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Underwater Air Lifting Bag High Strength Wear Resistant Reliable Buoyancy for Marine Applications
Underwater Air Lifting Bag High Strength Wear Resistant Reliable Buoyancy for Marine Applications
Underwater Air Lifting Bag High Strength Wear Resistant Reliable Buoyancy for Marine Applications
Underwater Air Lifting Bag High Strength Wear Resistant Reliable Buoyancy for Marine Applications
Underwater Air Lifting Bag High Strength Wear Resistant Reliable Buoyancy for Marine Applications
Underwater Air Lifting Bag High Strength Wear Resistant Reliable Buoyancy for Marine Applications
Underwater Air Lifting Bag High Strength Wear Resistant Reliable Buoyancy for Marine Applications
Underwater Air Lifting Bag High Strength Wear Resistant Reliable Buoyancy for Marine Applications
Specifications
Layers :
1-6Ply, or as Request
Supply Ability :
1260 Pcs Per Month
Material :
PVC Coating Fabric
Model Number :
HM-BAB2
Thickness :
0.4mm-2.5mm, or as Request
Certification :
ISO, BV, ABS, DNV, LR, SGS, CCS, RMRS
Lifting Capacity :
200kg to 50 tons
MOQ :
1
MOQ :
1
Delivery Time :
5-7 Work Days
Application :
Structural Load Testing, Proof Load Testing
Payment Terms :
L/C,T/T,D/A,D/P,Western Union,MoneyGram
Color :
Black, Yellow, Orange, or as Request
Brand Name :
Hongruntong Marine
Feature :
Durable Construction, Easy Filling and Emptying
Price :
US$30-US$115
Reinforcement :
Nylon Fabric
Place of Origin :
China
Product Name :
Boat Air Bags
Packaging Details :
Wooden Pallets, Wooden Box
Description
Underwater Air Lifting Bag High Strength Wear Resistant Reliable Buoyancy
Product Overview

Cylindrical Underwater Air Lifting Bags are engineered pneumatic buoyancy devices designed for underwater lifting, vessel salvage, controlled refloating, submerged equipment recovery, temporary flotation, and marine construction operations. The cylindrical configuration provides an elongated buoyancy body that can be positioned beneath suitable sections of vessels, pontoons, structural components, or other submerged loads.

Case Study: Recovery of a 310 Tonne Offshore Service Vessel in the United Arab Emirates

A marine engineering contractor successfully recovered a 310 tonne offshore service vessel that had partially settled on the seabed near a coastal maintenance facility. The vessel had experienced flooding in several compartments and was resting with a significant stern-down attitude.

The contractor developed a distributed pneumatic buoyancy arrangement using Cylindrical Underwater Air Lifting Bags positioned at structurally suitable locations beneath the hull. The recovery operation began with controlled low-pressure inflation, followed by progressive air introduction according to the predetermined lifting sequence.

The project demonstrated the usefulness of independently controlled cylindrical buoyancy units in a restricted marine environment, allowing the recovery team to manage trim during the lifting sequence.

Underwater Air Lifting Bag High Strength Wear Resistant Reliable Buoyancy for Marine Applications Underwater Air Lifting Bag High Strength Wear Resistant Reliable Buoyancy for Marine Applications
Technical Specifications
Product NameBoat Air Bags
Raw MaterialPVC coating fabric
TypeCylindrical
Size500kg, 1000kg, 5000kg, 10000kg, etc
Thickness0.4-1.2mm, or as request
ColorYellow, Blue, Black, etc
Density0.33-0.9g/cm³
Safety Factor7:1
Tolerances+/- 0.03 on densities, +/- 0.2 mm on thickness, +/- 0 to +3mm on width, +/- 0 to +3mm on length
Model Specifications
ModelBuoyancy (kg)Buoyancy (lbs)Diameter (mm)Length (mm)Approx. Weight (kg)
HM-ULB012004415001,0005
HM-ULB025001,1038001,0008
HM-ULB031,0002,2051,0001,50011
HM-ULB042,0004,4101,3001,50020
HM-ULB054,0008,8201,6002,00050
HM-ULB066,00013,2302,0002,00066
HM-ULB078,00017,6402,0002,60075
HM-ULB0810,00022,0502,4002,40080
HM-ULB0915,00033,0752,6003,000110
HM-ULB1020,00044,1003,0003,000130
HM-ULB1130,00066,1503,0004,500170
HM-ULB1250,000110,2504,0004,000220
HM-ULB1370,000154,3504,0005,700310
HM-ULB14100,000220,5004,0008,000450
HM-ULB15150,000330,7505,0008,000660
HM-ULB16200,000441,0005,00010,000900

