Specifications
Brand Name :
Hongruntong Marine
Model Number :
HM-BAB58
Certification :
ISO, BV, ABS, DNV, LR, SGS, CCS, RMRS
Place of Origin :
China
MOQ :
1
Price :
US$13-US$669
Payment Terms :
L/C, T/T, D/A, D/P, Western Union, MoneyGram
Supply Ability :
2390 Pcs Per Month
Delivery Time :
5-7 Work Days
Packaging Details :
Wooden Pallets, Wooden Box
Product Name :
Boat Air Bags
Material :
PVC Coating Fabric
Lifting Capacity :
200kg to 50 tons
Feature :
Durable Construction, Easy Filling and Emptying
Reinforcement :
Nylon Fabric
Layers :
1-6Ply, or as Request
Application :
Structural Load Testing, Proof Load Testing
Thickness :
0.4mm-2.5mm, or as Request
Color :
Black, Yellow, Orange, or as Request
Description

Lift Bags Heavy Load Capacity Corrosion Resistant Compact Storage

Description

Boat Air Bags are specialized inflatable marine lifting devices engineered for underwater salvage, refloating of sunken or partially submerged vessels, heavy subsea object relocation, and controlled buoyancy operations. Constructed with high-strength synthetic tire cord fabrics encapsulated in abrasion-resistant marine-grade rubber, these airbags are designed to provide reliable lifting capacity, precise buoyancy control, and structural resilience under submersion conditions. While marketed under the term “Boat Air Bags,” their primary function aligns with underwater lifting and salvage operations.

These airbags are engineered to resist hydrostatic pressure, repeated inflation cycles, abrasion from underwater structures, and corrosive effects of seawater. Their multi-layer reinforcement ensures uniform stress distribution and minimizes localized strain during lifting operations. Advanced vulcanization ensures durability, structural integrity, and long-term performance even under repetitive high-load cycles.

Boat Air Bags can be deployed individually or in coordinated arrays depending on load size and operational requirements. Controlled inflation allows fine-tuning of buoyancy for delicate lifting tasks, minimizing the risk of structural stress to the submerged object. Compared with traditional crane-based lifting or rigid pontoons, these airbags offer flexible deployment, rapid mobilization, and cost-effective underwater salvage solutions.

Applications include sunken vessel recovery, heavy subsea equipment relocation, offshore marine structure installation, pipeline flotation, and emergency underwater lifting tasks. Their robust design, precise controllability, and reusability make them indispensable for marine salvage contractors, offshore operators, and coastal authorities managing underwater recovery operations.

Case Study – Sunken Cargo Vessel Recovery in the North Sea

A marine salvage contractor in the North Sea faced the challenge of refloating a partially submerged 2,800-ton cargo vessel that had settled unevenly on a muddy seabed following severe weather. The vessel’s hull was partially filled with water, and conventional crane or barge lifting was deemed unsafe due to depth, load weight, and restricted maneuvering space. The project demanded a controlled underwater lifting solution that could gradually restore buoyancy without compromising hull integrity.

Hongruntong Marine provided a tailored set of Boat Air Bags engineered for precise underwater lifting. Prior to deployment, engineers conducted detailed buoyancy calculations, attachment point design, and staged inflation sequencing to ensure even lifting forces and stability. Divers positioned the airbags at multiple key locations along the hull to distribute load evenly and minimize torsional stress during refloating.

During the operation, controlled air injection gradually increased buoyancy, lifting the vessel incrementally from the seabed. The airbags’ elastic structure adapted to the hull contours and seabed irregularities, ensuring smooth, predictable lifting. The refloating operation was completed safely without hull deformation or additional structural damage. Following successful recovery, the airbags were reused for heavy subsea equipment repositioning in the same project, demonstrating their durability and operational versatility. The salvage team reported improved safety, cost efficiency, and operational confidence compared with conventional heavy lifting methods, confirming the effectiveness of buoyancy-based lifting technology in complex underwater recovery scenarios.

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 Buoyancy Diameter Length Appr. Weight
Cylindrical [kg] [lbs] [mm] [mm] [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.

Features

High Precision Buoyancy Control

Boat Air Bags provide adjustable and predictable lifting force, enabling controlled refloating or repositioning of sunken or submerged vessels. The airbag volume and inflation rate can be precisely controlled to manage lift in incremental stages. This ensures minimal risk of sudden load shifts or structural stress, which is critical during delicate salvage operations. For large-scale lifting, multiple airbags can be synchronized to maintain balanced load distribution across the object.

Reinforced Structural Integrity for Deep Water Operations

The internal construction consists of multi-layer high-strength tire cord fabrics bonded with marine-grade rubber. This reinforcement provides exceptional resistance to hydrostatic pressure, tensile stress, and repeated inflation cycles. The vulcanization process ensures the layers remain bonded under continuous operation, preventing deformation or delamination. This structural integrity allows safe lifting in varying depths and operational conditions, including offshore environments.

