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Air Lifting Bags High Buoyancy Easy Deployment Long Service Life
Cylindrical Underwater Air Lifting Bags are flexible pneumatic buoyancy devices engineered for controlled underwater lifting, vessel salvage, refloating operations, temporary flotation, submerged equipment recovery, and marine construction support. The cylindrical configuration provides an elongated buoyant body that can be installed beneath suitable sections of a vessel or underwater structure, allowing buoyancy to be distributed over a defined contact area rather than concentrated at a single lifting location.
Case Study: Underwater Recovery of a 260 Tonne Coastal Cargo Vessel
A marine salvage contractor in Southeast Asia successfully recovered a 260 tonne coastal cargo vessel using multiple cylindrical underwater lifting bags. The vessel was resting at an uneven angle on a muddy seabed with restricted access for large crane vessels. The distributed buoyancy arrangement allowed progressive refloating without creating excessive local loading, demonstrating the engineering benefit of pneumatic buoyancy in restricted marine environments.
Specifications
Product Name
Boat Air Bags
Raw Material
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
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)
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 the requirements.
Key Features
High Strength Multilayer Reinforcement System
Synthetic tire cord fabric embedded between rubber layers creates a composite flexible structure that maintains dimensional stability under internal pressure and provides excellent fatigue resistance.
Optimized Cylindrical Load Distribution
The elongated buoyancy surface supports load over defined hull sections, allowing progressive inflation and independent control of multiple lifting elements for improved operational flexibility.
Abrasion Resistant Marine Rubber Construction
Engineered rubber compounds provide protection against marine exposure and mechanical contact while maintaining flexibility for repeated deployment.
Controlled Buoyancy and Operational Pressure Management
Progressive inflation allows operators to adjust buoyancy during recovery sequences, providing reversible operating capability and enhanced control over vessel movement.
Applications
Marine Salvage and Vessel Refloating
Submerged Equipment Recovery
Marine Construction and Temporary Buoyancy
Why Choose Hongruntong Marine
Integrated Marine Rubber Product Manufacturing
30+ years of experience in manufacturing marine rubber products with systematic understanding of rubber formulation, reinforcement construction, and marine exposure conditions.
Project-Based Engineering and Customization
Customized cylindrical configurations based on required dimensions, buoyancy capacity, operating pressure, and project-specific requirements.
Controlled Quality and Technical Testing
Comprehensive inspection and testing procedures including dimensional verification, pressure testing, and quality control documentation.
Technical Support from Specification to Field Application
Full technical support covering installation, operating limitations, maintenance, and integration into engineering procedures.
Frequently Asked Questions
What materials are used to manufacture Cylindrical Underwater Air Lifting Bags?
The main body consists of reinforced synthetic tire cord fabric combined with engineered rubber compounds for tensile strength, dimensional stability, and environmental protection.
Can the lifting bags be used repeatedly?
Yes, the bags are designed as reusable pneumatic equipment when operated within specified pressure and load limits, with proper cleaning, inspection, and maintenance between uses.
How should the bags be protected from underwater obstacles?
Installation areas should be inspected and cleared of sharp objects. Additional protective padding or barriers should be used when direct contact with hazards cannot be avoided.
What information is required for selecting the correct lifting bag configuration?
Typical engineering information includes vessel weight, hull dimensions, center of gravity, available clearance, water depth, seabed condition, and required reserve buoyancy.
Can different diameters and lengths be manufactured for specific projects?
Yes, cylindrical lifting bags can be configured with different diameters, lengths, and accessory arrangements according to project-specific technical requirements.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer
Year Established:
1990
Total Annual:
5,256,780-5,593210
Employee Number:
220~360
Ecer Certification：
Verified Supplier
Hongruntong Marine is a leading marine company specializing in providing comprehensive services in the maritime industry. With a strong emphasis on quality, safety, and efficiency, we strive to meet the evolving needs of our clients.
Established in 1990, Hongruntong Ma... Hongruntong Marine is a leading marine company specializing in providing comprehensive services in the maritime industry. With a strong emphasis on quality, safety, and efficiency, we strive to meet the evolving needs of our clients.
Established in 1990, Hongruntong Ma...
