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High Tensile Strength Leak Proof Durable Underwater Lift Bags for Marine Salvage

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High Tensile Strength Leak Proof Durable Underwater Lift Bags for Marine Salvage
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Features
Specifications
Material: TOP-Grade PVC Coating Fabric
Reinforcement: Nylon Fabric
Lifting Capacity: 200kg To 50 Tons
Type: Cylindrical, Parachute, Pillow
Feature: Durable And Reliable Construction
Layers: 1-6Ply, Or As Request
Thickness: 0.4mm-2.5mm, Or As Request
Valve: Inflation And Pressure Release
Color: Black, Yellow, Orange, Or As Request
Packaging: Pallets, Wooden Box
Usage: Underwater Air Lifting, Salvage, Large Buoyancy
Standard: IMCA-D-016
Certificate: BV, ABS, DNV, LR, SGS, CCS
OEM: Warmly Welcomed
Warranty: 36 Months
Application: Salvage Operations, Underwater Construction
Highlight:

High Tensile Strength Underwater Lift Bags

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Leak Proof Marine Salvage Bags

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Durable Pillow Underwater Air Lift Bags
Basic Infomation
Place of Origin: China
Brand Name: Hongruntong Marine
Certification: BV, ABS, DNV, LR, SGS, CCS, RMRS
Model Number: HM-AL6
Payment & Shipping Terms
Packaging Details: Wooden Pallets, Wooden Box
Delivery Time: 5-8 Work Days
Payment Terms: L/C,T/T,D/A,D/P,Western Union,
Supply Ability: 2100 Pcs Per Month
Product Description
Underwater Lift Bags High Tensile Strength Leak Proof Durable For Marine Salvage
Pillow Underwater Air Lift Bags are flexible inflatable buoyancy devices engineered for controlled underwater lifting, flotation assistance, subsea handling, marine salvage, vessel recovery and temporary support of submerged structures. The pillow configuration provides a broad buoyancy surface while maintaining a relatively low-profile geometry, allowing the equipment to be positioned beneath vessels, steel structures, pipelines, machinery and other submerged loads where rigid lifting equipment may be difficult to install.
By introducing controlled quantities of air into the enclosed lifting chamber, the bag displaces water and generates upward buoyant force, reducing the effective submerged weight of the supported object and facilitating controlled movement.
The main body is manufactured from high-strength PVC-coated polyester fabric, combining a reinforced textile substrate with a flexible polymer coating. The polyester reinforcement provides tensile strength and dimensional stability, while the PVC coating contributes to airtightness, abrasion resistance, moisture resistance and protection against normal marine exposure.
Case Study: Pillow Underwater Air Lift Bags for a 210-Ton Workboat Recovery in Southeast Asia
A marine salvage contractor operating in Southeast Asia successfully recovered a 210-ton steel workboat that had become partially submerged inside a protected coastal harbor. The vessel had settled unevenly on the seabed, creating difficult recovery conditions.
The contractor's engineering team developed a staged buoyancy recovery procedure using several Pillow Underwater Air Lift Bags installed at structurally suitable locations beneath the hull. The objective was to progressively reduce the vessel's seabed contact and restore sufficient flotation to allow controlled movement toward a deeper recovery position.
Divers conducted underwater inspections and positioned the bags beneath designated hull sections. Initial inflation was performed gradually, with the recovery team introducing air into selected units in stages and monitoring the vessel's response. As buoyancy increased, the stern gradually separated from the seabed, allowing surface winches to reposition the vessel toward deeper water.
The operation demonstrated the practical value of distributed inflatable buoyancy in constrained marine recovery environments, with the reusable lifting bags subsequently retained for future salvage projects.
Pillow Underwater Air Lift Bag in marine salvage operation Close-up view of underwater lift bag construction
Specifications
Product Name Pillow Shaped Underwater Air Lifting Bag For Subsea Search And Rescue
Raw Material TOP-Grade PVC Coating Fabric
Type Cylindrical, Parachute, Pillow
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 Specifications
Model Capacity (kg) Capacity (lbs) Length (mm) Width (mm)
HM-P100 100 220 1,020 760
HM-P250 250 550 1,320 820
HM-P500 500 1,100 1,300 1,200
HM-P1000 1,000 2,200 1,550 1,420
HM-P2000 2,000 4,400 1,950 1,780
HM-P3000 3,000 6,600 2,900 1,950
HM-P5000 5,000 11,000 3,230 2,030
Note: Other sizes can be customized according to requirements.
Features
High-Strength PVC Coated Polyester Fabric Construction
The fabric system forms the primary pressure-retaining and load-supporting structure. High-strength polyester reinforcement provides tensile framework for dimensional stability, while PVC coating provides airtight surface with resistance to water, abrasion and marine exposure. This combination allows flexibility for underwater positioning without sacrificing structural integrity during repeated lifting cycles.
Precision Welded Airtight Structure