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

Key Features
  • High Strength Reinforcement: Synthetic cord fabric embedded within multiple rubber layers provides tensile resistance and dimensional stability under internal pressure
  • Cylindrical Configuration: Elongated shape allows buoyant force distribution along defined sections of vessels or structures
  • Marine Grade Rubber: External rubber layer provides protection against seawater, abrasion, and environmental exposure
  • Adjustable Buoyancy: Pneumatic operation enables controlled buoyancy adjustment through compressed air regulation
  • Transport Efficiency: Can be transported and stored in deflated condition, reducing logistical volume
Applications
  • Offshore Vessel Recovery: Recovery and refloating of offshore service vessels, crew boats, workboats, barges, and other marine craft
  • Submerged Marine Structure Installation: Temporary flotation during installation and positioning of underwater structural components
  • Port and Shipyard Maintenance: Temporary flotation support, vessel repositioning, underwater repair, and recovery of submerged equipment
Why Choose Hongruntong Marine
  • 30+ Years Manufacturing Experience: Extensive expertise in marine products and engineered rubber equipment
  • Customized Engineering: Tailored solutions for different underwater conditions and project requirements
  • Quality Manufacturing Process: Controlled construction process with comprehensive quality inspection
  • Global Project Coordination: International delivery coordination with comprehensive technical support
Frequently Asked Questions
What factors determine the lifting capacity required for a cylindrical bag?
The calculation should consider submerged weight, lifting height, underwater clearance, water depth, vessel center of gravity, hull geometry, number of bags, seabed resistance, environmental conditions, and required reserve buoyancy.
Can cylindrical lifting bags be installed beneath a partially flooded vessel?
Yes, they can be used in suitable partially flooded vessel recovery operations. However, the changing underwater weight during dewatering must be considered, and inflation should follow an established recovery procedure.
Are special restraints required during underwater inflation?
Appropriate restraint and positioning arrangements are normally required to prevent unwanted lateral movement or rolling of the bag during inflation, depending on hull geometry and seabed conditions.
How can the service life of the lifting bags be maintained?
Service life depends on operating pressure, deployment frequency, environmental exposure, and maintenance. Bags should be inspected before and after use, cleaned, dried completely, and stored properly.
Can the product be supplied with different valves and connection arrangements?
Yes. Inflation valves, connection points, reinforced end sections, lifting fittings, and related accessories can be configured according to project requirements.
Underwater Air Lifting Bag High Strength Wear Resistant Reliable Buoyancy for Marine Applications Underwater Air Lifting Bag High Strength Wear Resistant Reliable Buoyancy for Marine Applications Underwater Air Lifting Bag High Strength Wear Resistant Reliable Buoyancy for Marine Applications
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Underwater Air Lifting Bag High Strength Wear Resistant Reliable Buoyancy for Marine Applications

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Product Detail
Layers :
1-6Ply, or as Request
Supply Ability :
1260 Pcs Per Month
Material :
PVC Coating Fabric
Model Number :
HM-BAB2
Thickness :
0.4mm-2.5mm, or as Request
Certification :
ISO, BV, ABS, DNV, LR, SGS, CCS, RMRS
Contact Supplier
Underwater Air Lifting Bag High Strength Wear Resistant Reliable Buoyancy for Marine Applications
Underwater Air Lifting Bag High Strength Wear Resistant Reliable Buoyancy for Marine Applications
Underwater Air Lifting Bag High Strength Wear Resistant Reliable Buoyancy for Marine Applications
Underwater Air Lifting Bag High Strength Wear Resistant Reliable Buoyancy for Marine Applications

Hongruntong Marine LLC.

Verified Supplier
4 Years
beijing, beijing
Since 1990
Business Type :
Manufacturer
Main Products :
Marine Rubber Airbags, Marine Salvage Airbags, Inflatable Marine Airbags
Total Annual :
5,256,780-5,593210
Employee Number :
220~360
Certification Level :
Verified Supplier
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