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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 Tasks
The 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.
Rapid Deployment for Emergency and Time-Critical Operations
Engineered 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.
High Performance Material System with Long-Term Fatigue Resistance
Constructed 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 Management
Safety 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 Engineering
Specializes in developing solutions for urgent marine recovery and high-risk engineering operations, ensuring reliability when time and safety are critical factors.
Advanced System Integration and Engineering Capability
Provides not just products but complete lifting solutions, including modular system design, engineering consultation, and project-specific configuration support.
Premium Grade Materials with Verified Long-Term Performance
All products are manufactured using certified high-strength materials tested for fatigue resistance, corrosion protection, and long-term underwater performance.
Global Service Network with Fast Technical Response
Offers 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.
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...
