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Marine Salvage Lift Bags High Performance Flexible Operation Cost Effective
Product Overview
Cylindrical Underwater Air Lifting Bags are engineered inflatable buoyancy devices developed for marine salvage, vessel recovery, underwater lifting, temporary flotation, structural positioning, and subsea maintenance operations. The product consists of a cylindrical reinforced rubber body that generates upward buoyancy after being inflated with compressed air beneath a submerged load.
Case Study: Temporary Flotation Support for a 68 Tonne Patrol Vessel
A coastal shipyard in Southeast Asia successfully used cylindrical Underwater Air Lifting Bags to provide supplementary buoyancy for a 68 tonne steel patrol vessel during underwater hull repairs following a grounding incident. The system reduced the vessel's effective draft and increased working clearance beneath the hull while maintaining stable trim throughout inspection and repair processes.
Technical Specifications
Product Name
Boat Air Bags
Raw Material
PVC coating fabric
Type
Cylindrical
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, +/- 0.2 mm 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 the requirements.
Key Features
Controlled Pressure and Geometric Stability: Reinforcement structure maintains dimensional stability during operation for consistent load transfer
Load Capacity Through Reinforced Structural Design: Multilayer construction provides mechanical strength for pressure-loaded marine service
Temperature and Environmental Adaptability: Designed to maintain performance across expected operating temperature ranges and marine conditions
Flexible Installation and Handling Configuration: Deflated transport and positioning enables access to confined marine work areas
Applications
Shipyard Underwater Maintenance: Supplementary flotation for hull inspection, cleaning, and underwater repair
Port Emergency Response: Emergency equipment for grounded or partially submerged vessels
Temporary Flotation for Marine Construction: Support for pontoons, structural frames, and underwater assemblies
Why Choose Hongruntong Marine
30+ Years Marine Manufacturing Experience: Technical expertise in rubber materials, fabric reinforcement, and pressure-loaded structures
Customized Dimensions and Configuration: Project-specific design for optimal installation and performance
Comprehensive Quality Control and Testing: Rigorous inspection procedures for pressure retention and fatigue performance
Technical Service and Global Delivery: Support from initial inquiry through delivery and operational guidance
Frequently Asked Questions
Can Cylindrical Underwater Air Lifting Bags be used for planned maintenance rather than emergency salvage?
Yes. They can provide supplementary buoyancy during underwater inspection, hull maintenance, repair, and temporary draft reduction when the vessel and lifting arrangement are suitable for this method.
What is the purpose of the reinforcement layers inside the cylindrical body?
The reinforcement layers provide tensile strength and control expansion caused by internal air pressure. They help maintain dimensional stability and support pressure retention while the rubber layers provide flexibility and environmental protection.
Can the lifting bags operate in areas with temperature changes?
They can be used within the manufacturer's specified operating temperature range. Storage and operation should avoid conditions that could significantly degrade the rubber, including excessive heat, prolonged direct sunlight, aggressive chemicals, or freezing conditions outside the product specification.
How are bags selected when underwater clearance is very limited?
Diameter is a critical parameter because it determines the approximate inflation height and available displacement volume. A suitable diameter and effective length should be selected together based on the available clearance, required buoyancy, vessel configuration, and lifting procedure.
Can Hongruntong Marine manufacture a customized lifting system for a specific vessel?
Yes. Cylindrical lifting bags can be configured according to vessel dimensions, required buoyancy, installation clearance, lifting sequence, valve requirements, fittings, and handling arrangements. The final configuration should be established from the project's engineering requirements before production.
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...
