{"id":2259,"date":"2026-02-26T06:28:19","date_gmt":"2026-02-26T06:28:19","guid":{"rendered":"https:\/\/zhhmarinefender.com\/?p=2259"},"modified":"2026-02-26T06:28:32","modified_gmt":"2026-02-26T06:28:32","slug":"difference-between-donut-fenders-and-foam-fenders","status":"publish","type":"post","link":"https:\/\/zhhmarinefender.com\/fr\/difference-between-donut-fenders-and-foam-fenders\/","title":{"rendered":"Diff\u00e9rence entre les garde-boues annulaires et les garde-boues en mousse"},"content":{"rendered":"<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Donut fenders are a type of foam-filled fender that is made to float around a central pile. They rotate and move up and down with the tides, making them great for protecting corners and guiding ships through narrow passages. Both types of fenders have foam cores that absorb a lot of energy and don&#8217;t puncture easily. However, normal <strong><a href=\"https:\/\/zhhmarinefender.com\/foam-filled-fenders\/\" target=\"_blank\" rel=\"noopener\">foam fenders<\/a><\/strong> are usually attached to walls, whereas donut fenders are free-floating and made for anchoring and turning dolphins.<\/p>\n<h2 class=\"font-semibold pdf-heading-class-replace pb-xxs text-xl leading-[40px] [&amp;:not(:first-child)]:pt-[21px] [&amp;_.underline]:underline-offset-[6px] [&amp;_a]:underline-offset-[6px]\">Fender Definitions and Scope<\/h2>\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Defining donut and foam-filled fenders for working berths depends on how they are mounted and whether they need to rotate around a pile.<\/p>\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Foam-filled fenders are buoyant, energy-absorbing units with a closed-cell foam core and a protective skin. They are usually fixed to a quay, dolphin face, or structural frame. We define them as a type of construction that can come in many shapes and mounting styles.<\/p>\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Donut fenders are a specific type of foam-filled fender. They are designed as a ring that slides on a pile. The ring can rotate and move up and down with water level changes. This pile-mounted operation changes how they handle shear forces from vessel movement. The skin, reinforcement, and hardware vary by manufacturer, so you should check these details in the submittals.<\/p>\n<p><strong>Learn More<\/strong>: <a href=\"https:\/\/zhhmarinefender.com\/what-is-a-foam-fender\/\" target=\"_blank\" rel=\"noopener\">What is a Foam Fender?<\/a><\/p>\n<h2 class=\"font-semibold pdf-heading-class-replace pb-xxs text-xl leading-[40px] [&amp;:not(:first-child)]:pt-[21px] [&amp;_.underline]:underline-offset-[6px] [&amp;_a]:underline-offset-[6px]\">Common Fender Selection Misconceptions<\/h2>\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Wrongly choosing between donut and foam-filled fenders often happens when people treat product names like ratings instead of checking the pile fit, clearance, and contact direction. The idea that \u201cdonut is better\u201d ignores pile diameter compatibility and the shear forces created by the vessel&#8217;s approach angle. The idea that \u201cfoam-filled is fixed\u201d ignores that this type of construction can be used in various layouts that are not pile-mounted. We tie the selection to berth limits and the commissioning method to avoid these mistakes.<\/p>\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Another misconception is that following the tide is always a benefit. A donut fender moves with the water level because the ring travels on the pile. However, its suitability still depends on the pile length, travel limits, and where the contact band is relative to the vessel&#8217;s freeboard. We also want to correct the notion that closed-cell foam means zero maintenance. Access for inspection and skin repair depends on reach, abrasion, and the operator&#8217;s maintenance plan.