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Marine Salvage Lift Bags Flexible Inflatable Easy Installation Long Service Life
Parachute Underwater Air Lift Bags are flexible buoyancy lifting devices engineered for controlled underwater recovery, marine salvage, submerged equipment handling, subsea construction, and temporary flotation operations. The parachute-type configuration generates upward buoyant force when inflated with compressed air while allowing surrounding water to discharge through the open lower section, providing a flexible method for reducing submerged weight and supporting controlled vertical movement.
Product Overview
The main body is manufactured from high-strength coated technical fabric based on polyester reinforcement with protective polymer coating. This construction provides flexibility during deployment and storage while maintaining resistance to water exposure, abrasion, and mechanical loading. Reinforced seams, load-bearing webbing, suspension components, lifting points, and inflation valves are integrated to ensure proper force transfer through the lifting system.
The operating principle is based on displacement - when compressed air enters the bag, the increasing air volume displaces water, generating upward buoyancy. Actual lifting force depends on operating depth, air volume, water density, submerged load condition, and environmental factors. Selection should be based on engineered lifting calculations rather than dry weight alone.
Case Study: Submerged Fishing Vessel Recovery
A marine salvage contractor successfully recovered a 38-tonne steel fishing vessel from 16 meters depth using multiple parachute lift bags. The distributed buoyancy arrangement allowed controlled separation from uneven seabed sediment through staged inflation. This approach reduced direct lifting force requirements from surface equipment and provided divers with improved access to the hull underside.
The operation demonstrated the value of properly maintained parachute lift-bag systems supported by appropriate engineering calculations, inspection procedures, and operational controls. The same methodology was subsequently applied to other recovery operations with adjusted configurations.
Technical Specifications
Product Name
Underwater Air Lift Bags
Raw Material
Top-Notch PVC Coating Fabric
Type
Parachute
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
Accessories
Valve, Inflatable Tube, Repair Material
Warranty
3 Years
Tolerances: +/- 0.03 on densities, +/- 0.2 mm on thickness, +/- 0 to +3mm on width, +/- 0 to +3mm on length
Capacity Models
Model
Lifting Capacity (kg)
Lifting Capacity (lbs)
Dimensions (mm)
Approx. Weight (kg)
HM-P01
200
441
800
5
HM-P02
500
1,103
1,000
8
HM-P03
1,000
2,205
1,300
11
HM-P04
2,000
4,410
1,600
20
HM-P05
4,000
8,820
2,000
50
HM-P06
6,000
13,230
2,300
66
HM-P07
8,000
17,640
2,500
75
HM-P08
10,000
22,050
2,700
80
HM-P09
15,000
33,075
3,100
110
HM-P10
20,000
44,100
3,400
130
HM-P11
30,000
66,150
3,900
170
HM-P12
50,000
110,250
4,600
220
HM-P13
70,000
154,350
5,200
310
HM-P14
100,000
220,500
5,800
450
HM-P15
150,000
330,750
6,600
660
HM-P16
200,000
441,000
7,300
900
Note: Other sizes can be customized according to requirements.
Key Features
High-Strength Coated Fabric Construction: Reinforced polyester substrate with protective polymer coating provides flexibility and structural performance, resistant to water exposure, abrasion, and mechanical loading
Reinforced Harness and Load Transfer Structure: Properly designed load path distributes forces through reinforced sections, reducing stress concentration and improving handling durability
Progressive Buoyancy Generation and Lifting Control: Staged inflation allows initial buoyancy establishment, inspection, and adjustments before full lifting force application
Capacity Flexibility and Multi-Bag Configuration: Range of capacities supports various project requirements, with multi-bag systems providing distributed support and orientation control
Applications
Marine Salvage and Submerged Vessel Recovery: Recovery of fishing vessels, workboats, barges, and marine structures with distributed buoyancy and controlled seabed separation
Underwater Equipment and Structural Recovery: Lifting of pumps, machinery, construction components, and fabricated structures with flexible accommodation of various load geometries
Offshore and Subsea Construction Support: Temporary buoyancy for pipelines, structural sections, equipment frames, and installation activities where storage space is limited
Why Choose Hongruntong Marine
30+ Years Marine Manufacturing Experience: Extensive background in marine and industrial products supporting production consistency and operational reliability
Technical Fabric and Component Selection: Comprehensive evaluation of fabric, coating, reinforcement, webbing, and structural components according to application requirements
Customized Engineering Configuration: Tailored capacity, dimensions, harness configuration, and accessories to match specific project requirements and load geometries
Quality Inspection and Technical Support: Comprehensive quality control covering complete assembly with technical support for product selection, configuration, and documentation
Frequently Asked Questions
How is the required capacity of a Parachute Underwater Air Lift Bag determined?
Capacity should be established from the submerged weight of the load plus rigging weight, considering water depth, density, load geometry, attachment arrangement, environmental conditions, dynamic effects, and engineering margin. Dry weight alone is insufficient for final selection.
What material is normally used for Parachute Underwater Air Lift Bags?
High-strength coated polyester technical fabric is commonly used, with exact specifications selected according to required capacity, operating environment, and service conditions.
Can the lifting bags be reused after an underwater recovery operation?
Yes, when structurally serviceable and compliant with inspection requirements. After each operation, complete inspection, cleaning, thorough drying, proper folding, and suitable storage are required before subsequent deployment.
Can Hongruntong Marine customize the size and lifting configuration?
Yes. Diameter, height, buoyancy capacity, harness arrangement, lifting points, valve configuration, webbing dimensions, and other characteristics can be customized according to project requirements, particularly for irregular geometries or restricted access.
What inspection or certification documents can be provided?
Available documentation depends on product configuration and project specification. Product specifications, material information, inspection records, test documentation, and operating information can be discussed during technical review, with compliance to industry guidelines established beforehand.
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...
