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FAQs about Pneumatic Fenders
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What are Outer and inner rubber material requirements for Yokohama type floating fenders

Test itemTest methodRequired valueOuter rubberInner rubber1. Before aging–––1.1 Tensile strengthISO 37:201118 MPa or more10 MPa or more1.2 ElongationISO 37:2011400 % or more400 % or more1.3 HardnessISO 7619-1:201060 ± 10 (Durometer hardnessType A)50 ± 10 (Durometer Hardness Type A)2. After agingISO 188:2011Air oven aging, 70°C ± 1°C, 96 hAir oven aging, 70°C ± 1°C, 96 h2.1 Tensile strengthISO 37:2011Not less than 80 % of the originalpropertyNot less than 80 % of the origi-nal property2.2 ElongationISO 37:2011Not less than 80 % of the originalpropertyNot less than 80 % of the origi-nal property2.3 HardnessISO 7619-1:2010Not to exceed the original prop-erty by more than 8Not to exceed the original prop-erty by more than 83. TearISO 34-1:2010400 N/cm or moreNo requirement4. Compression setISO 815-1:200830 %(70 ± 1 °C, 22hours) or lessNo requirement5. Static ozone aging testISO 1431-1:2012No cracks after elongation by 20 % and exposure to 50 pphma at 40 °C for 96 hNo requirement

What is the advantage of pneumatic fenders compared to traditional fenders ?

What is the advantage of pneumatic fenders compared to traditional fenders 1. Safety and ReliabilityYokohama Type 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. large-size fenders are equipped with a safety valve to release the inside air in the event of accidental over-pressure. 2. No Deterioration or Variation in Performance Jerryborg Marine Pneumatic Rubber Fenders utilize the compressive elasticity of air, therefore performance deterioration due to fatigue is absent. our Pneumatic Rubber Fenders also fully comply with the durability test required by ISO17357-1: 2014. Any reduction of the guaranteed energy absorption (GEA) is not accepted. 3. Advantages at Inclined Berthing Yokohama Pneumatic Rubber Fenders, energy absorption does not decrease at inclined compression up to 15 degrees.                                                Reduction of Energy Absorption at Inclined Berthing for Pneumatic, Solid and Foam Fender Distribution of load is also comparatively even because of the molecular freedom of air and high flexibility of the multi-layered cord-reinforced rubber membrane.                                                           Load Distribution at Inclined Berthing for Pneumatic, Solid and Foam Fender  4. Most Cost Competitive SystemThe utilization of the compressive elasticity of air, unlike other fenders which need protector panels, provides completely uniform surface pressure on contact, making Pneumatic Rubber Fenders ideal. The surface pressure of the Yokohama Pneumatic Rubber Fenders is equal to the internal air pressure 5. Soft Reaction Force for Ship and Jetty StructureThe reaction force of Pneumatic Rubber Fenders does not increase sharply, even under excess load conditions. Therefore, the Pneumatic Rubber Fenders perform well in such cases, and protect ships and mooring facilities. In contrast, the reaction force of solid rubber fenders, including buckling-type fenders, increases sharply under excess load conditions.                                                                                     Soft Reaction Force for Ship and Jetty Structure it can be seen that the Pneumatic Rubber Fenders are ideal as fender system because of gentle treatment of ships in below table. Compression StageComparisonA, A' : Buckling point of solid fenderPneumatic fender has lower reaction force and exerts lower hull pressure compared to the solid rubber fender B, B' : Normal deflection pointPneumatic fender has lower reaction force and exerts lower hull pressure compared to the solid rubber fender C, C' : Designed rated energy pointPneumatic fender has slightly higher reaction force only at this point D, D' : Abnormal berthing pointPneumatic fender has lower reaction force and exerts lower hull pressure compared to the solid rubber fender 6. Lower Mooring Forces under Rough Weather Conditions the reaction force and deflection of Pneumatic Rubber Fenders do not easily reach the maximum because the reaction force increases slowly and allowable deflection is wide. Thus, the Pneumatic Rubber Fenders safely protect ships and mooring facilities even under rough weather conditions.The use of Pneumatic Rubber Fenders sometimes eliminates the necessity of constructing a breakwater in the harbor. There are many studies and reports relating tothe above subjects.                                       Model Studies on Ship's Movement with Yokohama Pneumatic Rubber Fender & with Buckling Fender                                                       Calculation Results of Harbor Oscillations for Ship Motions moored along Quay Walls 7. Stronger against Shearing Force Pneumatic Rubber Fenders are adequately reinforced using strong tire-cord to cope against such forces as well as internal pressure.                                                                                                         Stronger against Shearing Force 8. Adaptable to the Tide 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.                                                                                                Adaptable to Tide 9. Simple and Low Cost Installation The weight of Pneumatic Rubber Fenders is supported by the water on which it floats. Therefore, the fender can be moored simply by means of a guy rope or chain, requiring minimal extra cost. It can be removed easily to a suitable jetty or quay when not in use, or transferred to another mooring point whenever required.                                                     Φ1000×2000L-P50 Jerryborg Marine Pneumatic Rubber Fenders installed at a jetty 10. Low Maintenance Cost Maintenance cost of Jerryborg Marine Pneumatic Rubber Fenders is very low. Although the internal pressure will vary with seasonal changes, the air leakage is so minimal that it is sufficient to check the air pressure only once a year. The chain net needs to be replaced only once in 3 or 4 years, depending on ambient conditions. 11. Shipping Cost Minimization In order to minimize the shipping cost of Pneumatic Rubber Fenders, the fenders are usually packed and shipped in containers or on pallets in deflated and folded down state.                                                                            Vacuumed and Folded Down Condition for D4500×9000L-P80

