Mono Pile Donut Fender Customized Standard Size For Bridge Protection

Mono Pile used Foam Filled Donut Type Foam Fender for Bridge Protection

Generally Foam Filled Donut fenders are designed with residual buoyancy to present the berthing face above the water line but some installations have utalised separate buoyancy chambers and submerged bodies for low impacts, all variations are possible with this versatile fender.

It is also possible to install any combination of mooring points or secondary fenders to the donut fender. These can be designed bespoke for your application.

Structure and Constrution of Foam Dunut Fenders



Applications of Donut Fenders

1. Breasting dolphins
2. Corner protection
3. Guiding structures
4. Locks and dry dock entrances, corner protection, turning dolphins, areas with large tidal variations or bridge protections
5. Other monopile structures
6. Submarine jetties

Characteristics and Advantages of Foam Donut Fenders

1. Proportional load deflection curve
2. Low shear forces
3. Self-adjusting to changing water levels
4. Low installation costs
5. Generally maintenance free
6. Individual drafts can be controlled by counterweights

Sizes and Performance of Foam Donut Fenders

The performance of the standard size Donut fenders given below represents a small selection of sizes selected to give an indication of the performance of a fender as a guide only.

Generally Donut fenders are designed on a project by project basis taking into consideration the required berthing energy requirement and the size of the pile the fender will be installed on. The installation pile can either be existing or if new then the final size of the fender can be determined taking into consideration movement and therefore energy absorption of the pile.

Pictures of our Foam Donut Fenders

How to install the donut fenders?

Installation of our Donut Fenders is very easy. The fenders will be delivered to site ready for installation on the fender piles. Once lifted over and lowered onto the fender pile the fender should be ready for use. Ballasting or trimming is not required as the fender will float at the designed level. Finally a capping feature can be placed over the top of the fender pile to finish the installation off. Maintenance of our donut fenders is very low as the internal bearings are designed to allow the fender to rotate and float up and down with the tide for a period of 25 years.

Any additional equipment installed with the donut fender such as secondary fenders or mooring points should be maintained separately.

How to Select and Order Suitable Foam Donut Fenders?

Generally Donut fenders are made to measure.
We have therefore given the dimensions, weight and performance (table on previous page) in groups of sizes designed to be an indication of performance only.
Precise design and finalised dimensions can be calculated with project specific pile dimensions and berthing energy/reactive load requirements.

Please just drop us a message here below or send us an email with your requirement for a detailed design to suit your requirements.

Guaranteed Quality of our Foam Donut Marine Fenders

Our goal is to meet the ever growing needs of our customers through the on time delivery of error free products, quality assurance is instrumental in the pursuit of our goal. Through document data and process control we can review and act, allowing to continually improve our products and processes. Internal audits of these control procedures helps to maintain a high standard of manufacturing.

The information obtained from the control procedures forms the basis of the Production Method Sheets (P.M.S.) systems helping us to train staff so specific manufacturing processes are adhered to and customer requirements are met.

Initially established as Qingdao Luhang Marine Airbag Factory in 1988 and changed to Qingdao Luhang Marine Airbags and Fenders Co.,Ltd in 2011, Qingdao Luhang had been devoted itself to developing and manufacturing marine airbags and marine fenders for more than 2 decades.

The factory area is 56,000m² with building area of  21,000m². The company has registered capital of USD 3 million and fixed asset of USD1.2 billion. We have a full line of production equipment: rubber mixing machine, rubber roller machine, the China biggest vulcanization tanks, the biggest Press Inspection Machine, EVA foam processing machine, Foam shaping machines and SPUA spraying machine.

Through these years' development, we have full range of marine airbags and marine fenders:

Ship Launching Airbags for ship launching and docking in shipyards

Marine Salvage Airbags for salvaging sinked vessels or refloating objects from under water

Other Airbags for special usage

Pneumatic Rubber Marine Fenders for ships and docks berthing

Foam Filled Marine Fenders for ship and docks berthing

Fixed Dock Rubber Fenders for docks and wharfs

Marine Buoys

From the begginning we have been focusing on technological innovation. With a team of experienced technicans and engineers, we have developed some high tech marine products and got some petents. We have been approved as a supplier of Navy products. 

Quality is our life line. We provide service of “three guarantees” (returning, repairing and replacing) on all our products in case of any defects due to the problems of material,manufacturing, performance under conditions of normal operation and maintenance.