Donut Fenders Supplier | Monopile Donut Fender Manufacturer

What Is Donut Fender?

A monopile donut fender has a monopile that can be embedded in the seabed or mounted on a quay wall. Instead, the donut fender is fixed to a steel monopile and protects the vessel by moving freely with the tide.

Donut fenders are similar in construction to foam filled fenders. They both have an outer shell made of polyurethane elastomer and nylon tire cord, and the inside is closed-cell foam. But donut fenders have a galvanized steel sleeve with a UHMW liner inside the sleeve. This allows the donut fender to slide along the monopile, thus protecting the vessel or guiding it through the channel.

Because of its free-moving nature, the donut fender is particularly suitable for use in areas with high tidal fluctuations. In addition, donut fenders are also ideal for use close to fairways, turns, and entrances.

Jerryborg Marine’s donut fenders are available in standard sizes and customized sizes for your needs. You can also install mooring points or auxiliary fenders on top of the donut fenders!

Get a Quote

Structure of Jerryborg Marine Donut Fenders

Steel core in the center: Our donut fenders have a steel center with a high compression capacity to hold the fender securely to the monopile. This design makes our donut fenders less prone to deformation on impact.
Polyethylene Pads: Our donut fenders are also lined with ultra-high molecular weight polyethylene (UHMW PE) inside the steel core. This reduces friction, reducing wear and tear on the steel core, resulting in less frequent maintenance.
100% Closed Cell Foam Core: Jerryborg Donut Fender’s foam core is made of cross-linked closed-cell polyethylene. This material’s high resilience and closed-cell molecular structure, which isolates gases, greatly enhance the Donut Fender’s performance.
Polyurethane Shell: The outer layer of our donut fenders is made of polyurethane. Polyurethane is resistant to acid, alkali, and salt and is also UV-protected. This shell allows the donut fender to cope with different weather conditions.
Nylon Reinforcement: The Jerryborg Donut Fender’s polyurethane skin is also embedded with nylon filaments. The nylon filament itself is very tough and thick. Adding nylon filaments to the shell gives our donut fenders a higher level of strength.

Get a Quote

Features of Jerryborg Marine Donut Fenders

Automatic Adjustment: Our monopile donut fender automatically moves up and down with the tide. This design allows the fender to stabilize and protect nearby boats.
Advanced Material Technology: The Jerryborg Donut Fender is made from a blend of natural and synthetic rubber. This blend provides better shock absorption and durability than a single material and greater resistance to UV and saltwater corrosion.
Uniform Impact Dispersion: our donut fenders uniformly disperse the impact of boat strikes. This design reduces stress and damage to the dock structure.
Low Maintenance: Besides evenly dispersing impact forces, Jerryborg Donut Fenders are resistant to common harsh water conditions such as mold, vine tigers, and salt corrosion. That’s why our donut fenders typically require no maintenance, saving money.
Easy to Integrate: Once installed on a monopile, our donut fenders don’t require major modifications. They support quick upgrades and replacements.

Get a Quote

Advantages of Jerryborg Marine Monopile Dount Fenders

Absorbs large impacts: Jerryborg Marine Donut Fender uses 100% closed-cell foam. This special design allows our donut fenders to absorb large impacts.
Low reaction force: Our donut fenders have a slower and smoother reaction force after a collision than ordinary rubber fenders.
Easy to install: Our donut fenders are easily installed by placing the fenders on pre-set steel monopiles. The monopile has integrated lifting eyes.
Adaptive: The Jerryborg Marine Donut Fender can change with the water level because of the internal low-friction guides.
Stable Buoyancy: Our Donut Fenders stay afloat even if the outer polyurethane shell is punctured by the foam core inside.
Easy maintenance: Our donut fenders are easy to install, have stable buoyancy, and have a long service life. Thus, there is no need for frequent maintenance, which reduces operating costs.