What is standard sizes of pneumatic marine docking rubber fender ?

The Docking Pneumatic Rubber Fenders are available in the following sizes, which are generally expressed in terms of diameter by length.                                                                    Standard Sizes of Pneumatic Rubber Fender

Nine Main Types of Pneumatic Rubber Fender

How many types of floating pneumatic fenders are available ? Type I—Net-type Pneumatic FendersNet-type fenders (Type Ⅰ) are covered with a chain net, wire net or fiber net for small size fenders. Usually these nets have used-tires together with rubber sleeves for additional protection, except fiber net which has only rubber sleeves. Chain nets last longer against corrosion, while wire nets are light and more easily repaired. Type II—Sling Type Floating Rubber Fenders Sling-type fenders (TypeⅡ) Φ500×1000L - Φ4500×9000L have an attachment eye on each end for lifting and installation. Handling of sling type fenders is easy due to their lightweight. Type III—Ribbed Type Pneumatic FendersRibbed type fenders have rubber humps on fender body for better protection purpose. The cushioning effect is better than sling type.  Type IV—Rubber Mat & Rope Type Pneumatic FendersRubber Mat & Rope Type adopts rubber mat, ropes and rubber tube as net for protection and cushion. It is one kind of sling type pneumatic fenders.  Type V—Rubber Sleeve Net Type Pneumatic Fenders Rubber sleeve nets cover the chain net completely by strong rubber sleeves. The rubber sleeve is made of rubber reinforced with synthetic-tire-cord. The standard colors of the rubber sleeve are black and orange. Type VI—Fiber Rope Type Floating Fenders Fiber rope nets cover the fender body completely by strong marine ropes. The rope is made of reinforced fiber material. The colors of the fiber rope are various.  Type VII—Aircraft Tire Chain Net Aircraft tire chain nets use air craft tires, instead of automobile tires, to keep larger stand-off distance and enough protection for the fender body. Type VIII—Grey Rubber, White Rubber Floating Fenders Grey/White rubber is a specially formulated rubber with color compound added. Creamy white color can be requested instead of grey color as an alternative. Type IX Vertical Hydro-pneumatic Fender Vertical Hydro-pneumatic Pneumatic Rubber Fenders are specially designed pneumatic fenders that can be water-ballasted and installed vertically.They are popular with vessels whose berthing point is below the water line such as catamaran ships, semi-submersibles platforms or other submersibles.

