resistance to abrasion, impact, seawater corrosion, UV exposure, and environmental aging. The durable material structure allows the product to withstand repeated deployment in demanding marine conditions while maintaining flexibility for easy transportation and operation.

A port construction company operating in Southeast Asia encountered an unexpected challenge during the expansion of a commercial harbor. A large hydraulic crane attachment weighing approximately 5.5 tons accidentally fell into the water during equipment transfer operations. The component sank near the harbor construction area at a depth of 22 meters, creating a potential safety risk and affecting scheduled construction activities.

The company initially considered using a floating crane for recovery; however, the mobilization process required several days and would significantly increase project costs. Because the recovery location was close to active construction zones, the contractor needed a compact and flexible underwater lifting solution that could be deployed quickly.

After reviewing the project conditions, the engineering team selected Hongruntong Marine Parachute Underwater Lift Bags for the recovery operation. Professional divers installed multiple lift bags around the crane component and calculated the required buoyancy distribution to ensure stable lifting.

During inflation, the lift bags gradually increased lifting force while maintaining excellent balance. The parachute-style structure provided stable upward movement, preventing sudden rotation or uncontrolled shifting of the heavy component. The open-bottom design automatically adjusted internal air pressure as the load moved upward, allowing divers to maintain precise control throughout the recovery process.

The damaged crane component was successfully lifted and transferred onto a recovery barge within the planned working period. The contractor avoided the need for expensive crane vessel support and reduced recovery costs by approximately 45%. The rapid deployment of the lift bags also helped minimize disruption to ongoing harbor construction activities.

Following the successful operation, the customer confirmed that the lift bags demonstrated excellent durability and reliability after multiple underwater adjustments. The company later purchased additional Hongruntong Marine Parachute Underwater Lift Bags for future harbor maintenance, equipment recovery, and emergency response applications.

Hongruntong Marine Parachute Underwater Lift Bag is designed to provide powerful and stable buoyancy performance for professional underwater recovery operations. The parachute-style structure maximizes lifting efficiency by allowing the bag to capture and maintain lifting air effectively while minimizing unnecessary material weight.

The optimized shape provides excellent vertical lifting force and improves stability during ascent. This is especially important when recovering heavy equipment, submerged machinery, anchors, or structural components where uncontrolled movement could create safety risks or additional damage.

The lift bag can be deployed individually for smaller lifting tasks or combined with multiple units to create customized lifting systems for larger underwater objects. This flexibility allows operators to adjust lifting capacity according to specific project requirements.

By providing reliable buoyancy without requiring large mechanical equipment, Hongruntong Marine lift bags help contractors improve operational efficiency and reduce the complexity of underwater recovery projects.

The durability of an underwater lift bag directly affects operational reliability and maintenance costs. Hongruntong Marine uses premium PVC-coated polyester fabric specifically developed for marine applications where strength, flexibility, and environmental resistance are essential.

The high-strength fabric provides excellent protection against abrasion caused by contact with rocks, steel structures, seabed materials, and underwater equipment. Its resistance to seawater, sunlight, and aging allows the lift bag to maintain performance even during long-term offshore operations.

The manufacturing process includes advanced welding technology that creates strong, airtight seams. This improves leak resistance and ensures stable buoyancy during extended lifting operations. Compared with traditional construction methods, welded seams provide better durability and reduce maintenance requirements.

This reliable material structure allows customers to use the lift bags repeatedly while maintaining consistent lifting performance.

Safety is a critical factor in underwater lifting. Hongruntong Marine Parachute Underwater Lift Bag incorporates multiple safety-oriented design features to support reliable operation in demanding conditions.

The reinforced lifting straps and connection points are engineered to distribute loads evenly, preventing excessive stress on individual areas of the bag. This improves stability and reduces the risk of structural damage during heavy lifting operations.

Optional safety components, including pressure relief systems, protective covers, and customized lifting accessories, are available to meet different project requirements. These features allow contractors to adapt the lift bags for specialized underwater environments.

Through careful engineering and strict manufacturing control, Hongruntong Marine ensures that every lift bag provides dependable performance and improved operational safety.

Underwater lifting projects vary significantly depending on load type, water depth, environmental conditions, and operational methods. Hongruntong Marine provides customized Parachute Underwater Lift Bag solutions to meet these different requirements.

Customers can select specific buoyancy capacities, dimensions, colors, lifting arrangements, inflation systems, and additional protective features. Special designs can also be developed for offshore platforms, shipyards, salvage vessels, and industrial applications.

The engineering team provides technical support throughout the customization process, helping customers choose suitable configurations that improve lifting efficiency and reduce operational risks.

This flexible approach enables Hongruntong Marine to support a wide range of underwater projects with tailored solutions rather than standard products only.

• Port Construction and Harbor Maintenance: Parachute Underwater Lift Bags are widely used in harbor construction projects for recovering submerged equipment, lifting construction components, and supporting underwater maintenance activities. Their compact design allows efficient operation in restricted working areas.
• Shipyard Repair and Vessel Maintenance: Shipyards use lift bags for underwater component handling, propeller replacement, anchor recovery, and vessel repair operations. The equipment helps improve workflow efficiency while reducing reliance on heavy lifting machinery.
• Offshore Oil and Gas Operations: In offshore oil and gas projects, lift bags assist with subsea equipment recovery, temporary buoyancy support, pipeline installation, and underwater inspection tasks where reliable lifting performance is essential.

• Professional Experience in Marine Equipment Manufacturing: Hongruntong Marine has extensive experience in producing professional marine equipment for underwater operations, offshore engineering, and industrial applications. Our knowledge of real-world project requirements enables us to develop products that provide reliable performance under challenging conditions.
• Reliable Quality Control and Testing Procedures: Quality reliability is one of Hongruntong Marine's core advantages. Every Parachute Underwater Lift Bag undergoes strict inspection procedures throughout manufacturing, from raw material selection to final product testing.
• Engineering Support and Customized Solutions: Hongruntong Marine provides more than standard manufacturing services. Our technical team works closely with customers to develop suitable lifting solutions based on project requirements.
• Efficient Global Service and Customer Partnership: Hongruntong Marine serves customers worldwide with professional export experience and reliable service support. Our team provides assistance from product consultation and technical communication to production updates and delivery coordination.