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DONUT FENDERS

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LION DONUT FENDERS (LDT)

Features

  • High energy absorption
  • Low maintenance and installation cost
  • Freely float with water level
  • Low hull pressure

Applications

  • Corner protection
  • Bridge protection
  • Submarine Jetties
  • Monopile structures

Lion Donut Fender is a Foam core type of Foam Fender. It has rotating design and gives floatation in the fluctuating water levels. Lion Donut Fenders are available in different diameters and all special sizes are available on request.

donut fender cross-section
Type D P DEFLECTION % ENERGY ABSORPTION (KN-MTR) REACTION FORCE (KN)
LDT 1270 1270 610 60 7.2 116
LDT 1450 1450 710 60 9.2 131
LDT 1520 1520 762 60 10.5 140
LDT 1780 1780 914 60 14.1 162
LDT 1910 1910 995 60 16.4 175
LDT 2030 2030 1067 60 18.6 186
LDT 2210 2210 1185 60 22.3 204
LDT 2290 2290 1219 60 23.6 210
LDT 2490 2490 1345 60 28.0 229
LDT 2540 2540 1372 60 29.3 234
LDT 2790 2790 1524 60 35.3 256
LDT 2970 2970 1636 60 40.1 273
LDT 3050 3050 1676 60 42.1 280
LDT 3300 3300 1829 60 49.5 304
LDT 3450 3450 1933 60 54.6 319
LDT 3530 3530 1981 60 57.2 327
LDT 3810 3810 2134 60 65.9 350
LDT 3960 3960 2241 60 72.1 366
LDT 4060 4060 2286 60 75.1 374
LDT 4220 4220 2388 60 81.3 389
  • All above dimensions are in mm. Above data is for reference purpose only.
  • Any customized Project & Product requirements can be catered by Lion Rubber’s Design & Development Team.

Lion Donut Fenders (LDT): Floating Protection for Marine Structures

Lion Donut Fenders are floating fenders engineered to protect monopile structures, bridge piers, and other cylindrical marine installations. Their unique rotating design allows them to float freely and adjust automatically with changing water levels, giving full 360° protection.
With a durable foam core, these fenders absorb high impact energy while minimizing hull pressure, reducing stress on both vessels and structures. They are built to last in tough marine conditions, requiring minimal maintenance and offering low installation costs.
Available in standard diameters and custom sizes, Lion Donut Fenders are flexible for different project needs. From corner protection and submarine jetties to bridges, they ensure reliable, long-term performance while keeping structures safe and efficient.

What Are Donut Fenders?

Donut fenders are floating solutions designed to protect marine structures and vessels during berthing and mooring operations. Their signature hollow cylindrical shape fits around piles, piers, or monopile structures, providing a buffer that absorbs impact energy and reduces stress on both the structure and the vessel.
Inside the fender, a foam core or internal steel framework ensures durability and structural integrity, while a low-friction bearing system allows the fender to rotate smoothly around the pile. This rotation helps the fender adapt to changing angles of contact and distributes forces evenly, enhancing protection and performance.
By combining flotation, rotation, and energy absorption, Lion Donut Fenders minimize hull pressure and prevent damage to marine installations. They are particularly effective in areas with fluctuating water levels, strong currents, or frequent vessel traffic. Designed for long-term use, these fenders deliver reliable performance with low maintenance, making them an essential solution for bridges, monopile structures, jetties, and other cylindrical marine applications.

Types of Donut Fenders Offered by Lion Rubber

Lion Donut Fenders come in several variants designed to protect a wide range of marine structures and vessel sizes:

  • Size & Diameter Range

    Available in multiple diameters to fit small to large piles, ensuring optimal protection during berthing or mooring operations.

  • Core Material

    Foam-filled: Offers high energy absorption for maximum impact protection. Hollow: Lightweight option for weight-sensitive installations without compromising durability.

  • Surface Coating Options

    Abrasion-resistant polyurethane for enhanced wear resistance. Durable rubber skin to withstand UV exposure, saltwater, and harsh marine conditions.

  • Customizations

    Pile diameter, clearance, and energy absorption can be tailored to project-specific requirements.

  • Standards Compliance

    Manufactured according to international marine fender standards, ensuring reliability, safety, and consistent performance.

  • Both standard and custom donut fenders combine flexibility, durability, and high-impact protection, making them suitable for bridges, jetties, monopile structures, and other cylindrical marine installations.

Key Features of Lion Rubber Donut Fenders

Lion Donut Fenders are engineered to deliver reliable protection and long-term performance for marine structures. Their design ensures safety, efficiency, and durability in even the harshest conditions. Key features include:

  • 360° Protection

    The fender rotates around piles or cylindrical structures to align with vessel movement, providing uniform impact absorption and complete protection.

  • Self-Adjusting to Tide Levels

    Freely floats with changing water levels, maintaining consistent contact and safety during fluctuating tides.