What is the basic construction of pneumatic rubber fenders ?

What is the basic construction of pneumatic rubber fenders ? The Floating-type Yokohama Pneumatic Rubber Fenders are kind of a cylindrical air bag with hemisphericalheads at both ends. Basic body construction of this fender consists of an outer rubber layer, cord layers and an inner rubber layer. All of these are vulcanized together, and then proven by hydraulic pressure test. Outer RubberThe outer rubber layer protects the cord layers and inner rubber layer from abrasion and other external forces. This compound has sufficient tensile and tear strength to withstand any weather condition and hard usage. Standard color is black, but other colors such as grey and creamy white are available on request. Test ItemInspection MethodsOuter RubberInner RubberBefore AgingTensile strengthISO 37 : 201118 Mpa or more10 Mpa or moreElongationISO 37 : 2011400% or more.400% or more.HardnessISO 7619-1: 201060 ±10(Durometer hardness Type A)50 ±10(Durometer hardness Type A)After Aging Test method ISO188:199870±1C°× 96 hrsTensile strengthISO 37 : 2011Not less than 80% of the original propertyNot less than 80% of the original propertyElongationISO 37 : 2011Not less than 80% of the original propertyNot less than 80% of the original propertyHardnessISO 7619-1: 2010Not to exceed the original property by more than 8Not to exceed the original property by more than 8Tear resistanceISO 34-1 : 2010400 N/cm or moreNo requirementCompression testISO 815-1 : 200830% (70±1C°for 22 hrs) or lessNo requirementStatic ozone aging testISO 1431-1 : 2012No cracks after elongation by 20% and exposure to 50 pphm at 40C°for 96 hrs No requirement Synthetic-tire-cord LayerThe reinforcement cord layers, which are made of Synthetic-tire-cord, are arranged at ideal angles to hold the internal pressure and to distribute the stress evenly. As the main fibers of the synthetic-tire-cord are not braided like synthetic canvas fabric or synthetic belt fabric, there are advantages for its fatigue-resistance performance and pressure-holding performance. Inner RubberThe inner rubber layer seals the air inside, utilizing a compound equivalent to that of the liner or tube of an automobile tire. 

How to install Yokohama type pneumatic rubber fenders ?

Installation MethodsAt both ends of the fender, first shackles, then swivel joints, followed by a further shackle should be installed. A guy chain or guy rope is secured to the outer shackle. The swivel joint prevents twisting of the guy chain or wire.

What is the initial pressure rating of pneumatic fenders ?

What is the initial pressure rating of pneumatic fenders ?There are two initial pressure ratings for Yokohama Type Pneumatic Rubber Fenders :1) Pneumatic 50 (P50, Initial internal pressure 50KPa, 0.05Mpa)2) Pneumatic 80 (P80, Initial internal pressure 80KPa, 0.08Mpa)

What is ISO17357-1:2014 ?

What is ISO17357:1/2014 Certificate ISO 17357-1:2014 specifies the material, performance, and dimensions of high-pressure floating pneumatic rubber fenders, which are intended to be used for the berthing and mooring of a ship to another ship or berthing structure.Pneumatic fenders should be fully ISO17357-1:2014 compliant, and have supporting, authenticated certification to prove it.Please be kindly advised that ISO 9001/9002 is not an indicator of pneumatic fender performance.To know more technical requirements of ISO17357-1:2014, please contact us to get full technical instruction.

What is the structure of pneumatic fender ?

