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Pillow Lift Bags with Compact Structure and Reliable Sealing for Wide Underwater Applications

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Pillow Lift Bags with Compact Structure and Reliable Sealing for Wide Underwater Applications
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Features
Specifications
Thickness: 0.4mm-2.5mm, Or As Request
OEM: Warmly Welcomed
Layers: 1-6Ply, Or As Request
Warranty: 36 Months
Reinforcement: Nylon Fabric
Feature: Durable And Reliable Construction
Type: Cylindrical, Parachute, Pillow
Application: Salvage Operations, Underwater Construction
Valve: Inflation And Pressure Release
Packaging: Pallets, Wooden Box
Lifting Capacity: 200kg To 50 Tons
Material: TOP-Grade PVC Coating Fabric
Usage: Underwater Air Lifting, Salvage, Large Buoyancy
Standard: IMCA-D-016
Certificate: BV, ABS, DNV, LR, SGS, CCS
Color: Black, Yellow, Orange, Or As Request
Highlight:

Compact Structure Pillow Lift Bags

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Reliable Sealing Underwater Air Lift Bags

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Wide Application Inflatable Buoyancy Bags
Basic Infomation
Place of Origin: China
Brand Name: Hongruntong Marine
Certification: BV, ABS, DNV, LR, SGS, CCS, RMRS
Model Number: HM-AL12
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: 1580 Pcs Per Month
Product Description
Pillow Lift Bags: Compact Structure, Reliable Sealing, Wide Application for Underwater Lifting
Pillow Underwater Air Lift Bags are flexible underwater buoyancy systems designed for controlled lifting, temporary flotation, subsea installation, marine maintenance and recovery of submerged equipment. The pillow-shaped configuration provides a relatively wide flotation surface with a low-profile structure, enabling the bag to be installed beneath or alongside submerged loads where access is restricted and conventional rigid flotation equipment is impractical.
Product Overview
The product operates by introducing compressed air into a flexible enclosed chamber, causing the bag to displace surrounding water and generate upward buoyant force. The principal body is constructed from reinforced PVC-coated polyester fabric selected for mechanical strength, flexibility, abrasion resistance and suitability for marine environments.
The construction normally incorporates reinforced lifting points, load-bearing webbing, air inlet and outlet valves, pressure-control components and compatible hardware. The connection between the inflatable body and the lifting harness is particularly important because buoyancy generated inside the chamber must ultimately be transferred through the reinforcement and external rigging to the submerged load.
Case Study: Temporary Buoyancy Assistance for a 680-Ton Floating Dock
A ship repair company in Northern Europe was carrying out maintenance on a 680-ton floating dock that had developed an uneven submerged condition after seasonal ballast adjustment. One side of the structure had settled deeper than planned, creating excessive contact with the harbor bottom and making normal repositioning difficult.
The engineering team divided the affected area into several buoyancy zones and selected Pillow Underwater Air Lift Bags with dimensions suitable for the available clearance beneath the dock. The objective was to reduce the effective load transmitted to the seabed rather than to lift the complete structure entirely clear of the water.
After deployment and controlled inflation, the deeper side of the dock gradually rose as buoyancy increased. Operators adjusted the inflation sequence between individual bags to maintain a controlled attitude. This staged procedure reduced the uneven seabed loading and created additional clearance beneath the structure.
Pillow lift bag installation beneath floating dock structure Close-up view of pillow lift bag reinforcement and valves
Technical Specifications
Product Name Pillow Shaped Underwater Air Lifting Bag For Subsea Search And Rescue
Raw Material TOP-Grade PVC Coating Fabric
Type Cylindrical, Parachute, Pillow
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
Standard Model Specifications
Model Capacity (kg) Capacity (lbs) Length (mm) Width (mm)
HM-P100 100 220 1,020 760
HM-P250 250 550 1,320 820
HM-P500 500 1,100 1,300 1,200
HM-P1000 1,000 2,200 1,550 1,420
HM-P2000 2,000 4,400 1,950 1,780
HM-P3000 3,000 6,600 2,900 1,950
HM-P5000 5,000 11,000 3,230 2,030
*Note: Other sizes can be customized according to the requirements.
Key Features
  • Reinforced Coated-Fabric Pressure Chamber
    The inflatable chamber is manufactured from reinforced PVC-coated polyester fabric engineered to withstand internal air pressure, external hydrostatic pressure and mechanical handling. The polyester reinforcement acts as the structural textile layer, while the PVC coating provides the airtight surface required to retain the inflation medium.
