Heavy Duty Ship and Boat Floating Dock Inflatable Boat Rubber Ship Airbag/Working pressure 0.05 to 0.15 MPa/Certificate CCS / BV / ISO9001 etc.

Heavy Duty Ship and Boat Floating Dock Inflatable Boat Rubber Ship Airbag
 
Rubber airbag also known as marine airbag, ship launching airbag, lifting rubber airbag , ship salvage airbag, inflatable airbag, boat lift air bag, air balloon, made by rubber & multi layer of rubber-dipped tyre fabric.
Rubber airbags are widely used in launching and landing ship/ boat/vessel, lifting and moving heavy goods, salvaging stranded boats. Marine airbags are very popular with shipyard, ship owner, and marine supplies company now.

Product Description:

Material Advantages:
1. Core Material and Structural Advantages
Main Rubber Compound: Utilizes a blend of natural rubber and styrene-butadiene rubber (total rubber content ≥75%), enhanced with high-wear-resistant carbon black, anti-aging agents, and tear-resistant additives. With a Shore hardness of 65-75HA, it combines high elasticity and exceptional toughness to withstand repeated deformation and friction under heavy vessel loads.
Reinforcement Design: Incorporates 8-16 layers of 1870D/2 high-strength nylon cord fabric secured via cross-winding technology. Specialized rubber adhesive applied between layers ensures bond strength ≥4.0kN/m and tensile strength ≥3000N/5cm. This guarantees uniform radial pressure distribution, enabling a maximum working pressure of 0.3MPa.
Sealed Anti-Sinking Structure: Features an internal butyl rubber sealing layer with a 24-hour leakage rate ≤1.5%. Paired with an integrally vulcanized hemispherical end cap, it eliminates joint gaps. Select models can be filled with closed-cell polyurethane foam, preventing sinking even if the rubber layer is damaged, enhancing operational safety.
Compatible accessory materials: Inflation valves and nozzles are made of corrosion-resistant 316L stainless steel. Lifting slings and reinforcement straps use high-strength polyester fiber with rubber sleeves to prevent abrasion damage to the airbag.
Manufacturing Process:
 
Raw Material Compounding and Sheet Preparation: Natural rubber, butyl rubber, carbon black, anti-aging agents, and other raw materials are fed into a closed mixer in specified proportions. Compounding is performed at 120-150°C until uniformity is achieved. The mixture is then calendered into sheets of uniform thickness for inner tubes, outer tires, and cord fabric laminated sheets.
Reinforcement Layer Forming: Polyester cord fabric is wound circumferentially around the tire carcass. Specialized rubber adhesive is applied between each layer to ensure strong interlayer bonding. Tension is uniformly controlled during winding to prevent wrinkles that could compromise pressure-bearing performance.
Bladder Vulcanization: Employing large-scale autoclave vulcanization, the wound bladder carcass is placed into a custom mold. Vulcanization occurs at 150-160°C and 0.8-1.0 MPa pressure for 4-6 hours, achieving complete rubber cross-linking and curing to form an integrated structure.
End Cap Sealing and Valve Installation: Molded end caps are thermally vulcanized to the bladder body, with additional reinforcement through 3-5 layers of cord fabric winding at the joint. Install copper inflation valves and safety valves, followed by airtightness testing (inflate to working pressure, maintain for 24 hours; leakage rate ≤3%).
Finished Product Inspection: Conduct hydrostatic burst testing (at 1.5 times working pressure), load-bearing performance testing (simulating vessel weight loading), verify dimensional tolerances (diameter deviation ≤ ±5mm, length deviation ≤ ±10mm), and inspect surface quality. Units are released from the factory only upon passing all inspections.

 

Features:

Exceptional Load-Carrying Capacity: Individual airbags typically measure 1.2–2.0m in diameter and 8–15m in length, with buoyancy ranging from 80 to 200 tons per unit. Multiple units can be combined to accommodate heavy vessels under 5,000 tons (e.g., bulk carriers, tankers, engineering vessels) during docking and undocking operations, with a safety factor ≥3.5.
Adaptable to Floating Dock Conditions: The flexible structure conforms to the curved surfaces of floating dock decks and hulls, distributing vessel weight to prevent localized stress concentration that could damage the hull or dock. Once inflated, it maintains high stability, withstanding 3-4 Beaufort scale winds and waves, ensuring stable posture during dock lifting, lowering, and lateral movement.
Efficient and Convenient Operation: Inflation takes only 40-80 minutes (depending on specifications). Deflated units fold for storage, eliminating the need for heavy equipment during transport and deployment. A remote pneumatic control system enables precise, synchronized adjustment of multiple airbags, ensuring smooth ship transfers or docking/undocking.
Weather-Resistant Durability: Rubber layers resist seawater corrosion and UV aging, with a service life of 8-12 years under normal conditions. Anti-slip patterns on the outer surface minimize relative slippage between vessels and airbags, adapting to marine and inland waterway environments.
Compliance Assurance: Meets GB/T 20858-2017 “Marine Air Cushions” and ISO 14409 standards, certified by classification societies including CCS and ABS, fulfilling safety requirements for floating dry docks and heavy-lift vessel operations.

 

Technical Parameters:

Applications:

Heavy-Duty Floating Dry Dock for Vessel Launching and Hauling: As the core load-bearing component of the floating dry dock, multiple airbags are evenly distributed across the dock deck. When inflated, they lift the vessel, working in conjunction with the dock's lifting system to facilitate vessel launching, docking, maintenance, and servicing operations.
Vessel Transposition and Positioning: Within floating dry docks or port terminals, vessels are lifted via inflated airbags to enable lateral or longitudinal movement, precisely adjusting berthing positions for ship assembly, component replacement, and related operations.
Floating Dock Auxiliary Protection: Installed along the dock's perimeter as collision buffers, these prevent hard impacts during vessel berthing, safeguarding both the dock structure and the ship's hull paintwork.
Emergency Rescue Operations: When vessels run aground near floating docks or experience hull inclination, rapidly inflate the airbags to provide buoyancy, assisting vessels in escaping hazardous situations or adjusting hull orientation for subsequent rescue operations.

Support and Services:

After-sales consultation: We provide 24/7 customer service to answer customer questions , such as specification selection, usage methods, and maintenance points.
Regular follow-up visits: The manufacturer may conduct regular follow-up visits to customers to understand the usage and collect customer feedback in order to continuously improve product quality and service levels.
Maintenance guidance: The manufacturer or professional organizations will provide customers with maintenance guidance, including regularly checking for deformation, rust, ; applying rust-preventive oil or corrosion inhibitors after cleaning; and lubricating .
 
 
with its excellent quality and attentive service, builds a solid guarantee for your maritime career. Choosing us means choosing safety, efficiency, and worry - free operation. Embark on a new journey of navigation, starting from choosing our product!
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