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Underwater Lift Bags with PVC Coating Fabric and 200kg to 50 Tons Lifting Capacity in Cylindrical Type

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Underwater Lift Bags with PVC Coating Fabric and 200kg to 50 Tons Lifting Capacity in Cylindrical Type
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Features
Specifications
Material: PVC Coating Fabric
Lifting Capacity: 200kg To 50 Tons
Lifting Capacity: 200kg To 50 Tons
Name: Underwater Lift Bags
Name: Underwater Lift Bags
Thickness: 0.4mm-2.5mm, Or As Request
Usage: Underwater Air Lifting, Salvage, Large Buoyancy
Feature: Durable Construction, Easy Filling And Emptying
Application: Structural Load Testing, Proof Load Testing
Reinforcement: Nylon Fabric
Color: Black, Yellow, Orange, Or As Request
Layers: 1-6Ply, Or As Request
Type: Cylindrical
Highlight:

PVC Coating Fabric Underwater Lift Bags

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200kg to 50 Tons Lifting Capacity Inflatable Buoyancy Bags

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Cylindrical Type Marine Salvage Bags
Basic Infomation
Place of Origin: China
Brand Name: Hongruntong Marine
Certification: ISO, BV, ABS, DNV, LR, SGS, CCS, RMRS
Model Number: HM-ULB56
Payment & Shipping Terms
Packaging Details: Wooden Pallets, Wooden Box
Delivery Time: 5-7 Work Days
Payment Terms: L/C,D/A,D/P,T/T,Western Union,
Supply Ability: 3216 Pieces Per Month
Product Description
Underwater Lift Bags: Excellent Air Sealing Property with Flexible Inflatable Design for Safe Buoyancy
Underwater Lift Bags are engineered inflatable buoyancy systems developed for controlled underwater lifting, recovery, flotation assistance, stabilization, and positioning of submerged loads. By enclosing a controlled volume of air and displacing surrounding water, the equipment generates positive buoyancy that reduces the effective submerged weight of the connected load.
Product Overview
Constructed from high-strength synthetic reinforcement fabric combined with durable rubber or elastomeric coating, these lift bags provide tensile strength and dimensional stability while protecting against abrasion, water exposure, and marine surface contact. Reinforced seams, load-bearing straps, lifting points, inflation valves, and connection components are integrated for controlled force transfer during operation.
Case Study: Temporary Buoyancy System for Offshore Structural Maintenance
An offshore maintenance contractor in the North Sea required temporary buoyancy support during replacement of a 16-tonne submerged steel service structure. The restricted working area made conventional rigid lifting frames impractical. Multiple Underwater Lift Bags were positioned at different points beneath the assembly and inflated gradually to distribute buoyancy and maintain stable attitude during initial separation and temporary flotation.
The multi-point arrangement prevented excessive rotation and allowed the offshore team to maintain controlled positioning. Once replacement work was ready, the structure was moved laterally while bags maintained temporary buoyancy. The equipment was subsequently inspected and retained for future offshore maintenance activities, demonstrating suitability for confined working areas with compact transportation benefits.
Underwater lift bag deployment in marine environment Close-up view of underwater lift bag construction
Technical Specifications
Product Name Underwater Lift Bags
Raw Material PVC coating fabric
Type Cylindrical
Size 500kg, 1000kg, 5000kg, 10000kg, etc.
Thickness 0.4-1.2mm, or as requested
Color Yellow, Blue, Black, etc.
Density 0.33-0.9g/cm³
Safety Factor 7:1
Tolerances ±0.03 on densities, ±0.2mm on thickness, ±0 to +3mm on width, ±0 to +3mm on length
Model Specifications
Model Buoyancy (kg) Buoyancy (lbs) Diameter (mm) Length (mm) Approx. Weight (kg)
HM-ULB01 200 441 500 1,000 5
HM-ULB02 500 1,103 800 1,000 8
HM-ULB03 1,000 2,205 1,000 1,500 11
HM-ULB04 2,000 4,410 1,300 1,500 20
HM-ULB05 4,000 8,820 1,600 2,000 50
HM-ULB06 6,000 13,230 2,000 2,000 66
HM-ULB07 8,000 17,640 2,000 2,600 75
HM-ULB08 10,000 22,050 2,400 2,400 80
HM-ULB09 15,000 33,075 2,600 3,000 110
HM-ULB10 20,000 44,100 3,000 3,000 130
HM-ULB11 30,000 66,150 3,000 4,500 170
HM-ULB12 50,000 110,250 4,000 4,000 220
HM-ULB13 70,000 154,350 4,000 5,700 310
HM-ULB14 100,000 220,500 4,000 8,000 450
HM-ULB15 150,000 330,750 5,000 8,000 660
HM-ULB16 200,000 441,000 5,000 10,000 900
Note: Other sizes can be customized according to requirements.
Key Features
  • Reinforced Structural Integrity: High-strength synthetic reinforcement with durable coating provides tensile strength and dimensional stability for reliable underwater load support
  • High Wear Resistance: Rubber or elastomeric coating withstands demanding contact conditions with marine surfaces and structures
  • Controlled Inflation: Progressive load reduction allows operators to monitor response and maintain stability during lifting operations
  • Compact Transportation: Deflated condition reduces storage volume and simplifies deployment in restricted working areas
Applications
  • Coastal Infrastructure Maintenance: Temporary buoyancy for submerged structural frames, marine hardware, and construction components
  • Shipyard and Dock Engineering: Moving submerged steel components and machinery in wet docks and maintenance basins
  • Underwater Construction Component Handling: Installation, removal, and repositioning of submerged construction components with controlled flotation
Why Choose Hongruntong Marine
30+ Years Manufacturing Experience: Extensive background in marine product manufacturing with practical understanding of material selection and structural construction for operational reliability.
Material Selection & Reinforcement Engineering: Careful selection of reinforcement fabric, coating systems, and components balanced for strength, flexibility, and durability.
Manufacturing Control & Product Inspection: Consistent production with rigorous inspection of lifting body, straps, seams, valves, and connection areas.
Technical Support: Comprehensive support from product selection through project use, including customization for specific application requirements.
Frequently Asked Questions
Can Underwater Lift Bags be used for loads partially buried in sediment?
Yes, when properly engineered. Initial buoyancy reduces contact force before additional lifting force is applied. Seabed condition, degree of burial, and load geometry should be evaluated before deployment.
What determines the number of lifting bags required?
Quantity depends on submerged weight, required buoyancy, load dimensions, center of gravity, attachment locations, water depth, and desired load distribution. Configuration should be established through proper lifting planning.
Can equipment remain installed underwater for extended periods?
Suitability depends on project environment, material specification, operating pressure, water depth, and exposure conditions. Condition should be monitored periodically for long-term deployment.
What maintenance is required after underwater use?
Clean of sediment, allow to dry, and visually inspect body, seams, lifting straps, connection points, valves, and inflation components. Store in dry environment away from sharp objects and excessive heat.
Can lifting bags be supplied with different connection arrangements?
Yes. Connection configurations can be adapted for intended lifting method and load geometry. Provide detailed load information and connection requirements during design stage.
Underwater lift bag in operational use Marine airbag surface detail and construction Industrial marine airbag application
Tag:

Salvage Underwater Lift Bags

underwater salvage lift bags

marine lift bags

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Tel : +8618910539783
Fax : 86-10-89461910
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