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06/26/2025What Are Submarine Fenders?
Submarine fenders are specialized marine fenders used to protect submarines during docking by cushioning contact below the waterline. They come in two main types—hydropneumatic fenders and submarine foam fenders—and are part of the broader family of ship fenders and marine fenders that safeguard vessels and berthing structures.
submarine foam fenders
hydropneumatic fender
Why It Matters Now
Every submarine and naval port knows the critical cost of even minor collisions: hull dents, damaged sensors, drydock repairs, and mission delays. With fleets growing, berthing spots tightening, and budgets stretched, ports can’t afford overlooked details. Imagine a navy base in ice-covered waters relying on foam fenders or a deep-sea dock swapping expensive infrastructure for floating hydropneumatic protection. Using the right submarine fender is no longer optional—it’s necessary and urgent for fleet readiness and dock safety.
Featured Snippets
What are hydropneumatic submarine fenders?
Hydropneumatic fenders are rubber cylinders partially filled with air and water, with a ballast weight that keeps them vertical—designed to absorb energy gently and adapt to tidal changes during submarine berthing.
What are submarine foam fenders?
Submarine foam fenders are foam-filled elastomer cylinders with a concrete or steel counterweight, offering impact resistance and robustness—even in arctic conditions—without the risk of bursting.
Why choose submarine foam fenders?
Foam fenders are easy to install, puncture‑resistant, maintenance‑friendly, and proven in harsh climates—ideal for navy berths and ship‑to‑submarine mooring.
What You’ll Learn Next
- How both types differ in design and performance
- Choosing between hydropneumatic vs foam fenders (energy absorption, reaction force, maintenance)
- Installation best practices and real-world case studies
- Why NANHAI’s marine fenders and ship fenders stand out
Submarine Fender Types:
| Type | Design & Function | Best For |
|---|---|---|
| Hydropneumatic fenders | Rubber casing filled with air + water; ballast keeps vertical; energy absorption adjusted by air‑water ratio and pressure; low reaction force; custom sizes | Precision berthing, deep-water docks, changing tides, minimal hull load |
| Submarine foam fenders | Closed-cell foam core in reinforced skin; concrete/steel ballast; puncture-resistant, no burst risk; effective in ice-conditions | Harsh environments, simple installs, navy bases, ice-prone ports |
As part of NANHAI’s marine fenders and ship fenders lineup, both hydropneumatic and foam-based submarine fenders are essential components for any port aiming to reduce docking damage and maintenance costs.
Why Choose NANHAI?
- Tailored solutions: Custom-engineered hydropneumatic or foam submarine fender to match any hull type
- Proven reliability: Tested in extreme conditions—polar cold, deep-water pressure, high-energy mooring
- Cost-effective protection: Save on dock infrastructure while enhancing safety
- Expert support: Design guidance, installation training, and aftermarket service
Let’s Protect Your Fleet
Want to know which submarine fender fits your port best? Or curious about pairing them with our existing marine fenders or ship fenders? Reach out to NANHAI today. We’ll optimize your berthing operation—safely, smartly, and affordably.
FAQ
1. What energy absorption can hydropneumatic submarine fender achieve?
Hydropneumatic fenders can absorb substantial energy while maintaining minimal hull pressure. For example, a 1700 × 7200 mm unit (with ~65% water–35% air at 50 kPa) can absorb approximately 167 kJ, while keeping reaction force and internal pressure low.
2. How long do submarine foam fenders last?
Submarine foam fenders use closed-cell foam encased in reinforced elastomer. They are puncture-resistant and don’t deflate, offering a typical service life of 10+ years, often outlasting pneumatic options.
3. Which requires more maintenance: hydropneumatic or foam fenders?
Hydropneumatic fenders require periodic checks of air/water levels, safety valves, and pressure tests. In contrast, foam fenders need only visual inspections and occasional cleaning, significantly reducing maintenance effort.
4. Are submarine fenders compliant with international standards?
Yes—both hydropneumatic and foam submarine fender are designed and manufactured to meet ISO 17357-1:2014 standards, which cover material, burst pressure, energy absorption, and necessary safety testing.
5. Can submarine foam fenders be repaired?
Absolutely. Minor surface damage can be fixed on-site using polyurethane patching. More extensive wear on the skin can be addressed by factory reskinning, extending the fender’s lifespan .