Yokohama pneumatic fender

What is pneumatic fender?

Pneumatic fenders are also called floating rubber fenders. They were first developedby Japanese Yokohama Rubber Company in 1958, so some people also call it Yokohama fender or Yokohama pneumatic fender. Pneumatic rubber fender is an upgraded product of ship-to-ship or ship-to-dock floating fender which is widely used in the marine anti-collision filed. It applies compressed air as buffering medium, making the ships have softer reaction force in STS operation or mooring process. Compared with general elastic rubber fenders (such as waste tires, solid rubber fenders, etc.), the floating Yokohama pneumatic fender has large guaranteed energy absorption, low unit area pressure acting on ships, excellent impact resistance and easy to install.  All Jerryborg’s Yokohama type pneumatic fenders are manufactured and tested fully compliant to ISO 17357-1:2014 standard.

Pneumatic Rubber Fender Structure

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Pneumatic floating fender is mainly composed of inner rubber, synthetic-tyre-cord layer for reinforcement, outer rubber and other metal parts. All the floating fender parts are combined as a whole after high temperature vulcanization, therefore the floating pneumatic fenders have many advantages, such as high strength, high fatigue and impact resistance, heat stability, good adhesion.

The inner rubber of Jerry Marine pneumatic fender is made of 5mm thick natural rubber plate to guarantee the air tightness of the pneumatic fender, thus the pneumatic fender can work very well without obvious decompression under long time use.

The outer rubber of Jerry Marine pneumatic fender is made of strong rubber material to withstand exterior pressing force and protect the pneumtic rubber fender from abrasion, offering hard usage under rough weather conditions.

The synthetic-tyre-cord layer of Jerry Marine pneumatic fender is high strength rubberized synthetic fabric made from chinlon tyre cord. 

Jerryborg Marine’s synthetic tyre cord layers are innovatively designed at ideal angles to evenly distribute the pressure acting upon the pneumatic fender. Integrative twining technology are applied to provide strength and hold the internal pressure during STS or STD operation.

Advantages of Jerryborg Marine Pneumatic Fenders

  • 1.Safety and reliability
  • 2.No deterioration or variation in STS operation or STD process
  • 3.Good performanceat inclined berthing
  • 4.Most cost-competitive fendering system
  • 5.Soft reaction force toships and jetty structures
  • 6.Lower mooring forces under rough weather conditions
  • 7.Stronger against shearing force
  • 8.Adaptable and self-floating to the tide.
  • 9.Simple and low cost in installationand maintenance.
  • 10.Low delivery and shipping cost.

Pneumatic Rubber Fender Types

Type I: Sling Pneumatic Rubber Fender

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Type II: pneumatic fender with tire & chain net

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Type III: Hydropneumatic fender

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Two Main Production Technology of Pneumatic Fender

Integrative twining technology

The wrapped pneumatic rubber fenders are manufactured by interactively overlap-twining technique. Artificial production process take up most of the manufacturing tiem and cost, so they are also called manual pneumatic fenders. Although surface finish of manual type pneumatic fenders are not as smooth as molded Yokohama pneumatic rubber fenders, raw materail and usage performance all comply with ISO 17357-1:2014 standard.

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Molded Production Technology

Just as its name implies, molded pneumatic fender is made in a specific split mold customized according to different pneumatic rubber fender models and sizes. Surface finish of molded Yokohama pneumatic fender is smoother than integrative twined manual type pneumatic rubber fender. Safety valve type is also diffferent from manual pneumatic fender.