What is the structure of Yokohama type floating pneumatic rubber fender ?  3.1 outer rubberrubber layer that covers the outside of the fender to protect the cord layers and the inner liner rubber from abrasion and other external forces 3.2 inner rubberliner of a rubber membrane that seals the pressurized air inside the fender 3.3 synthetic-tyre-cord layer for reinforcementlayer made of synthetic-tyre-cord fabric, which maintains the internal air pressure of the fender. As the main fibres of the synthetic-tyre-cord fabric are not braided like synthetic canvas fabric or synthetic belt fabric, there are advantages for its fatigue-resistance performance and pressure-holding performance. 3.4 Air Valve and Safety ValveMedium and small sized Floating Yokohama Type Pneumatic Rubber Fenders are equipped with a small air valve, which is the same in size and construction as the air valve of an automobile tire. This valve serves as both air-check, air charge and release valve. On the large size fenders a big valve and a safety valve are equipped, the big valve serves for an air-charging and release, and the safety valve serves for releasing excess internal pressure when the fender is accidentally over compressed. 3.5 bead ringsteel ring which is placed at one end (or both ends) of the fender and holds the end of cord layers 3.6 flange openingsteel flange which is mounted on the fender, to which an air valve or safety valve can be adapted 3.7 fender cageFender cage covers the outer rubber layer to protect the whole fender body, the fender cage has various versions which also distinguish the fender type. 3.8 towing ringTowing ring is connected to opening flange and combine the fender cage for easy lifting and moving. It is often connected with additional end shackle and swivels. 

What is the advantage of marine airbag made by Jerryborg Marine ?

The Advantage of Marine Airbag Made By Jerryborg Marine 1. High Bearing CapacityInflatable marine rubber airbag’s main technical requirement is regulated in CB/T 3795--1996 published by China State Shipbuilding Corporation and  ISO14409:2011 ships and marine technology — Ship launching air bags .Jerryborg adopts new rubber formula and high-strength enhanced synthetic-tyre-cord layer, which improves the airbag’s bearing capacity two times more than ISO14409:2011 standard. Synthetic-tyre-cord layer The synthetic-tyre-cord layer of Jerryborg marine airbag adopts 1870dtex/2 (1870dtex/3 for option) chinlon tyre cord.  The strength & durability of airbag improves 40%, compared to polyester tire cord which is widely used by friendly competitors 2. High Kneading-resistance Capability When the airbag is rolling under the ship bottom, it will suffer a “kneading force” from ship bottom and ground because of not uniform rolling speed, which could case problems like delamination, layer buckling, etc. Jerryborg improved the manufacturing technique and raw material formula to strengthen kneading-resistance capability of the airbag and avoid worse accident. Marine Airbag Production Each layers of airbag are painting with specially formulated mucilage to dissolve dust & impurities.The specially formulated mucilagealso higher the adhesiveness among each layers to guarantee the air tightness. While most of friendly competitors cut this process in production to save manufacturing cost. 3. New Anti-explosion Design of End PartThe possibility of air leakage in the joint area of metal part and rubber part is also increasing as working pressure of airbag is added. After using for times under high working pressure, the airbag would burst and metal part would hurt workers. Jerryborg invented new anti-explosion design of the airbag end part, increasing the bonding strength and air tightness between rubber body part and end metal part. Jerryborg airbag is working very well under higher working pressure without potential safety hazard.  Marine Airbag Anti-explosion Head High strength galvanized anti-release structurecasting metal part with chemlok coating. chemlok coating strengthens the bonding between metal part and rubber body after vulcanization. anti-release structure of the metal part makes the connection more tight. 4. Optimizing Structure ConfigurationJerryborg built a strength and intensity model to test compression performance, stress intensity and direction. After testing for many times, we got the stress changeing regularity and optimized structure configuration design. The new optimized airbag successfully passed blasting experiment and achieved good performance in practical use.  Ship Launching Airbag Hydraulic Blasting Test Hydraulic Blasting Test is an all-around ultimate test for the performance, material, structure design, manufacturing technique of marine airbags. The testing result of Jerryborg Marine Airbag is beyond industrial standard Hydraulic blasting test for Jerryborg marine airbags Inspected by American customer and third-party detection institution 5. Good Abrasion-resistance Performance and High Ageing ResistanceThe airbag is working under bad and poor condition, suffering from long time sunlight exposure, seawater corrosion, impurities pollution, etc. The surface of airbag must be equipped with high capability of abrasion resistance, ageing resistance, corrosion resistance. Jerryborg airbag is made of natural rubber with special ingredients and unique manufacturing method. The finished airbag could working very well under above mentioned bad and poor working condition. 6. Higher Flexibility and Shock Absorption CapabilityJerryborg airbag is manufactured with unique integral twining technique. The airbag wall thickness is uniform with secondary seam in overlap joint. When rolling in slope and uneven ship path, the flexible airbag is helpful to reduce structure stress and ship launching risk. Rubber Airbag Distortion PhenomenonHeavy distortion phenomenon would cause delamination among airbag layers, then to cause more serious accidents. Such dangerous distortion phenomenon(like the photo) in ship launching process never happened to Jerryborg Marine Airbags