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter wp-image-2189 size-full\" src=\"https:\/\/zhhmarinefender.com\/wp-content\/uploads\/2025\/12\/Donut-Fender-2.jpg\" alt=\"Common Fender Selection Misconceptions\" width=\"768\" height=\"576\" srcset=\"https:\/\/zhhmarinefender.com\/wp-content\/uploads\/2025\/12\/Donut-Fender-2.jpg 768w, https:\/\/zhhmarinefender.com\/wp-content\/uploads\/2025\/12\/Donut-Fender-2-300x225.jpg 300w, https:\/\/zhhmarinefender.com\/wp-content\/uploads\/2025\/12\/Donut-Fender-2-16x12.jpg 16w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/p>\n<h2 class=\"font-semibold pdf-heading-class-replace pb-xxs text-xl leading-[40px] [&amp;:not(:first-child)]:pt-[21px] [&amp;_.underline]:underline-offset-[6px] [&amp;_a]:underline-offset-[6px]\">Best Berthing Scenarios for Each Fender<\/h2>\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">The best fit for donut versus foam-filled fenders depends on whether a pile is present, clearance limits, and if rotational guidance is needed. Donut fenders are often chosen when a vertical pile is the main contact structure. Rotation can reduce shear as a vessel slides along the contact zone. Foam-filled fenders are often chosen for a fixed berth face where a mounted array can control the contact area.<\/p>\n<table class=\"w-max table-auto border border-neutral\">\n<colgroup>\n<col \/>\n<col \/>\n<col \/>\n<col \/><\/colgroup>\n<tbody>\n<tr>\n<th class=\"min-w-[48px] max-w-[400px] border border-neutral p-2 bg-neutral-100 text-left\">\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Scenario Decision Point<\/p>\n<\/th>\n<th class=\"min-w-[48px] max-w-[400px] border border-neutral p-2 bg-neutral-100 text-left\">\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">More Typical Fit<\/p>\n<\/th>\n<th class=\"min-w-[48px] max-w-[400px] border border-neutral p-2 bg-neutral-100 text-left\">\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Why the Fit Works<\/p>\n<\/th>\n<th class=\"min-w-[48px] max-w-[400px] border border-neutral p-2 bg-neutral-100 text-left\">\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">What Should Be Verified<\/p>\n<\/th>\n<\/tr>\n<tr>\n<td class=\"min-w-[48px] max-w-[400px] border border-neutral p-2\">\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Pile-based guidance and corner protection<\/p>\n<\/td>\n<td class=\"min-w-[48px] max-w-[400px] border border-neutral p-2\">\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Donut fender<\/p>\n<\/td>\n<td class=\"min-w-[48px] max-w-[400px] border border-neutral p-2\">\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Rotation and vertical travel can reduce shear while keeping contact around a pile.<\/p>\n<\/td>\n<td class=\"min-w-[48px] max-w-[400px] border border-neutral p-2\">\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Pile diameter compatibility, ring travel range, clearance to other structures.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"min-w-[48px] max-w-[400px] border border-neutral p-2\">\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Fixed quay wall berthing line<\/p>\n<\/td>\n<td class=\"min-w-[48px] max-w-[400px] border border-neutral p-2\">\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Foam-filled fender<\/p>\n<\/td>\n<td class=\"min-w-[48px] max-w-[400px] border border-neutral p-2\">\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Fixed mounting creates a predictable contact band and spacing along the berth.<\/p>\n<\/td>\n<td class=\"min-w-[48px] max-w-[400px] border border-neutral p-2\">\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Fender spacing plan, contact height range, attachment frame limits.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"min-w-[48px] max-w-[400px] border border-neutral p-2\">\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Lock entrances and dry dock corners<\/p>\n<\/td>\n<td class=\"min-w-[48px] max-w-[400px] border border-neutral p-2\">\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Depends on scenario<\/p>\n<\/td>\n<td class=\"min-w-[48px] max-w-[400px] border border-neutral p-2\">\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Guidance and abrasion risk vary with geometry and approach angles.<\/p>\n<\/td>\n<td class=\"min-w-[48px] max-w-[400px] border border-neutral p-2\">\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Approach direction, corner clearance, skin abrasion exposure.