  • Load Distribution Through Reinforced Harness Geometry
    The lifting harness transfers buoyancy from the flexible chamber into the external lifting arrangement. Reinforced webbing and dedicated lifting points distribute the force generated by the inflated bag and reduce localized loading on the fabric.
  • Pressure Management for Progressive Buoyancy Generation
    Pillow Underwater Air Lift Bags generate buoyancy through controlled air inflation rather than uncontrolled expansion. Progressive inflation allows the operator to observe how the submerged load responds, which is important when the load has uneven weight distribution.
  • Flexible Low-Profile Geometry
    The pillow configuration is engineered for applications where installation clearance is limited. A deflated bag can be folded into a compact package and passed through restricted access areas before being placed beneath the load.
Applications
  • Floating Dock and Barge Maintenance
    Provide temporary buoyancy assistance during maintenance of floating docks, pontoons, barges and work platforms. Multiple bags can be installed beneath structurally appropriate areas to reduce seabed contact.
  • Subsea Fabrication and Installation
    Assist with temporary support of fabricated steel structures, pipeline components and installation frames during subsea construction. The bags can be positioned underwater before inflation, making them suitable for restricted access areas.
  • Port Infrastructure and Marine Equipment Recovery
    Assist the recovery or repositioning of submerged machinery, pontoons, small vessels and structural components. The reusable construction is suitable for maintenance departments conducting recurring underwater work.
Why Choose Hongruntong Marine
  • Established Manufacturing Experience
    Over 30 years of manufacturing experience serving marine and industrial applications, providing practical knowledge of technical fabric products and marine environmental conditions.
  • Engineering Customization
    Support customized configurations based on project requirements including target buoyancy, submerged load, operating depth, available installation clearance and attachment points.
  • Controlled Production and Inspection
    Comprehensive quality control for inflatable lifting products with attention to pressure containment and mechanical load transfer, including seam quality and reinforced lifting points.
  • International Supply and Technical Communication
    Work with international marine customers and support communication throughout specification and procurement processes, including packaging and transportation coordination.
Frequently Asked Questions
Can Pillow Underwater Air Lift Bags operate in shallow and deep water?
They can be used at different underwater depths when the selected model is designed and rated for the intended operating conditions. Hydrostatic pressure increases with depth, affecting inflation behavior and available buoyancy. The operating depth should be specified during product selection.
How should the bag be positioned beneath a submerged structure?
The bag should be placed at structurally suitable support locations identified during the lifting assessment. Contact with sharp edges, cutting surfaces or abrasive structures should be avoided or controlled using appropriate protection.
Does a larger bag always provide a higher usable lifting capacity?
A larger volume generally provides greater theoretical buoyancy, but usable lifting capacity depends on the complete system. Bag weight, rigging weight, operating depth, water density, reserve buoyancy and structural attachment capacity must all be considered.
What maintenance is required after saltwater use?
The bag should be deflated and cleaned to remove salt, sand, mud and other contaminants. It should then be dried completely before storage. Fabric, welded seams, lifting harnesses, valves and hardware should be inspected for abrasion, cuts, corrosion or other deterioration.
Can Hongruntong Marine supply customized lifting points and valve arrangements?
Yes. The lifting-point layout, webbing arrangement and valve configuration can be discussed according to the intended lifting method. Customers should provide the required buoyancy, operating depth, load geometry and connection arrangement.
Pillow lift bag in operational deployment configuration Detailed view of pillow lift bag construction and materials Pillow lift bag quality inspection and testing process
Tag:

Inflatable Underwater Lift Bags

Parachute Lifting Bags

Underwater Pillow Bags

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Tel : +8618910539783
Fax : 86-10-89461910
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