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.
| Product Name | Heavy Duty Inflatable Air Bags |
|---|---|
| Raw Material | Top-Notch PVC Coating Fabric |
| Type | Parachute |
| Size | 500kg, 1000kg, 5000kg, 10000kg, etc |
| Thickness | 0.4-1.2mm, or as request |
| Color | Yellow, Blue, Black, etc |
| Density | 0.33-0.9g/cm3 |
| Safety Factor | 7:1 |
| Accessories | Valve, Inflatable Tube, Repair Material |
| OEM | Welcome |
| Warranty | 3 Years |
| Tolerances | +/- 0.03 on densities +/- 0.2 mm on thickness +/- 0 to +3mm on width +/- 0 to +3mm on length |
| Model | Lifting Capacity | Dimensions | Approx. Weight |
|---|---|---|---|
| HM-P01 | 200 kg (441 lbs) | 800 mm | 5 kg |
| HM-P02 | 500 kg (1,103 lbs) | 1,000 mm | 8 kg |
| HM-P03 | 1,000 kg (2,205 lbs) | 1,300 mm | 11 kg |
| HM-P04 | 2,000 kg (4,410 lbs) | 1,600 mm | 20 kg |
| HM-P05 | 4,000 kg (8,820 lbs) | 2,000 mm | 50 kg |
| HM-P06 | 6,000 kg (13,230 lbs) | 2,300 mm | 66 kg |
| HM-P07 | 8,000 kg (17,640 lbs) | 2,500 mm | 75 kg |
| HM-P08 | 10,000 kg (22,050 lbs) | 2,700 mm | 80 kg |
| HM-P09 | 15,000 kg (33,075 lbs) | 3,100 mm | 110 kg |
| HM-P10 | 20,000 kg (44,100 lbs) | 3,400 mm | 130 kg |
| HM-P11 | 30,000 kg (66,150 lbs) | 3,900 mm | 170 kg |
| HM-P12 | 50,000 kg (110,250 lbs) | 4,600 mm | 220 kg |
| HM-P13 | 70,000 kg (154,350 lbs) | 5,200 mm | 310 kg |
| HM-P14 | 100,000 kg (220,500 lbs) | 5,800 mm | 450 kg |
| HM-P15 | 150,000 kg (330,750 lbs) | 6,600 mm | 660 kg |
| HM-P16 | 200,000 kg (441,000 lbs) | 7,300 mm | 900 kg |
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.
The lift bag can recover a wide range of submerged objects, including anchors, machinery, pipelines, vessel components, containers, offshore equipment, and construction materials.
Yes. The stable parachute structure provides controlled buoyancy and improved lifting stability. However, project conditions such as current speed and water depth should be evaluated before operation.
Hongruntong Marine performs strict internal quality inspections, including material testing, seam inspection, inflation testing, and structural evaluation. Additional certification requirements can be discussed according to customer needs.
After operation, the lift bag should be rinsed with fresh water, fully dried, inspected for damage, and stored in a dry location away from direct sunlight and sharp objects.
Yes. Customized accessories such as valves, lifting straps, shackles, ropes, protective covers, and connection systems can be supplied according to customer requirements.