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"min-w-[48px] max-w-[400px] border border-neutral p-2\">\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Bridge pier and constrained channel protection<\/p>\n<\/td>\n<td class=\"min-w-[48px] max-w-[400px] border border-neutral p-2\">\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Often donut with pile-like geometry<\/p>\n<\/td>\n<td class=\"min-w-[48px] max-w-[400px] border border-neutral p-2\">\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Rotating contact can reduce friction and snagging around a cylindrical element.<\/p>\n<\/td>\n<td class=\"min-w-[48px] max-w-[400px] border border-neutral p-2\">\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Allowable outer diameter, navigation clearance, debris and abrasion.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Turning Dolphins and Monopile Guides<\/h3>\n<p>The use of donut fenders for turning dolphins and monopile guides depends on a vertical pile acting as the contact element. A donut fender can rotate around the pile, reducing shear when a vessel slides along it. Before recommending a pile-mounted ring, you should have pile drawings, navigation clearances, and expected contact directions. Large tidal ranges can make managing contact height with fixed fenders difficult. The ring&#8217;s travel and contact band still depend on the pile length, stop collars, and water levels, so you should verify these inputs during design review.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-2188 size-full\" src=\"https:\/\/zhhmarinefender.com\/wp-content\/uploads\/2025\/12\/Donut-Fender-1.jpg\" alt=\"Best Berthing Scenarios for Each Fender\" width=\"768\" height=\"576\" srcset=\"https:\/\/zhhmarinefender.com\/wp-content\/uploads\/2025\/12\/Donut-Fender-1.jpg 768w, https:\/\/zhhmarinefender.com\/wp-content\/uploads\/2025\/12\/Donut-Fender-1-300x225.jpg 300w, https:\/\/zhhmarinefender.com\/wp-content\/uploads\/2025\/12\/Donut-Fender-1-16x12.jpg 16w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/p>\n<h3>Quay Walls and Fixed Berths<\/h3>\n<p>Foam-filled fenders on quay walls rely on fixed placement and consistent spacing to control the contact band. A foam-filled fender mounted on a wall or frame can be arranged to match the berth line and expected vessel sizes. You compare the berth geometry and desired contact area because a fixed system can be tuned by its layout, not by pile rotation. A foam-filled system can be used near a pile without being a donut system. The key question is whether the berth needs a controlled face contact zone or a wrap-around pile interface.<\/p>\n<h3>Lock Entrances and Dry Dock Corners<\/h3>\n<p>Choosing between donut and foam-filled fenders for lock entrances and dry dock corners depends on the corner\u2019s geometry, approach angle, and abrasion risk. Corners often face mixed motions, including side slides and intermittent contact, which can increase skin wear. You verify the approach path and clearance to nearby structures to prevent a wrong selection. Some corners benefit from a rotating interface if a vertical element is the contact point. Others need a fixed buffer to control how the vessel lands. The right choice depends on mounting options and maintenance access.<\/p>\n<h3>Bridge Piers and Constrained Channels<\/h3>\n<p>Protection for bridge piers and channels depends on navigation clearance and whether the protected element acts like a pile. A donut fender is useful when the protection concept relies on a ring moving and rotating around a cylindrical element. You verify clearance to navigation lanes and debris conditions because these sites can increase abrasion and impact frequency. When the element is not a true pile, a foam-filled fender mounted on a frame can provide a more predictable protective zone. The deciding factors are geometry, allowable outer diameter, and inspection access.