Underwater Lifting Bag with Balanced Buoyancy Distribution Deep Water Compatible and Long Service Life
Price:
US$190-US$889
MOQ:
1
Delivery Time:
5-8 Work Days
Brand:
Hongruntong Marine
Product Description
Cylindrical Underwater Air Lift Bag
The cylindrical Underwater Air Lift Bag is an advanced marine buoyancy and lifting solution designed for integrated engineering applications, emergency recovery operations, and complex underwater construction environments. Manufactured from high-performance multi-layer synthetic fabric reinforced with industrial-grade polyurethane and PVC composite coatings, it provides excellent resistance to abrasion, seawater corrosion, UV exposure, and long-term fatigue under cyclic loading.
The cylindrical geometry ensures stable vertical lift performance and balanced load distribution even under irregular underwater conditions. Each unit features reinforced lifting points, high-pressure inflation valves, quick-connect fittings, and multi-stage safety release systems for precise buoyancy control and operational safety.
With lifting capacities ranging from 2 tons to over 400 tons, the system is suitable for both light-duty emergency response and large-scale offshore engineering projects. It is widely used in salvage operations, marine infrastructure installation, harbor engineering, and underwater maintenance tasks.
Case Study: Emergency Vessel Recovery & Harbor Clearance
In a European commercial harbor, a 1,800-ton cargo vessel partially sank after a collision during docking operations, blocking a major shipping channel. The situation required immediate clearance to restore port operations, with strict limitations on environmental impact and operational downtime.
Hongruntong cylindrical underwater air lift bags were rapidly deployed as part of an emergency response system. A modular lifting configuration was used to stabilize the vessel and gradually restore buoyancy. The controlled inflation process allowed engineers to lift the vessel in phases, ensuring structural integrity while preventing secondary damage.
Within 48 hours, the vessel was successfully refloated and moved to a repair zone. The harbor resumed partial operations shortly after, significantly reducing economic losses. The client highlighted the system's rapid deployment capability, operational stability, and effectiveness in emergency marine recovery scenarios.
Specifications
| Product Name | Underwater Air Lift Bags |
| Raw Material | Superior PVC Coating Fabric |
| Type | Cylindrical |
| Size | 500kg, 1000kg, 5000kg, 10000kg, etc |
| Thickness | 0.4mm-2.5mm, or as requested |
| Color | Yellow, Blue, Black, etc |
| Density | 0.33-0.9g/cm³ |
| Safety Factor | 7:1 |
| Accessories | Valve, Inflatable Tube, Repair Material |
| OEM | Welcome |
| Warranty | 3 Years |
| 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) | Weight (kg) |
|---|---|---|---|---|---|
| HM-C01 | 200 | 441 | 500 | 1,000 | 5 |
| HM-C02 | 500 | 1,103 | 800 | 1,000 | 8 |
| HM-C03 | 1,000 | 2,205 | 1,000 | 1,500 | 11 |
| HM-C04 | 2,000 | 4,410 | 1,300 | 1,500 | 20 |
| HM-C05 | 4,000 | 8,820 | 1,600 | 2,000 | 50 |
| HM-C06 | 6,000 | 13,230 | 2,000 | 2,000 | 66 |
| HM-C07 | 8,000 | 17,640 | 2,000 | 2,600 | 75 |
| HM-C08 | 10,000 | 22,050 | 2,400 | 2,400 | 80 |
| HM-C09 | 15,000 | 33,075 | 2,600 | 3,000 | 110 |
| HM-C10 | 20,000 | 44,100 | 3,000 | 3,000 | 130 |
| HM-C11 | 30,000 | 66,150 | 3,000 | 4,500 | 170 |
| HM-C12 | 50,000 | 110,250 | 4,000 | 4,000 | 220 |
| HM-C13 | 70,000 | 154,350 | 4,000 | 5,700 | 310 |
| HM-C14 | 100,000 | 220,500 | 4,000 | 8,000 | 450 |
| HM-C15 | 150,000 | 330,750 | 5,000 | 8,000 | 660 |
| HM-C16 | 200,000 | 441,000 | 5,000 | 10,000 | 900 |
Note: Other sizes can be customized according to requirements.
Key Features
-
Integrated Modular Lifting System for Complex Engineering TasksThe air lift bag system is designed for modular integration, allowing multiple units to be combined for scalable lifting capacity. This flexibility enables engineers to design customized lifting configurations for complex underwater structures, uneven loads, and large-scale salvage operations.
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Rapid Deployment for Emergency and Time-Critical OperationsEngineered for fast response scenarios, the system features quick-connect inflation valves and simplified rigging interfaces. This allows deployment within a short time frame, making it highly effective for emergency vessel recovery and disaster response operations.
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High Performance Material System with Long-Term Fatigue ResistanceConstructed using reinforced composite fabric layers that provide excellent resistance to cyclic loading and long-term mechanical fatigue. The material maintains structural integrity even under repeated inflation and deflation cycles.
-
Multi-Level Safety Architecture with Controlled Buoyancy ManagementSafety is enhanced through a multi-layer protection system including overpressure relief valves, controlled exhaust mechanisms, and reinforced connection points. This ensures stable and predictable buoyancy adjustments during lifting operations.
Applications
- Emergency Vessel Salvage and Harbor Clearance - Rapid deployment system for refloating sunken or damaged vessels and clearing navigation channels
- Marine Infrastructure Installation and Maintenance - Supports installation of docks, floating structures, and underwater components with controlled lifting capability
- Integrated Offshore and Coastal Engineering Projects - Used in combined engineering operations requiring flexible lifting, repositioning, and stabilization of submerged structures
Why Choose Hongruntong Marine
-
Strong Focus on Emergency Response and Mission-Critical EngineeringSpecializes in developing solutions for urgent marine recovery and high-risk engineering operations, ensuring reliability when time and safety are critical factors.
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Advanced System Integration and Engineering CapabilityProvides not just products but complete lifting solutions, including modular system design, engineering consultation, and project-specific configuration support.
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Premium Grade Materials with Verified Long-Term PerformanceAll products are manufactured using certified high-strength materials tested for fatigue resistance, corrosion protection, and long-term underwater performance.
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Global Service Network with Fast Technical ResponseOffers international support capabilities, ensuring fast communication, technical assistance, and project coordination for clients worldwide.
Frequently Asked Questions
What is the fastest deployment time for emergency use?
With proper preparation, deployment and inflation can be completed within minutes.
Can the system be used in emergency salvage operations?
Yes, it is specifically designed for rapid-response marine recovery tasks.
Are multiple bags required for large vessels?
Yes, modular configurations are recommended for balanced lifting of large structures.
What is the service life of the air lift bags?
With proper maintenance, they can be used for many years under repeated cycles.
How is operational safety ensured?
Through multi-stage pressure control systems and reinforced structural design.
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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