{"id":5735,"date":"2025-11-27T16:52:36","date_gmt":"2025-11-27T08:52:36","guid":{"rendered":"https:\/\/www.airbag.cc\/?p=5735"},"modified":"2025-11-27T17:03:28","modified_gmt":"2025-11-27T09:03:28","slug":"what-do-donut-fenders-do","status":"publish","type":"post","link":"https:\/\/www.airbag.cc\/id\/what-do-donut-fenders-do\/","title":{"rendered":"Apa yang dilakukan fender donat?"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\" id=\"h-introduction\">Introduction<\/h2>\n\n\n\n<p>If you design or operate a port, you know that protecting your berths and vessels is crucial. <strong>Donut fenders<\/strong> play a key role in keeping ships safe while docking. They absorb energy, reduce stress on both vessels and piers, and adapt to tides and ship movements. In this article, we\u2019ll explore how donut fenders work, why they are useful, and how to choose the right ones for your port. We\u2019ll also highlight <strong>NANHAI<\/strong>\u2019s solutions for modern ports.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-are-donut-fenders\">What Are Donut Fenders?<\/h2>\n\n\n\n<p>Donut fenders are ring-shaped fenders that fit around a single pile or monopile. They are designed to rotate and float freely, which allows them to follow tide changes and align with moving ships. Typically, a donut fender has:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A foam core for energy absorption<\/li>\n\n\n\n<li>A durable outer layer, usually polyurethane or reinforced rubber<\/li>\n\n\n\n<li>A low-friction lining (like UHMW-PE) to allow smooth rotation around a pile<\/li>\n<\/ul>\n\n\n\n<p>These features let donut fenders absorb impact while reducing the force transferred to the pier or ship. Unlike traditional cylindrical or pile-wrap fenders, donut fenders can rotate, self-align, and maintain full contact with the vessel at different water levels.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/www.airbag.cc\/wp-content\/uploads\/2024\/06\/FLOATING-FENDERS-Donut-Fenders.jpg\" alt=\"donut fenders\" class=\"wp-image-2747\" srcset=\"https:\/\/www.airbag.cc\/wp-content\/uploads\/2024\/06\/FLOATING-FENDERS-Donut-Fenders.jpg 800w, https:\/\/www.airbag.cc\/wp-content\/uploads\/2024\/06\/FLOATING-FENDERS-Donut-Fenders-300x169.jpg 300w, https:\/\/www.airbag.cc\/wp-content\/uploads\/2024\/06\/FLOATING-FENDERS-Donut-Fenders-768x432.jpg 768w, https:\/\/www.airbag.cc\/wp-content\/uploads\/2024\/06\/FLOATING-FENDERS-Donut-Fenders-133x75.jpg 133w, https:\/\/www.airbag.cc\/wp-content\/uploads\/2024\/06\/FLOATING-FENDERS-Donut-Fenders-480x270.jpg 480w\" sizes=\"auto, (max-width:767px) 480px, (max-width:800px) 100vw, 800px\" \/><\/figure>\n<\/div>\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-typical-applications\">Typical Applications<\/h2>\n\n\n\n<p>Donut fenders are popular in modern port design, especially where precise ship guidance is required. Common applications include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Turning dolphins<\/strong> or <strong>lead-in piles<\/strong>, where ships need guidance into tight berths<\/li>\n\n\n\n<li><strong>High tidal areas<\/strong>, where the fender must follow the changing water level<\/li>\n\n\n\n<li><strong>Berths for sensitive vessels<\/strong>, like ferries, cruise ships, or LNG carriers, where low reaction forces are crucial<\/li>\n<\/ul>\n\n\n\n<p>Because they rotate and absorb energy effectively, donut fenders reduce the risk of damage to both ships and piers. They also help ports handle different ship sizes without needing frequent adjustments.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-design-and-selection-tips\">Design and Selection Tips<\/h2>\n\n\n\n<p>When choosing donut fenders, consider these factors:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Energy absorption<\/strong>: Make sure the fender can handle the kinetic energy of the vessel at berthing speed.<\/li>\n\n\n\n<li><strong>Maximum reaction force<\/strong>: The fender should not exceed the pier\u2019s or ship\u2019s structural limits.<\/li>\n\n\n\n<li><strong>Tide range<\/strong>: Select a fender that floats and rotates properly over the expected water level variations.<\/li>\n\n\n\n<li><strong>Ship type and size<\/strong>: Match the fender diameter and thickness to the largest ships you expect.<\/li>\n\n\n\n<li><strong>Materials<\/strong>: Use durable polyurethane or reinforced rubber with a low-friction inner lining for long service life.<\/li>\n<\/ol>\n\n\n\n<p><strong>Tip<\/strong>: Donut fenders often outperform cylindrical fenders or pile-wrap fenders in tidal areas or on turning dolphins, because they rotate and maintain full contact automatically.