Qingdao Aorunda is a dedicated manufacturer specializing in the R&D, production, sales, and export of military-grade submarine fenders. We operate modern, standardized production workshops equipped with large-scale high-pressure vulcanization machinery and comprehensive material testing laboratories.
Our products are manufactured in strict accordance with international maritime standards, classification society specifications, and military procurement requirements. We have a long-standing track record of supplying high-quality protective equipment designed specifically for submarines to naval ports, research institutes, and offshore engineering organizations. Customization and volume supply options are available.
The vertical, hydro-pneumatic inflatable fender designed specifically for submarines is a specialized anti-collision system independently developed by Qingdao Aorunda. It addresses the unique characteristics of submarines, such as deep drafts, fully submerged hulls, and precision-engineered pressure hulls.
Conventional ship fenders are typically air-filled floating units; they suffer from drawbacks such as a tendency to drift or tip over, a lack of underwater protection, high reaction forces, and a risk of scratching the submarine's hull coating. Consequently, they fail to meet the rigorous protection standards required for submarine berthing, dry-docking, and mooring.
Aorunda’s submarine fenders utilize a dual-medium (water and air) filling system combined with a vertical, bottom-weighted stabilizing structure. This design ensures comprehensive protection across the waterline, safeguarding both the above-water and submerged sections of the hull. Offering gentle cushioning, superior stability, and high safety, these fenders are the preferred protective equipment for submarine berths in naval ports and terminals for deep-sea submersibles.
The submarine fender is constructed from a blend of imported natural rubber and specialized deep-sea, corrosion-resistant rubber. It features a seamless, integrated winding of multi-layer high-strength nylon cord fabric and is formed through a single-stage, high-temperature vulcanization process.
• Resistant to seawater corrosion, salt spray, and deep-sea high pressure; highly resistant to aging.
• Excellent airtightness and watertightness; remains free from leakage, cracking, or deformation during prolonged immersion.
• Highly adaptable to extreme temperatures; suitable for complex operating conditions in both coastal and deep-sea environments.
All metal fittings are made of 316L stainless steel, completely eliminating issues such as rust, breakage, or water ingress, and meeting long-term military-grade operational standards.
The upper section is filled with air and the lower section with water; the air provides energy absorption and cushioning, while the weight of the seawater stabilizes the vertical orientation, resulting in gentler cushioning and superior energy absorption.
Equipped with a corrosion-resistant ballast system, the fender maintains a strictly vertical position. It remains unaffected by tides, ocean currents, wind, or waves, ensuring constant, close contact with the submarine hull without shifting or tipping over.
The seamless, unitary construction offers high structural integrity and pressure resistance. Water and air filling operations are straightforward, allowing a single operator to complete the task quickly.
Featuring a vertical design that spans the waterline, our fenders cover both the above-water hull and the underwater pressure hull, making them suitable for all scenarios—including docking, mooring, dry-dock maintenance, and temporary anchorage.
Utilizing a flexible liquid-air cushioning system, the fenders evenly disperse impact forces, effectively protecting the submarine's anti-corrosion coating, pressure hull, and sensitive external detection equipment.
Designed for open waters, significant tidal ranges, and complex current conditions, these fenders provide stable, reliable impact protection specifically for military submarine berths.
They can be permanently installed at berths or deflated and folded for compact storage and rapid transport, making them ideal for mobile support and emergency protection missions.
Manufactured using military-grade vulcanization processes, the fenders offer a service life of 12–15 years under normal seawater conditions; they require no frequent refilling of air or water, significantly reducing port operation and maintenance costs.
• Compliance Standard: ISO 17357-1:2014 (International standard for marine fenders)
• Certified by multiple classification societies (e.g., CCS, BV) and verified through comprehensive third-party performance testing
• Capable of conducting various tests, including burst pressure, hydrostatic pressure, and airtightness assessments
• Meets acceptance criteria for military projects; full documentation, certificates, and test reports are available upon request
• Standard diameters: 600 mm – 3,200 mm
• Standard lengths: 1,200 mm – 6,000 mm
• Operating depth: 0–300 m (near-shore and near-deep-sea environments)
• Optimal compression deflection: 45%
• High safety redundancy and strong impact resistance
• Compatible equipment: Small scientific submersibles, unmanned underwater vehicles (UUVs), and military submarines of various tonnages
Customized, non-standard specifications are available.
▷ Anti-collision protection for submarine berthing, mooring, and dry-docking at naval bases
▷ Berth protection for deep-sea manned submersibles and scientific research/exploration submersibles
▷ Docking protection for large unmanned underwater vehicles (UUVs) and specialized underwater operational equipment
▷ Underwater anti-collision systems for semi-submersible platforms and specialized offshore engineering equipment
▷ Export-oriented support for domestic and international military-industrial maritime projects and port expansion/renovation works
1. Direct manufacturing and sales (factory-direct); no middlemen, ensuring controllable quality and reliable delivery schedules.
2. Fully customized dimensions and counterweights tailored to specific submarine tonnage, dock operating conditions, and water depth.
3. Comprehensive services including on-site surveys, solution design, technical guidance, and installation training.
4. Robust warranty and lifetime technical support; capable of long-term partnership for military-grade supply requirements.