EVA/Polyurea Mooring Buoys VS Traditional Steel Mooring Buoys

Foam Mooring Buoys VS Traditional Steel Mooring Buoys Let’s ake a look at our info-graphic to find out why EVA foam is so fantastic and how changing to foam mooring buoys can save you time and money. Around the world, metal buoys are being replaced by cheaper and more durable plastic navigation buoys.  Steel buoys are very heavy and labour intensive and you need to bring them in every five years or so for repainting and refurbishing. Foam buoys can be cleaned and maintained at sea, and because they’re UV stable, they never need repainting.Foam buoys have many advantages over steel, they don’t rust, are easy to transport and last much longer than their steel counterparts. And because new foam technology is much lighter, you can use lighter, cheaper moorings and less chain wear.Not only that, but our foam buoys will remain afloat even when hit by a vessel because each buoy is filled with marine grade closed cell foam core.The benefits of foam buoys make them the obvious choice for the future. Foam buoy is really fantastic. ItemConsiderationsEVA / Polyurea Mooring BuoysTraditional Steel Mooring Buoys1Rusty and Worn OutEVA / Polyurea Mooring Buoy will never get rusty and worn out. The top and bottom Mooring Rings and its Middle Structure are all-in-ones made by stainless steel or HDG Q235 steel, no painting is required, the chance of getting rusty and worn out is much less than normal steel.A Steel Mooring Buoy and its top and bottom Mooring Rings that made in mild steel will require continuous maintenance including removal, repairing, anti-rust / anti-fouling painting and replacement almost every two years.2Pulling ForcesBearing of all pulling forces directly by the Middle Shaft. The Mooring Buoy itself only acts as a floatation unit to support the weight of the Mooring Chain and maintain 33 – 50 % stays afloat on the surface as required.Bearing of pulling forces among the cylindrical steel structure of the Mooring Buoy. In case of ageing or lack of maintenance, it may be creaked, holed, sunk or pulled apart during a heavy storm.3Anti CollisionThe cylindrical body of an EVA / Polyurea Mooring Buoy is soft, light-weight and high abrasive material, in case of collision, the impact forces will be much reduced and made no damage to the Boat.Damages to the Steel Mooring Buoy and the Boat even in a minor collision.4WeightAn EVA / Polyurea Mooring Buoy of 1.0 meter in Diameter only weighs about 120 Kg. The Mooring Buoy’s material is light-weight (buoyant), long-lasting and maintenance-free.A Steel Mooring Buoy of 1.0 meter in Diameter weights about 550 Kg. The Mooring Buoy’s material is heavy steel, in case of ageing/damages (cracked and holed) it will sink, unless it had been filled with Styrofoam inside, but it will require additional costs and procedures.5BuoyancyThe weight of a Mooring Chain 25 mm x 12 meters long is about 170 Kg (downward force). In order to maintain 33 – 50 % of the Mooring Buoy stays afloat on the surface as required, an EVA / Polyurea Mooring Buoy of 0.8 meter in Diameter only needs 0.8 meter in Height to offset the downward forces and maintain about 0.4 meter stays afloat on the surface.In order to maintain 33 – 50 % of the Mooring Buoy stays afloat on the surface as required, a Steel Mooring Buoy of 1.0 meter in Diameter needs about 1.2 meters in Height to offset the downward forces and maintain about 0.6 meter stays afloat on the surface.Higher the Mooring Buoy afloat on the surface, higher the chance of titling sideway that causes the growth of marine barnacles and worn out on the top half of the Mooring Buoy.6MaintenanceAn EVA / Polyurea Mooring Buoy will never get rusty, worn out and it is very light-weight, over a period of time, when marine barnacles found on the surface and underneath of the Mooring Buoy, it can be easily flipped over 90 degrees on the surface and cleaned in place Without removal and repainting. EVA / Polyurea Mooring Buoy is long-lasting and maintenance-free, it may last for 10 years or more under normal usage without extensive care.Over a period of time, when rusty and marine barnacles found on the surface and underneath of a Steel Mooring Buoy, additional costs will be required for removal, cleaning, repairing, repainting and replacement. Even under reasonable good maintenance, a Steel Mooring Buoy may only last for about 5 years. Call Jerryborg Marine on 0086-13881986406 to find out in more detail the advantages of changing to EVA foam buoys.