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/www.airbag.cc\/wp-content\/uploads\/2025\/04\/NANHAI-Donut-Fender-3.webp\" alt=\"working principle of donut fenders\" class=\"wp-image-3937\" srcset=\"https:\/\/www.airbag.cc\/wp-content\/uploads\/2025\/04\/NANHAI-Donut-Fender-3.webp 800w, https:\/\/www.airbag.cc\/wp-content\/uploads\/2025\/04\/NANHAI-Donut-Fender-3-300x225.webp 300w, https:\/\/www.airbag.cc\/wp-content\/uploads\/2025\/04\/NANHAI-Donut-Fender-3-768x576.webp 768w, https:\/\/www.airbag.cc\/wp-content\/uploads\/2025\/04\/NANHAI-Donut-Fender-3-100x75.webp 100w, https:\/\/www.airbag.cc\/wp-content\/uploads\/2025\/04\/NANHAI-Donut-Fender-3-480x360.webp 480w\" sizes=\"auto, (max-width:767px) 480px, (max-width:800px) 100vw, 800px\" \/><\/figure>\n<\/div>\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-structure-and-materials\">Structure and Materials<\/h2>\n\n\n\n<p>A typical donut fender consists of:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Closed-cell foam core<\/strong>: Light, buoyant, and highly energy-absorbing<\/li>\n\n\n\n<li><strong>Outer layer<\/strong>: Polyurethane or reinforced rubber, resistant to wear, UV, and saltwater<\/li>\n\n\n\n<li><strong>Inner lining<\/strong>: Low-friction material like UHMW-PE or nylon, allowing smooth rotation around the pile<\/li>\n\n\n\n<li><strong>Optional steel reinforcement<\/strong>: For very large berths, a steel insert can increase strength without compromising rotation<\/li>\n<\/ul>\n\n\n\n<p>This combination ensures that the fender can handle repeated impacts over years without significant deformation or damage.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-installation-and-maintenance\">Installation and Maintenance<\/h2>\n\n\n\n<p>Proper installation and regular maintenance are key to long-lasting performance:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Installation<\/strong>: Slide the donut fender onto a pre-installed pile. Ensure the low-friction lining is correctly seated to allow smooth rotation. No welding is required in most cases.<\/li>\n\n\n\n<li><strong>Inspection checklist<\/strong>:\n<ul class=\"wp-block-list\">\n<li>Check outer layer for wear, cracks, or cuts<\/li>\n\n\n\n<li>Ensure low-friction lining rotates freely<\/li>\n\n\n\n<li>Inspect foam core for compression or deformation<\/li>\n\n\n\n<li>Verify bolts or anchors are secure<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Maintenance tips<\/strong>:\n<ul class=\"wp-block-list\">\n<li>Avoid contact with sharp edges or ropes<\/li>\n\n\n\n<li>Replace worn linings promptly<\/li>\n\n\n\n<li>Rinse with fresh water to reduce salt and dirt buildup<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p>With proper care, donut fenders can last 10+ years, even in high-traffic ports.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-design-cases\">Design Cases<\/h2>\n\n\n\n<p>Here are two examples of donut fender applications:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Ferry Terminal in a Tidal Port<\/strong>: Donut fenders on turning dolphins allowed ferries to dock safely at any tide level. Energy absorption calculations ensured pier protection without overloading structures.<\/li>\n\n\n\n<li><strong>LNG Receiving Berth<\/strong>: Large donut fenders rotated freely on monopiles, guiding ships accurately while keeping reaction forces low. Polyurethane outer layers resisted wear from ice and ropes.<\/li>\n<\/ol>\n\n\n\n<p>In both cases, <strong>NANHAI<\/strong>\u2019s custom-designed donut fenders provided reliable performance with minimal maintenance.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-summary\">Summary<\/h2>\n\n\n\n<p>Donut fenders are essential for modern ports with variable tides and precise docking needs. They absorb energy, reduce stress, rotate around piles, and adapt to water level changes. For port designers and operators, donut fenders are a practical choice for turning dolphins, tidal berths, and sensitive vessel operations. With proper design and maintenance, <strong><a href=\"https:\/\/www.airbag.cc\/\">NANHAI<\/a><\/strong> donut fenders offer long-lasting, low-maintenance solutions for modern ports.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-vivid-red-background-color has-background wp-element-button\" href=\"https:\/\/www.airbag.cc\/contact-and-support\/\">free consultation<\/a><\/div>\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-faq\">FAQ<\/h2>\n\n\n\n<p><strong>Q1: Can donut fenders be used in all tidal conditions?<\/strong><br>A1: Yes, they are especially effective in areas with large tide variations because they float and rotate with the water level.<\/p>\n\n\n\n<p><strong>Q2: How do donut fenders reduce reaction forces on piers?<\/strong><br>A2: Their foam core absorbs energy while their rotation allows the ship to slide slightly, reducing peak forces on the pier.<\/p>\n\n\n\n<p><strong>Q3: What maintenance is required for donut fenders?<\/strong><br>A3: Inspect the outer layer for wear, ensure the inner lining rotates freely, check the foam core for deformation, and rinse regularly with fresh water.<\/p>\n\n\n\n<p><strong>Q4: How long do donut fenders last?<\/strong><br>A4: With proper installation and maintenance, they can last 10+ years in most ports.