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Yokohama Pneumatic Fender Standard Sizes

IP50 Performance Pressure (at GEA) kPa Pressures Body Thickness mm Mooring Chain Diameter mm
Dia. × Length (mm) Energy (GEA) kJ Reaction (at GEA) kN Pressure (at GEA) kPa Body Only kg Chain Net (e×cl body) kg Sling Type Relief Valve kPa Proof Test kPa
Ø300 × 600L 0.5 24 134 15 20 200 12 13
Ø500 × 1000L 6 64 132 24 121 35 200 12 16
Ø600 × 1000L 8 74 126 28 132 39 200 12 16
Ø700 × 1500L 17 137 135 50 165 60 200 13 16
Ø800 × 1500L 24 158 132 64 280 72 200 14 16
Ø1000 × 1500L 33 182 122 80 220 107 200 14 16
Ø1000 × 2000L 46 257 132 97 242 124 200 14 16
Ø1200 × 3000L 109 482 134 250 435 280 200 14 16
Ø1350 × 2500L 104 427 130 220 385 264 200 15 16
Ø1500 × 2500L 125 464 126 243 484 287 200 16 19
Ø1500 × 3000L 156 579 132 275 583 319 200 16 19
Ø1500 × 4000L 230 815 130 330 690 380 200 16 19
Ø1700 × 3000L 195 639 128 319 638 363 200 16 19
Ø1700 × 7200L 516 1621 133 760 N/A 810 200 16 22
Ø2000 × 3000L 260 727 122 403 990 469 200 16 22
Ø2000 × 3500L 314 875 128 445 1056 502 200 17 22
Ø2000 × 4000L 361 1020 125 490 1150 540 200 16 22
Ø2000 × 6000L 611 1631 136 658 1650 720 200 16 26
Ø2500 × 4000L 676 1381 137 992 1364 1188 175 250 18 26
Ø2500 × 5500L 962 2019 148 1199 2035 1452 175 250 18 32
Ø2500 × 9100L 1631 3482 140 2150 3467 2230 175 250 18 32
Ø3000 × 5000L 1136 2021 154 1520 1800 1640 175 250 19 32
Ø3300 × 4500L 1198 1884 130 1606 1881 2024 175 250 20 36
Ø3300 × 6500L 1850 3015 146 2057 2827 2475 175 250 20 38
Ø3300 ×10600L 3128 5257 158 2816 5126 3366 175 250 22 48
Ø4500 × 7000L 3302 3796 133 3740 4290 3880 175 250 24 48
Ø4500 × 9000L 4847 5747 146 4334 5929 175 250 24 50
Ø4500 ×12000L 6602 7984 154 5269 7689 175 205 24 58

Figures on the table comply with ISO 17357-1:2014.

Weight of fender body and net may vary ±10%. Net weights are based on JerryborgMarine’s standard design.

Special sizes are available on request simply contact us.

IP80 Performance Fender Weight Pressures Body Thickness mm Mooring Chain Diameter mm
Dia. x Length (mm) Energy (GEA) kJ Reaction (at GEA) kN Pressure (at GEA) kPa Body Only kg Chain Net (e×cl body) kg Sling Type Relief Valve kPa Proof Test kPa
Ø300 × 600L 0.6 17 20 250 13 13
Ø500 × 1000L 8 85 174 26 121 37 250 13 16
Ø600 × 1000L 11 98 166 30 132 42 250 13 16
Ø700 × 1500L 24 180 177 52 165 63 250 14 16
Ø800 × 1500L 31 204 180 71 280 83 250 15 16
Ø1000 × 1500L 45 239 160 84 220 111 250 15 16
Ø1000 × 2000L 64 338 174 101 242 129 250 15 16
Ø1200 × 2000L 89 390 166 149 352 176 250 15 16
Ø1200 × 3000L 140 623 185 275 435 310 250 16 16
Ø1350 × 2500L 144 561 170 226 385 270 250 17 16
Ø1500 × 2500L 174 610 166 268 484 312 250 17 19
Ø1500 × 3000L 218 761 174 339 583 355 250 17 20
Ø1500 × 4000L 296 1053 176 363 690 378 250 17 20
Ø1700 × 3000L 272 840 168 348 638 392 250 17 20
Ø1700 × 7200L 668 2096 170 795 N/A 845 250 18 22
Ø2000 × 3000L 363 955 160 413 990 479 200 19 22
Ø2000 × 3500L 438 1150 168 454 1056 520 250 19 24
Ø2000 × 4000L 520 1380 173 505 1150 535 250 19 24
Ø2000 × 6000L 791 2109 170 724 1650 810 230 300 18 28
Ø2500 × 4000L 944 1815 180 1111 1364 1309 230 300 20 30
Ø2500 × 5500L 1343 2653 185 1670 1800 1850 230 300 21 34
Ø2500 × 9100L 2293 4505 199 2360 3467 2450 230 300 20 38
Ø3300 × 4500L 1673 2476 171 1892 1881 2299 230 300 22 34
Ø3300 × 6500L 2583 3961 191 2420 2827 2827 230 300 22 42
Ø3300 ×10600L 4366 6907 208 3333 5126 3872 230 300 23 54
Ø4500 × 7000L 4608 4988 174 4136 4301 4350 230 300 26 54
Ø4500 × 9000L 6766 7551 192 4818 5929 230 300 26 58
Ø4500 ×12000L 9218 14490 202 5863 7689 230 300 26 58