<\/p>\n<h2 class=\"font-semibold pdf-heading-class-replace pb-xxs text-xl leading-[40px] [&amp;:not(:first-child)]:pt-[21px] [&amp;_.underline]:underline-offset-[6px] [&amp;_a]:underline-offset-[6px]\">Conclusion<\/h2>\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Recommendations for donut versus foam-filled fenders depend on berth geometry, tidal motion, and the project&#8217;s acceptance method. Donut fenders usually fit best when a vertical pile is the contact structure, and rotation can reduce shear. Foam-filled fenders are a better fit when the berth face is fixe,d and the project requires a controlled contact band.<\/p>\n<p><img decoding=\"async\" class=\"size-full wp-image-1475 aligncenter\" src=\"https:\/\/zhhmarinefender.com\/wp-content\/uploads\/2025\/04\/Foam-Filled-Fenders-5.jpg\" alt=\"Foam-Filled-Fenders-5\" width=\"768\" height=\"576\" srcset=\"https:\/\/zhhmarinefender.com\/wp-content\/uploads\/2025\/04\/Foam-Filled-Fenders-5.jpg 768w, https:\/\/zhhmarinefender.com\/wp-content\/uploads\/2025\/04\/Foam-Filled-Fenders-5-300x225.jpg 300w, https:\/\/zhhmarinefender.com\/wp-content\/uploads\/2025\/04\/Foam-Filled-Fenders-5-16x12.jpg 16w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/p>\n<h2 class=\"font-semibold pdf-heading-class-replace pb-xxs text-xl leading-[40px] [&amp;:not(:first-child)]:pt-[21px] [&amp;_.underline]:underline-offset-[6px] [&amp;_a]:underline-offset-[6px]\">FAQ on Fenders<\/h2>\n<h3 class=\"font-semibold pdf-heading-class-replace pb-xxs text-lg leading-[30px] [&amp;:not(:first-child)]:pt-[15px] [&amp;_.underline]:underline-offset-[6px] [&amp;_a]:underline-offset-[6px]\">Are donut fenders the same as foam-filled fenders?<\/h3>\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Donut fenders are a special type of foam-filled fender designed for pile-mounted use. The difference is whether the fender must slide and rotate around a vertical pile. &#8220;Foam-filled&#8221; describes a construction family, while &#8220;donut&#8221; describes a ring shape plus a pile interface.<\/p>\n<h3 class=\"font-semibold pdf-heading-class-replace pb-xxs text-lg leading-[30px] [&amp;:not(:first-child)]:pt-[15px] [&amp;_.underline]:underline-offset-[6px] [&amp;_a]:underline-offset-[6px]\">When does a donut fender make more sense?<\/h3>\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">A donut fender is better for pile-based guidance, where rotation can reduce shear. This often applies to turning dolphins and guided monopiles. You should verify pile diameter compatibility and ring travel limits before you buy.<\/p>\n<h3 class=\"font-semibold pdf-heading-class-replace pb-xxs text-lg leading-[30px] [&amp;:not(:first-child)]:pt-[15px] [&amp;_.underline]:underline-offset-[6px] [&amp;_a]:underline-offset-[6px]\">What geometry details prevent installation mismatch?<\/h3>\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Mismatch risk depends on pile diameter compatibility, allowable outer diameter, clearance to other structures, and the required contact band height. Donut designs also need uninterrupted travel along the pile. You should verify drawings, site measurements, and installation access together.<\/p>\n<h3 class=\"font-semibold pdf-heading-class-replace pb-xxs text-lg leading-[30px] [&amp;:not(:first-child)]:pt-[15px] [&amp;_.underline]:underline-offset-[6px] [&amp;_a]:underline-offset-[6px]\">Can foam-filled fenders handle tidal variation?<\/h3>\n<p class=\"text-md font-regular leading-[24px] pb-xxs pt-[9px]\">Yes, foam-filled fenders can work with changing water levels. Effectiveness depends on the contact band design. A fixed array can be laid out to cover a range of contact heights, but you should verify this against low-water and high-water conditions.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Donut fenders are a type of foam-filled fender that is made to float around a central pile. They rotate and [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1473,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[27],"tags":[20],"class_list":["post-2259","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-foam-fenders-technology","tag-fender-systems"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - 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