When choosing which size of fender is to be employed, one should select an appropriate size which ensures that the kinetic energy applied, either between vessels or a vessel and berthing, may be absorbed by a single fender. Of course, the best method is to use several smaller fenders in order to distribute contact energy however, one must take into account that simultaneous contacting of all fenders does not always take place.
| Size |
Fender Body Weight |
Performance | ||||
| Dia. |
Length |
Initial Inner Pressure of 0.3Kg/cm² (60% deflection) |
Initial Inner Pressure of 0.5Kg/cm² (60% deflection) |
|||
| Reaction Force |
Energy Absorption |
Reaction Force |
Energy Absorption | |||
| mm |
mm |
Kg |
ton |
ton-m |
ton |
ton |
| 300 |
500 |
8 |
2.0 |
0.10 |
2.3 |
0.13 |
| 600 |
10 |
2.4 |
0.12 |
2.7 |
0.15 | |
| 500 |
800 |
24 |
5.4 |
0.42 |
6.0 |
0.58 |
| 1000 |
32 |
6.8 |
0.52 |
7.5 |
0.73 | |
| 800 |
1200 |
55 |
13.0 |
1.60 |
14.4 |
2.20 |
| 1500 |
70 |
17.0 |
2.00 |
19.0 |
2.80 | |
| 1000 |
1500 |
90 |
20.0 |
3.20 |
22.6 |
4.10 |
| 2000 |
120 |
27.0 |
4.20 |
30.1 |
5.50 | |
| 1200 |
1800 |
145 |
30.0 |
5.50 |
32.6 |
7.10 |
| 2000 |
160 |
33.0 |
6.00 |
36.1 |
7.90 | |
| 1500 |
2500 |
250 |
51.0 |
12.00 |
56.5 |
15.50 |
| 3000 |
300 |
60.0 |
14.00 |
67.1 |
18.60 | |
| 2000 |
3000 |
400 |
81.4 |
24.00 |
90.0 |
33.00 |
| 3500 |
480 |
95.0 |
28.00 |
105.0 |
38.50 | |
| 6000 |
800 |
162.9 |
48.0 |
180.0 |
66.00 | |
| 2500 |
4000 |
900 |
130.0 |
50.00 |
151.0 |
68.80 |
| 5500 |
1250 |
178.8 |
68.80 |
207.6 |
94.60 | |
| 3300 |
6500 |
2100 |
300.0 |
150.00 |
323.0 |
195.00 |
Excellent Compressibility & Elasticity
Unlike the general rubber fenders, which use the elasticity of the material, pneumatic fenders utilise the compressibility and elasticity of air. Therefore, shock absorption rates are substantially upgraded.
Low Reaction & High Absorption Energy
Pneumatic fenders art designed to absorb kinetic energy. Consequently, the more energy that is absorbed, the more efficient the fender. However, the fender also works most effectively when reaction forces are reduced, in order to prevent the ship's side from being deformed or to protect the quay against damage. Our fenders meet both these requirements.
Fenders with Low Surface Pressure
These types of fenders should have small surface reaction and high absorption energy. The surface pressure on our fenders is equal to the internal pressure, which is far below 15 ton/m². This is the lowest surface pressure of all fender types and contact utilising air pressure provides completely uniform surface pressure, unlike other fender models.
Good Buoyancy & Simplified Handling
Pneumatic fenders are naturally buoyant and therefore sit at the appropriate working height without being affected by tidal range. Moreover, they are much lighter and easier to handle than conventional solid rubber models, due to their hollow construction.
Ease of Installation & Repair
As a result of excellent buoyancy, pneumatic fenders can be moored to either vessel or quay with a chain or wire line. Following serious damage they can easily be repaired and reinstalled and maintenance cost are therefore dramatically reduced. All pneumatic fenders are supplied with an appropriate repair kit free of charge.
Maximum Possible Service Life
Our pneumatic fenders have prolonged service life due to a unique construction using strong tire cord and nylon duck. The rubber used is lightly resistant to cutting and weathering and may be covered by a protective net if required.
Our pneumatic fenders consist of 3 layers; an inside rubber layer, a reinforcing cord layer and a rubber surface layer.
Rubber Surface Layer
Thick rubber is adhered externally in order to protect the foundation of the pneumatic fender. This is highly resistant to cutting, harsh weather and seawater.
Reinforcing Cord Layer
This foundation layer uses strong tire cord, synthetic fabric and rubber. The numbers of piles are designed to ensure sufficient pressure depending on service conditions and size and type of fender.
Inside Rubber Layer
The inside rubber layer consists of an excellent airtight compound with strong adhesive properties.
Valve
A valve is provided at one end of the fender for air injection. Larger size fenders are equipped with a safety valve for releasing excess internal pressure.
Vulcanising & Air Leakage Test
The above components are mould vulcanised, as one body, under high pressure following assembly. This provides perfect and strong adhesion. Furthermore, all items are subject to air leakage tests prior to shipment.
Pneumatic fenders may be secured by means of a wire or chain net to protect the rubber surface body. The net is covered with rubber sleeves to eliminate paint scratching or hull damage. For large size fenders rubber tires are attached to the nets, or the body of the fender is wrapped in a protective cover.
Cleaning
Prior to storage or long periods where the fender is not to be used, the rubber surface should be washed with fresh water. Any oil slicking should be similarly removed with soapsuds.
Control of Internal Pressure
During periods of storage air should be released, using the valve, to slightly reduce the internal pressure of the fender as excessive pressure may be caused by rises in atmospheric temperature.
Other Advice
When not in use ensure that, as far as possible, the fender is stored in a dry and cool place and that direct contact with sunlight, heat sources, grease, machinery oil or other substances that may damage the material is avoided.
Repair
Temporary repair of these fenders can be carried out, with the kit provided, in cases where partial peeling of the material is evident. It is suggested that a detailed inspection is conducted on fenders every 12 months. Where necessary we would also advise full repair by means of complete vulcanisation by a reputable rubber manufacturer.
If you require help / more information on any of our products or services please do not hesitate to Contact Us.