logo
Home /Products/Underwater Air Lift Bags/Flexible Inflatable Underwater Air Lift Bags with Superior Buoyancy and Long Service Life for Marine Salvage

Flexible Inflatable Underwater Air Lift Bags with Superior Buoyancy and Long Service Life for Marine Salvage

1
MOQ
US$44-US$888
Price
Flexible Inflatable Underwater Air Lift Bags with Superior Buoyancy and Long Service Life for Marine Salvage
Features Gallery Product Description Request A Quote
Features
Specifications
Name: Underwater Air Lift Bags
Material: Top-Notch PVC Coating Fabric
Lifting Capacity: 200Kg To 50 Tons
Layers: 1-6Ply, Or As Request
Feature: Superior Buoyancy
Thickness: 0.4mm-2.5mm, Or As Request
Type: Parachute
Reinforcement: Nylon Fabric
Color: Black, Yellow, Orange, Or As Request
Valve: Inflation And Pressure Release
Usage: Underwater Air Lifting, Salvage, Large Buoyancy
Application: Salvage Operations, Underwater Construction
Highlight:

Flexible Inflatable Underwater Air Lift Bags

,

Superior Buoyancy Marine Salvage Lift Bags

,

Long Service Life Parachute Underwater Air Lift Bags
Basic Infomation
Place of Origin: China
Brand Name: Hongruntong Marine
Certification: ISO, BV, ABS, DNV, LR, SGS, CCS, RMRS
Model Number: HM-UALB9
Payment & Shipping Terms
Packaging Details: Wooden Pallets, Wooden Box
Delivery Time: 5-8 Work Days
Payment Terms: L/C,T/T,D/A,D/P,Western Union,
Supply Ability: 1454 Pcs Per Month
Product Description
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.
Marine salvage lift bag in operation during vessel recovery Underwater lift bag deployment configuration
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.
Marine lift bag technical details and construction Underwater lift bag deployment in marine environment Professional marine salvage equipment operation
Tag:

Inflatable Underwater Lift Bags

Parachute Lifting Bags

Underwater Pillow Bags

Recommended Products
Get in touch with us
Contact Person : Mr. William Lau
Tel : +8618910539783
Fax : 86-10-89461910
Characters Remaining(20/3000)
Get In Touch
C1-7, Xuhui Center, Jinguan North 2nd Street, Shunyi District, Beijing City, P.R. China 101300
sales@hongruntongmarine.com
+8618910539783
About
Company Profile Factory Tour Quality Control Contact Us
Products
Marine Rubber AirbagsMarine Salvage AirbagsInflatable Marine Airbags All Categories
Mail Us
Let us know your requirement. We will connect best products with you.
Sitemap │ Mobile Site │ Privacy Policy
China Good Quality Marine Rubber Airbags Supplier. © 2023 - 2026 Hongruntong Marine LLC.. All Rights Reserved.