Get a Quote

Donut Fender Technical Performance

Get a Quote

Donut Fender Performance

DONUT DIAMETER	4.5 / 1.37		5.0 / 1.52		6.0 / 1.82		7.0 / 2.13		7.5 / 2.29		9.0 / 2.74
FEET / METERS	FEET / METERS		FEET / METERS		FEET / METERS		FEET / METERS		FEET / METERS		FEET / METERS
PILE DIAMETER	2.0 / 0.61		2.5 / 0.76		3.0 / 0.91		3.5 / 1.06		4.0 / 1.22		5.0 / 1.52
feet / meters	feet / meters		feet / meters		feet / meters		feet / meters		feet / meters		feet / meters
PERFORMANCE	ENERGY	REACTION	ENERGY	REACTION	ENERGY	REACTION	ENERGY	REACTION	ENERGY	REACTION	ENERGY	REACTION
PERFORMANCE	ABSORPTION	FORCE	ABSORPTION	FORCE	ABSORPTION	FORCE	ABSORPTION	FORCE	ABSORPTION	FORCE	ABSORPTION	FORCE
FLAT HEIGHT	ft*kip	kip	ft*kip	kip	ft*kip	kip	ft*kip	kip	ft*kip	kip	ft*kip	kip
feet / meters	(kN*m)	(kN)	(kN*m)	(kN)	(kN*m)	(kN)	(kN*m)	(kN)	(kN*m)	(kN)	(kN*m)	(kN)
2.0 / 0.61	4	18	5	20	7	24	–	–	–	–	–	–	STANDARD CAPACITY
2.0 / 0.61	-5	-80	-7	–89	-9	-107	–	–	–	–	–	–
3.0 / 0.91	6	27	7	29	11	35	15	41	17	44	24	53
3.0 / 0.91	-8	-120	-9	-129	-15	-156	-20	-182	-23	-196	-33	-236
4.0 / 1.22	8	35	10	39	14	47	19	55	22	59	32	71
4.0 / 1.22	-11	-156	-14	-173	-19	-209	26	245	30	262	43	316
5.0 / 1.52	10	44	12	49	18	59	24	69	28	74	40	88
5.0 / 1.52	-14	-196	-16	-218	-24	-262	-33	-307	-38	-329	-54	-391
6.0 / 1.82	12	53	15	59	21	71	29	83	33	88	48	106
6.0 / 1.82	-16	-236	-20	-262	-28	-316	39	369	45	391	65	471
7.0 / 2.13	14	63	17	69	25	83	34	96	39	103	56	124
7.0 / 2.13	-19	-280	-23	-307	-34	-369	-46	-427	-53	-458	-76	-552
8.0 / 2.44	16	72	20	79	29	94	39	110	45	118	64	141
8.0 / 2.44	-22	-320	-27	-351	-39	-418	53	489	61	525	87	627
2.0 / 0.61	7	29	8	34	12	39	–	–	–	–	–	–	EXTRA CAPACITY
2.0 / 0.61	-9	-129	-11	-151	-16	-179	–	–	–	–	–	–
3.0 / 0.91	10	43	11	51	17	58	24	65	27	72	39	87
3.0 / 0.91	-14	-191	-15	-227	-23	-258	33	289	37	320	53	387
4.0 / 1.22	13	58	15	68	23	77	33	87	36	96	52	116
4.0 / 1.22	-18	-258	-20	-302	-31	-342	-45	-387	-49	-427	-71	-516
5.0 / 1.52	16	72	19	84	29	96	41	109	45	121	65	145
5.0 / 1.52	-22	-320	-26	-374	-39	-427	56	485	61	538	88	645
6.0 / 1.82	20	87	23	101	35	116	49	130	54	145	78	174
6.0 / 1.82	-27	-387	-31	-449	-47	-516	-66	-585	-73	-655	-105	-786
7.0 / 2.13	23	101	27	118	41	136	57	153	63	170	92	204
7.0 / 2.13	-30	-449	-35	-525	-52	-607	-72	-682	-82	-729	-119	-876
8.0 / 2.44	26	113	31	132	47	153	65	174	72	191	106	229
8.0 / 2.44	-34	-498	-40	-582	-60	-673	-84	-764	-96	-818	-138	-984

Applications of Jerryborg Marine Donut Fenders

Port and Harbor Protection

Donut fenders provide vital protection. They absorb impact energy from docking ships. They work for both commercial shipping ports and private marinas. They keep vessels and infrastructure safe.

Bridge Pier Protection

These fenders safeguard bridge piers from collisions with vessels. Thus, they reduce the risk of structural damage. They are ideal for bridges located in navigable waterways, enhancing overall safety.

Corner and Jetty Protection

Donut fenders protect docks and jetties’ vulnerable corners and edges. They help prevent damage during vessel maneuvering in tight spaces. This ensures the longevity of dock structures.

Adjustable Tidal Areas

Donut fenders protect dock structures in areas with tidal variations. They do so by moving up and down (vertically) with the tide. This feature maintains optimal contact with vessels, offering continuous protection.

Docking and Berthing Operations

These fenders enhance safety during docking and berthing operations. Thus, they provide a reliable fendering system. They are suitable for smooth operations in both calm and rough water conditions.

Navigational Aid

They act as a visual guide for vessels approaching docking areas. Donut fenders ensure safe berthing and help position ships accurately alongside docks. This reduces the risk of accidents.

Versatile Installations

Donut fenders can be helpful for temporary and permanent installations. They offer flexibility in various maritime projects. They are easy to install and remove, catering to different operational requirements.

Locks and Canals

Donut fenders cushion vessels as they navigate locks and canals. They prevent damage to the vessel’s structure. These fenders are suitable for both big commercial locks and small recreational canals.

Multipurpose Berths

Donut fenders are ideal for multipurpose berths. They accommodate various vessel sizes and types of vessels. Donut fenders ensure consistent protection and reduce maintenance costs for berth infrastructure.

Get a Quote