  • High Energy Absorption & Low Hull Pressure

    Foam core design absorbs impact energy effectively while keeping hull pressure low, minimizing stress on both vessels and structures.

  • Low-Maintenance Design

    Durable outer skin and long-lasting internal bearings reduce maintenance needs and installation costs, ensuring reliable performance over time.

  • Custom Engineering

    Fenders can be tailored for pile diameter, clearance, and energy absorption requirements, meeting project-specific operational needs.

  • Durable Construction

    Built to withstand saltwater, UV exposure, and harsh marine environments, providing long-term reliability.

  • Easy Installation

    Lightweight options and adaptable sizes make installation straightforward without compromising structural safety.

  • These features make Lion Donut Fenders a trusted choice for protecting monopile structures, bridge piers, submarine jetties, and other cylindrical marine installations. Combining flotation, rotation, and energy absorption, they offer a complete package of performance, safety, and cost-effectiveness for diverse marine projects.

Applications of Donut Fenders

Lion Donut Fenders are versatile solutions designed to protect a wide range of marine structures and vessels. Their robust construction, rotation capability, and flotation make them ideal for challenging marine conditions. Key applications include:

  • Bridge Piers

    Safeguard bridge supports from damage caused by vessel collisions, reducing maintenance and repair costs.

  • Monopile Structures

    Provide reliable protection for ports, harbors, and offshore platforms, absorbing impact energy while minimizing stress on structures.

  • Corner Protection & Submarine Jetties

    Shield corners and underwater jetty sections from direct contact with vessels, ensuring structural safety and longevity.

  • Navigation Aids & Offshore Buoys

    Protect critical marine installations exposed to fluctuating water levels and frequent vessel interaction.

  • Ship-to-Structure Mooring

    Perfect for areas with tidal variations, allowing vessels to berth safely while maintaining constant contact with the fender.

  • By combining flotation, energy absorption, and 360° coverage, donut fenders from Lion Rubber provide dependable protection across multiple marine applications. Their adaptability and durability make them a preferred choice for engineers and project managers seeking efficient, low-maintenance solutions for both standard and custom installations.

Why Choose Lion Rubber for Donut Fender Solutions

Lion Rubber brings over 30 years of experience in designing and manufacturing marine fenders, making them a trusted provider of high-quality donut fenders worldwide. Key reasons to choose Lion Rubber include:

  • Marine Industry Expertise

    Decades of hands-on experience ensure fenders are engineered for durability, performance, and safety in challenging marine environments.

  • Custom-Built Solutions

    Fenders can be tailored for specific pier and pile dimensions, clearance requirements, and energy absorption needs, ensuring optimal performance for every project.

  • Proven Reliability

    Lion Rubber donut fenders have been successfully deployed in ports, bridge piers, submarine jetties, and offshore facilities, demonstrating long-term operational excellence.

  • International Standards Compliance

    All fenders are manufactured in line with global marine standards, guaranteeing consistent quality and safety.

  • Efficient Global Supply Chain

    Timely delivery and technical support make project planning seamless, reducing downtime and installation delays.

  • Technical Support & Guidance

    Lion Rubber works closely with engineers and procurement teams to provide expert advice for selecting the right fender solutions.

Choosing Lion Rubber ensures access to durable, high-performance donut fenders backed by decades of experience and a commitment to reliability, safety, and customer satisfaction.  

Order Custom Donut Fenders from Lion Rubber

Looking for reliable and long-lasting donut fenders for your marine projects? Lion Rubber specializes in high-performance fenders engineered to deliver maximum protection, durability, and efficiency. With over 30 years of expertise, we provide both standard and custom-built solutions to match unique pile dimensions, clearance needs, and energy absorption requirements. 

Backed by international quality standards and a strong global supply network, our fenders are trusted by ports, bridges, and offshore facilities worldwide. Get in touch today for a tailored donut fender solution and a competitive quote from Lion Rubber’s technical experts. 

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Frequently Asked Questions

The correct size depends on the pile or pier diameter, vessel type, and berthing energy. Choosing appropriately ensures optimal protection, reduces hull pressure, and extends both vessel and structure life. Lion Rubber provides guidance for selecting the most suitable donut fenders for your project.
Yes. Lion Rubber can design donut fenders to match specific pile diameters, clearance requirements, or energy absorption needs. This ensures seamless integration, even for unusual or complex structures.
Unlike fixed cylindrical fenders, donut fenders rotate around piles to align with vessel movement. This reduces localized stress, provides 360° protection, and adapts to tidal changes, offering superior safety and efficiency.
With their durable foam core and abrasion-resistant coating, donut fenders typically last over 10 years. Maintenance is minimal, requiring only periodic inspections for wear or damage.
Absolutely. Their floating and self-adjusting design allows them to maintain constant contact with vessels, ensuring consistent protection in tidal zones, offshore platforms, and harbor installations.

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