Marine Grade Material Durability

Boat Air Bags are built with specialized rubber compounds resistant to seawater corrosion, abrasion, microbial attack, and UV exposure. The outer layer is engineered to resist puncture, tearing, and mechanical friction from contact with ship hulls or seabed surfaces. These properties ensure consistent performance, long service life, and safe operations in harsh underwater conditions.

Flexible Deployment and Reusability

Compared to heavy crane systems or rigid pontoons, Boat Air Bags can be deployed rapidly, transported compactly, and inflated underwater for precise buoyancy control. Their design allows repeated use across multiple salvage and lifting projects. This flexibility reduces mobilization costs and increases operational efficiency, especially in remote or challenging underwater environments where conventional lifting equipment is impractical.

Applications


Sunken Vessel Recovery

Boat Air Bags are widely used in marine salvage operations for refloating sunken or partially submerged vessels. Controlled inflation provides gradual lifting while minimizing hull stress, ensuring safe recovery even in challenging seabed conditions.

Heavy Subsea Equipment Relocation

These airbags can lift and reposition large underwater objects such as machinery, offshore platform modules, or anchors. Their controllable buoyancy allows precise handling of delicate or heavy structures without the need for cranes or barges.

Emergency Underwater Lifting

Boat Air Bags are invaluable for rapid emergency response, including stabilizing partially submerged vessels, assisting in spill response operations, or supporting temporary underwater infrastructure repairs. Their rapid deployment and flexibility enhance operational safety and efficiency.

Why Choose Hongruntong Marine


Specialized Expertise in Underwater Lifting Solutions

Hongruntong Marine specializes in inflatable lifting technology for underwater applications. Our engineering team provides precise buoyancy calculations, structural load assessments, and operational guidance, ensuring safe and efficient performance even under complex subsea conditions.

Advanced Manufacturing and Quality Assurance

Using high-strength reinforcement fabrics and marine-grade rubber compounds, each airbag undergoes rigorous pressure testing, inspection, and durability verification. Our strict quality control ensures consistent performance, long-term reliability, and compliance with demanding marine salvage standards.

Custom Engineering for Complex Subsea Operations

Every lifting or salvage project presents unique challenges in terms of load, depth, seabed conditions, and structural requirements. Hongruntong Marine provides customized airbag design, attachment planning, and inflation sequencing to optimize safety, operational efficiency, and project success.

Comprehensive Technical Support and Lifecycle Services

Beyond manufacturing, we provide operational guidance, maintenance recommendations, and on-site technical support. This ensures that customers maximize equipment lifespan, maintain safe operations, and achieve consistent results across multiple underwater lifting projects.

FAQ

1. What is the maximum lifting capacity of Boat Air Bags?
Capacity depends on bag size, volume, operating depth, and deployment configuration. Engineering assessment is recommended for precise lifting calculations.

2. Can Boat Air Bags be reused after underwater salvage operations?
Yes, they are designed for repeated use. Proper cleaning, inspection, and storage will ensure long-term operational reliability.

3. Are these airbags suitable for deep-water operations?
Yes, provided the design pressure rating matches project depth. Multi-layer reinforcement ensures structural integrity under hydrostatic pressure.

4. How are Boat Air Bags positioned and secured underwater?
They can be attached using straps, chains, or custom rigging points, typically installed by professional divers or remotely operated equipment, depending on the project.

5. Do you offer engineering support for lifting operations?
Yes. Hongruntong Marine provides technical consultation, buoyancy calculations, inflation procedures, and operational guidance to ensure safe and effective use in all underwater lifting projects.

Lift Bags Heavy Load Capacity Corrosion Resistant Compact Storage Lift Bags Heavy Load Capacity Corrosion Resistant Compact Storage Lift Bags Heavy Load Capacity Corrosion Resistant Compact Storage Lift Bags Heavy Load Capacity Corrosion Resistant Compact Storage 

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Lift Bags Heavy Load Capacity Corrosion Resistant Compact Storage 

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Brand Name :
Hongruntong Marine
Model Number :
HM-BAB58
Certification :
ISO, BV, ABS, DNV, LR, SGS, CCS, RMRS
Place of Origin :
China
MOQ :
1
Price :
US$13-US$669
Contact Supplier
Lift Bags Heavy Load Capacity Corrosion Resistant Compact Storage 
Lift Bags Heavy Load Capacity Corrosion Resistant Compact Storage 
Lift Bags Heavy Load Capacity Corrosion Resistant Compact Storage 
Lift Bags Heavy Load Capacity Corrosion Resistant Compact Storage 

Hongruntong Marine LLC.

Verified Supplier
3 Years
beijing, beijing
Since 1990
Business Type :
Manufacturer
Total Annual :
5,256,780-5,593210
Employee Number :
220~360
Certification Level :
Verified Supplier
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