Fabric sections are assembled using controlled welding technology suitable for PVC-coated technical fabrics. The welded joints create airtight connections between panels and provide structural continuity around the buoyancy chamber. This ensures stable internal air volume for predictable buoyancy characteristics during lifting operations.
Reinforced Load-Transfer and Lifting System
Reinforced lifting areas are integrated into the bag structure to distribute mechanical forces and reduce stress concentration. Multiple lifting points provide stable connections to sling arrangements, while reinforced webbing helps transfer load from fabric body into shackles and compatible hardware.
Controlled Inflation and Buoyancy Adjustment
The lifting bag incorporates an air-management system allowing progressive buoyancy introduction. Inflation valves provide connections for controlled air supply, enabling operators to adjust lifting force during different stages of underwater operations. This provides operational flexibility for professional underwater recovery and handling.
Applications
Marine Salvage and Vessel Recovery
Suitable for controlled buoyancy assistance during recovery of partially submerged vessels, workboats, barges and marine equipment. Multiple bags can be positioned beneath structurally suitable hull sections to reduce seabed contact and provide progressive flotation.
Subsea Construction and Equipment Handling
Provides temporary buoyancy for fabricated steel structures, equipment frames, pipeline components and other submerged loads. Flexible construction allows efficient transportation and positioning around structures with irregular geometry.
Shipyard, Port and Marine Maintenance
Used for temporary flotation and controlled movement of submerged components in shipyards and port maintenance. Reusable construction is suitable for organizations performing recurring marine maintenance operations.
Why Choose Hongruntong Marine
More Than 30 Years of Marine Manufacturing Experience
Hongruntong Marine has over 30 years of manufacturing experience in marine products, providing a long-term production foundation for inflatable underwater lifting equipment. Experience across marine product manufacturing establishes practical understanding of how components work together in finished assemblies.
Engineering-Based Customization Capability
Can develop product configurations according to project-specific requirements including target buoyancy, submerged load, operating depth, available installation space, lifting points and intended rigging method.
Material, Welding and Assembly Quality Control
Controls manufacturing process from material preparation through final assembly, with attention to dimensions, seam construction, lifting-point reinforcement and valve installation. Inspection addresses both airtightness and mechanical load transfer.
International Technical Support and Delivery Coordination
Supports specification confirmation, dimensional review, product configuration, packaging requirements, documentation and delivery coordination. Technical support continues after delivery through operation, inspection, maintenance and storage information.
Frequently Asked Questions
What material is used for Pillow Underwater Air Lift Bags?
The main body is generally manufactured from reinforced PVC-coated polyester fabric. The polyester layer provides tensile reinforcement and dimensional stability, while the PVC coating provides an airtight and flexible external surface with resistance to water and normal marine handling conditions.
How is the lifting capacity of a pillow air lift bag determined?
The available buoyancy is primarily related to the volume of water displaced by the inflated bag. However, usable lifting capacity must also consider the weight of the bag, lifting harness, shackles and other rigging components, together with water density, operating depth, submerged load condition and required reserve buoyancy.
Can Pillow Underwater Air Lift Bags be reused?
Yes. They are designed as reusable equipment when operated within specified limits and maintained correctly. After each operation, the bag should be deflated, cleaned, dried and inspected for cuts, abrasion, seam damage, deformation, valve problems and lifting-point deterioration.
What information should be provided when ordering a customized lifting bag?
Useful engineering information includes required buoyancy or submerged load, operating depth, bag dimensions, available installation space, lifting-point arrangement, expected working environment, valve requirements and intended application.
What safety and inspection documentation can be supplied?
Documentation may include product identification, rated capacity, material information, dimensional data, inspection records, test documentation and operating instructions. For projects requiring third-party inspection, applicable requirements should be specified before production.
Underwater lift bag deployment in marine environment Professional marine salvage operation using lift bags High-capacity underwater lift bag specifications
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Inflatable Underwater Lift Bags

Parachute Lifting Bags

Underwater Pillow Bags

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