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What Are Hydro Pneumatic Fenders?

Hydro pneumatic Fenders are specialized variants of pneumatic fenders. These are mainly designed for submarine docking applications. These fenders contain a mixture of water and air, partially filling them. A counterweight at the bottom of the fender ensures it remains vertically afloat in the sea. This design ensures continuous and good protection of the submerged hull. The safety is due to the hydropneumatic fender.

Hydro pneumatic Submarine Fenders have a complex design compared to standard pneumatic fenders. They also require specific installation techniques. The efficiency of Hydropneumatic Fenders depends on factors. These include the air-to-water ratio, the counterweight’s mass, and the initial pressure setting. Jerryborg Marine welcomes your technical specifications for producing hydropneumatic floating fenders. Our produced fenders will be tailored in size and design to meet your operational needs.

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Advantages of Hydro Pneumatic Submarine Fenders

Cost-saving replacement solution for deep water berthing

Hydropneumatic fenders significantly reduce the construction costs associated with deep water berths. Unlike fixed docks, these fenders utilize a cushioning effect from water and air. So they don’t need expensive underwater infrastructure.

Quickly moved and high flexibility in berthing

These fenders are mobile. They can be adjusted for different ship types and requirements. Their flexibility allows for quick reconfiguration of berthing positions. So they can be at various locations and accommodate multiple vessels.

Easily transported to provide emergency docking facilities

These fenders can be quickly transported to needed areas in emergencies, such as after a natural disaster. Their usage and deployment are also instantaneous. Their portability makes it possible to provide temporary or emergency docking. They can do so on short notice.

Simple and low cost in installation and maintenance

Installing these fenders is straightforward and economical. They require simple anchoring systems and do not involve machinery or complex structures. It keeps maintenance costs low.

Unaffected by extreme climatic conditions

Durable by design, hydropneumatic fenders are not affected by extreme weather. They usually function in severe heat, cold, or under UV exposure. This functionality in harsh conditions ensures the continuous operation of berthing facilities.

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Hydro Pneumatic Rubber Fender Technical Specifications

This type of fender incorporates a protective sleeve. This sleeve shields its body from wear and the marine environment. Suspended by a guy chain, the fender hangs at the waterline level. It remains ready to interact with docking submarines. A counterweight weighs down the hanging chain. It keeps the fender vertical and stationary.

Inside the fender, a balance of air and water is maintained. This balance provides the necessary buoyancy and compression characteristics. The air above the water level allows the fender to compress under impact. It absorbs the energy when a submarine docks. The counterweight is present beneath the water. It balances the fender, ensuring it returns to its original position after deflection.

The fender is anchored next to a pier with a back panel. It protects the docked submarine from direct contact with the pier structure. Two factors determine the length of the fender. Those include the size of the vessels it serves and the sea depth at the installation site. The fender’s outer diameter is scaled to the size of the submarine. This ensures a safe and effective cushioning zone.

These specifications provide a resilient system. It can handle the substantial forces exerted by submarines during docking maneuvers. Their strength and durability protect both the vessel and the berthing structure.

Hydro Pneumatic Fender Design

The design of the Hydro Pneumatic Fender shows that it centers around a pressure vessel. This vessel is the core of the impact absorption capability.

A precise mixture of air and water fills this pressure vessel. It provides the necessary cushioning effect for docking vessels. The rubber packing encases the pressure vessel. It seals the internal environment and protects it from the corrosive sea air.

Operationally, a manual valve is present to adjust internal pressure. It also helps to accommodate various ship sizes and weights. A safety valve is also present. It prevents over-pressurization, which could cause equipment failure. Together, these components create a reliable system. The system is essential for protecting both submarines and the docks they use.

Submarine Pneumatic Fender Technical Parameter

Item	Without water 60% deflecction		Filled with water 45% deflection
Fender Size [mm]	Energy [kNm]	Reaction [kN]	Ratio water/air [%]	Energy [kNm]	Reaction [kN]
1,700 × 7,200	560	1810	65/35	134	611
2,000 × 6,000	647	1766	65/35	155	599
2,500 × 5,500	928	2037	65/35	223	687
3,300 × 6,500	1913	3169	60/40	616	1247
3,300 × 10,600	3120	5170	55/45	589	1275

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Hydro Pneumatic Fender Applications

Hydro Pneumatic Fenders are critical in submarine jetty applications. They mainly soften the impact between the vessel and the docking structure. In these settings, the fenders are positioned strategically. They match the water level and the submarine’s hull. In this way, they make a responsive barrier that can handle the mass and momentum of a docking submarine. The fenders’ air and water chambers work in concert to absorb shocks. They ensure the integrity of the vessel’s hull and protect the jetty from damage. This is particularly important for military and research submarines. The reason is that they require precision docking. The potential costs of any damage are also high.
Aside from submarine jetties, hydropneumatic fenders find utility in various maritime environments. They are easy to customize. So, they quickly fulfill the docking needs of oil tankers, cargo ships, and passenger ferries. They offer tailored berthing solutions for diverse marine operations.

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