<\/p>\n\n\n\n<p><strong>Q5: Can they handle large vessels like LNG carriers?<\/strong><br>A5: Yes, properly sized donut fenders with durable materials and optional steel reinforcement can handle very large ships safely.<\/p>\n\n\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can donut fenders be used in all tidal conditions?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, they are especially effective in areas with large tide variations because they float and rotate with the water level.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do donut fenders reduce reaction forces on piers?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Their foam core absorbs energy while their rotation allows the ship to slide slightly, reducing peak forces on the pier.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What maintenance is required for donut fenders?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Inspect the outer layer for wear, ensure the inner lining rotates freely, check the foam core for deformation, and rinse regularly with fresh water.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How long do donut fenders last?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"With proper installation and maintenance, they can last 10+ years in most ports.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can donut fenders handle large vessels like LNG carriers?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, properly sized donut fenders with durable materials and optional steel reinforcement can handle very large ships safely.\"\n      }\n    }\n  ]\n}\n<\/script>\n\n","protected":false},"excerpt":{"rendered":"<p>Introduction If you design or operate a port, you know that protecting your berths and vessels is crucial. Donut fenders play a key role in keeping<span class=\"excerpt-hellip\"> [\u2026]<\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-5735","post","type-post","status-publish","format-standard","hentry","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.7.1 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>What do donut fenders do? - pneumatic fenders_yokohama fender_vessel fender-NanHai Groups Marine<\/title>\n<meta name=\"description\" content=\"Learn how NANHAI donut fenders protect ships and piers, absorb impact, and adapt to tides for modern port operations.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.airbag.cc\/id\/what-do-donut-fenders-do\/\" \/>\n<meta property=\"og:locale\" content=\"id_ID\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What do donut fenders do?\" \/>\n<meta property=\"og:description\" content=\"Learn how NANHAI donut fenders protect ships and piers, absorb impact, and adapt to tides for modern port operations.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.airbag.cc\/id\/what-do-donut-fenders-do\/\" \/>\n<meta property=\"og:site_name\" content=\"pneumatic fenders_yokohama fender_vessel fender-NanHai Groups Marine\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/nanhaimarine\/\" \/>\n<meta property=\"article:published_time\" content=\"2025-11-27T08:52:36+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-11-27T09:03:28+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.airbag.cc\/wp-content\/uploads\/2024\/06\/FLOATING-FENDERS-Donut-Fenders.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"450\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"a2\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Ditulis oleh\" \/>\n\t<meta name=\"twitter:data1\" content=\"a2\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimasi waktu membaca\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 menit\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.airbag.cc\\\/what-do-donut-fenders-do\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.airbag.cc\\\/what-do-donut-fenders-do\\\/\"},\"author\":{\"name\":\"a2\",\"@id\":\"https:\\\/\\\/www.airbag.cc\\\/#\\\/schema\\\/person\\\/e807cba4e19b01b05fe0ace0a5ee9219\"},\"headline\":\"What do donut fenders do?\",\"datePublished\":\"2025-11-27T08:52:36+00:00\",\"dateModified\":\"2025-11-27T09:03:28+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.airbag.cc\\\/what-do-donut-fenders-do\\\/\"},\"wordCount\":872,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.airbag.cc\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.airbag.cc\\\/what-do-donut-fenders-do\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.airbag.cc\\\/wp-content\\\/uploads\\\/2024\\\/06\\\/FLOATING-FENDERS-Donut-Fenders.jpg\",\"articleSection\":[\"News\"],\"inLanguage\":\"id\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.airbag.cc\\\/what-do-donut-fenders-do\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.airbag.cc\\\/what-do-donut-fenders-do\\\/\",\"url\":\"https:\\\/\\\/www.airbag.cc\\\/what-do-donut-fenders-do\\\/\",\"name\":\"What do donut fenders do? 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