What is mooring buoy ?

The mooring buoy is designed in a manner that there is a heavier weight located right in the bottom of the sea. This weight is like an anchor holding the buoy afloat in the water. A mooring buoy has loops or chains attached to its top that floats on the water. These chains are provided so that ships or boats can be effectively moored to them.

What Is Closed Cell EVA Foam ?

Closed Cell Foam Closed cell is a type of foam in which the “cells” are enclosed and tightly pressed together, contrasting with the open, interconnected cells of the open-cell, or traditional polyurethane foam variation. This means that water rolls of the sides rather than passing through the foam. With higher density and greater pressure resistance, this malleable material comes in a variety of forms. From the rigid polyethylene (cross-poly) foam to the squishy feel of Flotex, closed-cell foam is a versatile material offerring a tight seal and enhanced stability. EVA Foam is a firm closed-cell foam with a softer, more rubbery feel than our polyethylene (cross-poly) offering. Its surface squishes down when you press your fingers into it, quickly bouncing right back into place. The firm structure and UV resistance of EVA foam makes it a great material for outdoor applications, and it is also popular for use as a Cosplay material. It weighs 2 lbs/ft³, and is commonly used for products like decking on boats, surfboards, knee pads, helmet padding, insulating hot tubs, shin guards and excercise mats. closed cell foam filled fender and mooring buoys of Jerryborg Marine are all made of high quality closed cell foam fender from 30kg/m³ to 120kg/³. 

What Is Polyurea Coating ?

What is Polyurea? Polyurea is a two-component high performance polymer coating. Polyurea is rapid curing from liquid to plastic coating that is flexible, waterproof and able to resist chemical submersion. When using a spray applied polyurea, sometimes the polyurea may be applied directly to the substrate and in other cases may require a primer. Top Coats may be required or optional after applying polyurea. Polyurea is usued largely in industrial applications and with its fast curing time the return to service time decreases. Polyurea is used as protection in chemical and abrasive environments, water and wastewater applications, flooring, roofing, decking, marine coatings, and transportation coatings. Polyurea can be applied to many different substrates at many different temperatures. Low pressure equipment or high pressure can be used in the spray application. Most applications are applied from a 1 to 1.5MM thickness.  Low pressure units are only for repair and maintenance projects. Polyurea is normally a hot spray applied coating at 70 degrees Celsius and is 100% UV and Color stable depending on the formulation type.  Basic Formulation types, referred to as slow aliphatic pure polyurea, do not require heat and can be applied by airless spray, brush or rollers. Basic formulations that are slow aliphatic, are often used as coatings for tanks, pools and roofs and have optional choices of high and low gloss finishes which may be used as a top coat to other polyurea applications. Fast Aromatic Pure Polyurea is a basic formulation that is chosen 70% of the time and is not 100 % color stable. It is used in industrial applications such as pip coating, chemical tanks, process areas, flooring, roofing, waterproofing, podium decks and used as a base coat for aliphatic polyurea top coats.   Polyurea is also available in a fast hybrid Polyurethane formulation that are used in lower abused areas such as waterproofing buried structures and podium decks.