High Performance Underwater Air Lifting Bags for Flexible Operation and Cost Effective Marine Salvage
Price:
US$6-US$158
MOQ:
1
Delivery Time:
5-7 Work Days
Brand:
Hongruntong Marine
Product Description
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.
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Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.
Company
Hongruntong Marine LLC.
Location
C1-7, Xuhui Center, Jinguan North 2nd Street, Shunyi District, Beijing City, P.R. China 101300
Contact Person
William Lau