The Inflatable Fender for Dock is a rubber sealed container made of hanging rubber curtain fabric as the skeleton material. You can rest assured to buy this product from reliable manufacturer, Aorunda.
After the ball is filled with compressed air, it can float on the water surface and serve as an important buffering medium for ship to ship (STS) and ship to dock (STD) berthing. At the same time, inflatable rubber balls can absorb the impact energy of ship movement, reduce the ship's recoil force, and greatly improve the safety of ship berthing.
The absorption of impact energy is large, but the anti impact force on the ship is small;
1. Easy installation
2. Good elasticity and will not deform under compression.
3. Lightweight, practical and economical;
4. The inclined compression performance does not decrease.
5. Specifications can be made according to customer requirements, with a long service life
6. Adopting chain hanging, easy to move; The chain and tire mesh can be chosen by oneself to increase the service life of the fender
7. Widely used, including oil tankers, container ships, yachts, offshore platforms, large shipyards, military ports, large bridge piers, etc.
Usually used in ship to ship, ship to wharf cargo transfer, docking and other occasions; Due to its self floating characteristics, our inflatable fender is particularly suitable for installation at docks with significant changes in tide levels.
(1) The Inflatable Fender for Dock uses high-quality natural rubber as raw material, and various auxiliary materials such as styrene butadiene rubber are added at the same time. The formula is reasonable, so that it has durable anti-aging ability and wear resistance. The rubber content of the ball can reach over 50%, and the tensile strength of the rubber exceeds 20Mpa.
(2) The skeleton material of the inflatable rubber ball is made of high-quality nylon impregnated curtain fabric with single strands and three strands, and the breaking strength of a single curtain fabric reaches 313.6N, greatly improving product performance and service life.
(3) Due to the long-term operation of the ball in seawater, it is more susceptible to seawater erosion. Therefore, the flange used for the gas rubber ball needs to undergo anti-corrosion treatment, and all accessories are made of stainless steel material to ensure the improvement of the ball's service life and reduce maintenance frequency.
(4) Advanced 3D animation simulation technology can be utilized to conduct simulation experiments on the docking speed, buffering force, collision direction, etc. between ships (ships and docks) during docking, in order to calculate the maximum force factor on the docking ball and obtain the most reasonable structural layout. Effectively ensuring the protection and safety of the vessel.
The protective cover type inflatable rubber relies on the ball and carries a layer of sheath on the surface of the ball, which is composed of a chain, steel wire rope or nylon rope net, and old tires (or rubber sleeves). The longitudinal break point of the chain, steel wire rope or nylon rope net is connected to one or two adjacent mesh of the net cover with a cable or pull rope. The net cover will be attached with old tires or rubber sleeves to provide protection for the ball body.
Type I - Protective sleeve type inflatable rubber ball support features:
(1) The surface of the chain is heat-treated, which can effectively enhance its resistance to seawater corrosion.
(2) The use of nylon rope makes ball installation simple and easy to transport.
(3) The tires on the mesh cover can provide sufficient space between the fender and the hull, thereby protecting the fender from wear and extending its service life.
Suspension type inflatable rubber ball refers to a ball that is not covered by a mesh tire sheath on the surface. This type of ball has lifting and rotating devices on both sides for easy movement, while also allowing the ball to rotate more flexibly during operation to cope with various angles of impact.
Ship rubber fenders play a crucial role in ship to ship berthing and ship to dock berthing. Customers should accurately calculate the selection of port fenders
Through years of practical experience in berthing protection and customer feedback, Aorunda understands that selecting the right berthing ball is not only about specifications, but also about finding a balance between physical performance and cost safety in complex operating environments. We have identified the following five core dimensions for the application of inflatable rubber balls, which are provided for reference by Guangzhou Shipyard East and dock owners:
The primary criterion for selection is maximum energy absorption. It is necessary to ensure that the docking ball can effectively buffer the huge kinetic energy of the ship when berthing. But at the same time, attention must be paid to the reaction force it generates. If the reaction force is too strong, even if the ball is not damaged, the side of the ship or the dock structure may still be damaged. Experience tells us that the ideal state is to choose a configuration with low reaction force as much as possible while meeting the upper limit of energy absorption, in order to achieve "soft landing" protection for the hull.
The safety of homework often depends on the standoff distance. This not only involves the minimum safety clearance when two ships dock together (STS), but also concerns the maximum effective operating radius after the ships dock at the terminal (STG). We suggest that customers reserve the remaining thickness space after being compressed by the ball when calculating, to prevent accidents of "hard hitting" under extreme compression.
The saying 'a big ship with a big ball' is common sense, but the details determine success or failure. In addition to the total tonnage of the vessel, it is also necessary to consider the shape of the contact surface of the hull (such as the length of the straight section) and the distribution of force points. Ships with different displacements have vastly different force responses to docking balls, and precise tonnage matching is a prerequisite for preventing abnormal damage to docking balls.
Inflation relies essentially on the internal air pressure of the ball. Temperature changes can directly cause internal pressure fluctuations - summer exposure may cause overpressure, while winter or cold sea areas may cause the ball to "soften" and result in insufficient energy absorption. In addition, frequent wind and waves will increase the frequency of ship shaking and friction, which puts higher dynamic load requirements on the wear resistance of the outer layer of the ball and the strength of the sheath (chain tire net).
Message from the Technical Department:
Safe berthing is no small matter. In practical selection, we recommend comparing multiple options based on actual sea condition data and ship parameters, and not blindly pursuing a single high indicator.
| Ship weight（DWT) | Supposed speed of ship to dock（M/S） | Effective sport energy（KN.M) | Fender size D*L （m） |
| 200000 | 0.15 | 1890 | 3.3*6.5 |
| 150000 | 0.15 | 1417 | 3.3*6.5 |
| 100000 | 0.15 | 945 | 3.0*5.0 |
| 85000 | 0.17 | 1031 | 3.0*6.0 |
| 50000 | 0.18 | 680 | 2.5*5.5 |
| 40000 | 0.20 | 672 | 2.5*5.5 |
| 30000 | 0.22 | 609 | 2.5*4.0 |
| 20000 | 0.25 | 525 | 2.5*4.0 |
| 15000 | 0.26 | 425 | 2.5*4.0 |
1. The maximal energy E
2. The reaction R
3. Distance request for ship to ship or ship to dock, including max distance and min distance
4. The wave and other factors in actual using environment
5. The calculative formula of academic sport energy when ship to dock
E=1/2 boat tonnage*the additional modulus of boat quality*the square of speed for ship to dock*the eccentric modulus when ship to docks
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