Figures on the table comply with ISO 17357-1:2014.

Weight of fender body and net may vary ±10%. Net weights are based on JerryborgMarine’s standard design.

Special sizes are available on request simply contact us.

Properties of Outer and Inner Rubber Material

No.

Test Item

Test Method

Required Value
Outer RubberInner Rubber
1Before Aging————-————-
1-1Tensile StrengthISO 37 : 2005≥18 MPa≥10 MPa
1-2ElongationISO 37 : 2005≥400 %≥400 %

1-3

Durometer

Hardness

(A type)

ISO 7619 1 : 2004

ISO 7619-1 : 2004

60 ± 10

60 ± 10

50 ± 10

50 ±10

2

After Aging

ISO 188 : 2007

Air oven aging 70±1 , 96 hAir oven aging 70±1 , 96 h
2-1Tensile StrengthISO 37 : 2005Not less than 80% of the original propertyNot less than 80% of the original property
2-2ElongationISO 37 : 2005Not less than 80% of the original propertyNot less than 80% of the original property
2-3

Durometer

Hardness (A type)

ISO 37 : 2005Not to exceed the original property by more than 80%Not to exceed the original property by more than 80%

3

TearISO 34-1 : 2004≥400 N/cmNo requirement

4

Compression SetISO 815 : 2008

30 % (70±1 for 22 h)

or less

No requirement
 5Static Ozone Aging TestISO 1431-1 : 2004No crack after elongation by 20% and exposure to 50 pphm at 40 for 96hNo requirement

How to Choose Sutiable Floating Rubbe Fender for STS Operation?

The fender selection procedure for ship-to-ship operations is outlined below.

Two ship types, sizes and weather conditions such as Calm, Moderate and Rough are initially confirmed. 

The selections are designed based on Calm weather condition, therefore if the weather is confirmed as Calm, the fender system can be simply selected from the tables.

PETROLEUM, CHEMICALS and LIQUEFIED GASSES

Equivalent
Displacement
Coefficient (C)

Relative Velocity

Berthing Energy

Suggested Fenders

Tonnes

m / s

Tonnes.m

Diameter × Length (m)

Quanitity

1,000

0.3

2.4

1.0 × 2.0

3 or more

3,000

0.3

7

1.5 × 3.0

6,000

0.3

14

2.5 × 5.5

10,000

0.25

17

2.5 × 5.5

30,000

0.25

40

3.3 × 6.5

4 or more

50,000

0.2

48

3.3 × 6.5

100,000

0.15

54

3.3 × 6.5

150,000

0.15

71

3.3 × 6.5

5 or more

200,000

0.15

93

3.3 × 6.5

330,000

0.15

155

4.5 × 9.0

4 or more

500,000

0.15

231

4.5 × 9.0

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