US Navy Yokohama Electric Submarine Hydro Pneumatic Rubber Fender

 US navy yokohama electric submarine hydro pneumatic rubber fender  

The Hydropneumatic Fender is a special version of the Pneumatic Fender developed for submarines. They are filled with water and air then fitted with a counterweight that holds them upright against submerged hulls, Hydropneumatic Fender are designed to be installed vertically making them ideal for use with submarines or vessels whose impact point is likely to be below the waterline such as Catamarans, Semi-Submersible platforms and Drilling Rigs, protecting submarines and other vessels that make contact below the waterline.

JRB Hydropneumatic Fenders can be performance 'tuned' by varying the initial pressure, water to air ratio and ballast weights to suit the hull curvature and sensitivity of the latest submarines.

The Hydropneumatic fenders can be installed on most Quay structures and come in a range of sizes to suit the application and a range of vessels.

Advantages of JRB pneumatic fenders:

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SIZE * D	INITERNAL PRESSURE	BODY WEIGHT	SAFETY VALVE PRESSURE SETTING	TESTING PRESSURE	INITERNAL PRESSURE	BODY WEIGHT	SAFETY VALVE PRESSURE SETTING	TESTING PRESSURE
mm(D) * mm(L)	kpa	kg	kpa	kpa	kpa	kg	kpa	kpa
1700 *7200	50	940		200	80	1140		250
2000 * 6000	50	930		200	80	1100		250
2500 * 5500	50	1300	175	250	80	1460	230	300
2500 * 7700	50	1854	175	250	80	2030	230	300
2500 * 9100	50	2300	175	250	80	2480	230	300
3300 * 6500	50	2200	175	250	80	2520	230	300
3300 * 8600	50	3140	175	250	80	3350	230	300
3300 * 10600	50	4200	175	250	80	4700	230	300
4500 * 9000	50	5000	175	250	80	5500	230	300
4500 * 11000	50	5600	175	250	80	6100	230	300
4500 * 12000	50	7000	175	250	80	7600	230	300

​Please contact us directly about technicel questions on submarine fenders.

Notes: 1. Weight of the fender body and net torrence ± 10%

2. Reaction force torrence ± 10%

 

Yokohama Pneumatic Rubber Fenders are constructed of several layers of strong tire-cord, and are thus resistant to pressure and cutting. The safety factor adopted in the design of this fender is based on accepted theory and has been proven by extensive experimentation. Operational experience over a long period of time attests to its high safety and reliability, and hydraulic pressure tests have proven the strength to be suitable. Furthermore, large-size fenders are equipped with a safety valve to release the inside air in the event of accidental over-pressure. The figure below shows data obtained from many destructive pressure tests at various percentage compressions. Such data are used to establish a basic minimum endurable pressure (MEP) curve for pneumatic rubber fenders.

 

Advantages at Inclined Berthing

 

Ships usually make initial contact with the dock or another ship on STS operations at an oblique angle. In the case of solid rubber fenders or foam fenders, rated reaction force and energy absorption decreases considerably at inclined compressions compared with parallel compression. In order to compensate for the decrease of energy absorption at inclined compression, it is necessary to use larger sizes in the case of solid rubber fenders or foam fenders.

 

 

Adaptable to the Tide

 

Yokohama Pneumatic Rubber Fenders basically float on the water in an unrestricted vertical plane corresponding to the tidal range and ship's vertical movement. This means that energy absorption always takes place at the most suitable position, and that only one fender is required per dolphin.

Applications

 

In order to minimize the shipping cost of Yokohama Pneumatic Rubber Fenders, the fenders are usually packed and shipped in containers or on pallets in vacuumed and folded down state.