{"id":5940,"date":"2026-02-28T16:15:29","date_gmt":"2026-02-28T08:15:29","guid":{"rendered":"https:\/\/www.airbag.cc\/"},"modified":"2026-03-02T16:37:52","modified_gmt":"2026-03-02T08:37:52","slug":"when-do-you-need-double-row-marine-airbags-for-ship-launching","status":"publish","type":"post","link":"https:\/\/www.airbag.cc\/id\/when-do-you-need-double-row-marine-airbags-for-ship-launching\/","title":{"rendered":"Kapan Anda Membutuhkan Kantung Udara Laut Baris Ganda untuk Peluncuran Kapal?"},"content":{"rendered":"\n<p>Airbag launching is a common way to move a ship from land into the water. It is widely used because it is flexible, cost-effective, and does not need a large slipway.<\/p>\n\n\n\n<p>But one important question often comes up:<\/p>\n\n\n\n<p><strong>Should we use a single row of airbags or double rows?<\/strong><\/p>\n\n\n\n<p>Some people think large ships must use double rows. Others try to save money and use only one row. In reality, there is no simple rule. The right choice depends on the ship\u2019s size, structure, weight, and the condition of the ground.<\/p>\n\n\n\n<p>In this article, we explain in simple terms when double-row airbags are a better choice.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"533\" src=\"https:\/\/www.airbag.cc\/wp-content\/uploads\/2024\/02\/NANHAI-Ship-Launching-Airbag-27-1024x533.jpg\" alt=\"ship launching airbags\" class=\"wp-image-2400\" srcset=\"https:\/\/www.airbag.cc\/wp-content\/uploads\/2024\/02\/NANHAI-Ship-Launching-Airbag-27-1024x533.jpg 1024w, https:\/\/www.airbag.cc\/wp-content\/uploads\/2024\/02\/NANHAI-Ship-Launching-Airbag-27-300x156.jpg 300w, https:\/\/www.airbag.cc\/wp-content\/uploads\/2024\/02\/NANHAI-Ship-Launching-Airbag-27-768x400.jpg 768w, https:\/\/www.airbag.cc\/wp-content\/uploads\/2024\/02\/NANHAI-Ship-Launching-Airbag-27-1536x800.jpg 1536w, https:\/\/www.airbag.cc\/wp-content\/uploads\/2024\/02\/NANHAI-Ship-Launching-Airbag-27-18x9.jpg 18w, https:\/\/www.airbag.cc\/wp-content\/uploads\/2024\/02\/NANHAI-Ship-Launching-Airbag-27-144x75.jpg 144w, https:\/\/www.airbag.cc\/wp-content\/uploads\/2024\/02\/NANHAI-Ship-Launching-Airbag-27-480x250.jpg 480w, https:\/\/www.airbag.cc\/wp-content\/uploads\/2024\/02\/NANHAI-Ship-Launching-Airbag-27.jpg 1920w\" sizes=\"auto, (max-width:767px) 480px, (max-width:1024px) 100vw, 1024px\" \/><\/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-1-what-is-the-difference-between-single-and-double-rows\">1. What Is the Difference Between Single and Double Rows?<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-single-row-arrangement\">Single-Row Arrangement<\/h3>\n\n\n\n<p>In a single-row setup, the airbags are placed along the center line of the ship.<\/p>\n\n\n\n<p>Features:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Simple layout<\/li>\n\n\n\n<li>Lower cost<\/li>\n\n\n\n<li>Weight is supported mainly in the middle<\/li>\n\n\n\n<li>Less sideways stability<\/li>\n<\/ul>\n\n\n\n<p>This works well for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Small ships<\/li>\n\n\n\n<li>Narrow hulls<\/li>\n\n\n\n<li>Ships with strong keels (V-shaped bottoms)<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-double-row-arrangement\">Double-Row Arrangement<\/h3>\n\n\n\n<p>In a double-row setup, airbags are placed on both sides of the ship bottom.<\/p>\n\n\n\n<p>Features:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Weight is spread out<\/li>\n\n\n\n<li>Better sideways stability<\/li>\n\n\n\n<li>Lower pressure on each airbag<\/li>\n\n\n\n<li>Higher safety margin<\/li>\n<\/ul>\n\n\n\n<p>This is often better for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Heavy ships<\/li>\n\n\n\n<li>Wide ships<\/li>\n\n\n\n<li>Flat-bottom ships<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-2-when-should-you-use-double-rows\">2. When Should You Use Double Rows?<\/h2>\n\n\n\n<p>There is no single rule. You should look at several factors.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-1-the-ship-is-heavy\">1) The Ship Is Heavy<\/h3>\n\n\n\n<p>As ship weight increases, each airbag must carry more load.<\/p>\n\n\n\n<p>If you notice:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Airbags are close to their load limit<\/li>\n\n\n\n<li>Too many airbags are needed in one line<\/li>\n\n\n\n<li>Airbags deform too much<\/li>\n<\/ul>\n\n\n\n<p>Then double rows may be safer.<\/p>\n\n\n\n<p>General industry experience:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Below 500 tons: usually single row<\/li>\n\n\n\n<li>Around 1,000 tons: depends on ship width<\/li>\n\n\n\n<li>Above 1,500 tons: double rows are common<\/li>\n<\/ul>\n\n\n\n<p>Heavier ships usually need more safety margin.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-the-ship-is-wide-or-flat-bottomed\">2) The Ship Is Wide or Flat-Bottomed<\/h3>\n\n\n\n<p>Ship width is very important.<\/p>\n\n\n\n<p>If the ship is wide and airbags are only in the center:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The sides hang too far out<\/li>\n\n\n\n<li>The bottom plate may bend<\/li>\n\n\n\n<li>Stress becomes concentrated in the middle<\/li>\n<\/ul>\n\n\n\n<p>Flat-bottom barges are especially sensitive to this problem.<\/p>\n\n\n\n<p>If ship width is over 10\u201312 meters, double rows are often a better choice.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-3-the-ship-has-a-high-center-of-gravity\">3) The Ship Has a High Center of Gravity<\/h3>\n\n\n\n<p>Some ships have heavy structures on top, such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Passenger ships<\/li>\n\n\n\n<li>Workboats with upper decks<\/li>\n\n\n\n<li>Ships with tall equipment<\/li>\n<\/ul>\n\n\n\n<p>These ships are less stable sideways.<\/p>\n\n\n\n<p>With only one row of airbags:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The ship may sway more<\/li>\n\n\n\n<li>Tilting risk increases<\/li>\n\n\n\n<li>Airbags may not share weight evenly<\/li>\n<\/ul>\n\n\n\n<p>Double rows increase the support width and improve stability during rolling.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-4-the-ship-bottom-is-not-very-strong\">4) The Ship Bottom Is Not Very Strong<\/h3>\n\n\n\n<p>Some ships have thinner bottom plates or lighter structures.<\/p>\n\n\n\n<p>If weight is supported only in the center:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Local dents may appear<\/li>\n\n\n\n<li>Long-term structural damage may happen<\/li>\n<\/ul>\n\n\n\n<p>Double rows spread the load and reduce pressure on any single area.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-5-ground-conditions-are-not-ideal\">5) Ground Conditions Are Not Ideal<\/h3>\n\n\n\n<p>If the launch area has:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Soft soil<\/li>\n\n\n\n<li>Uneven ground<\/li>\n\n\n\n<li>Limited load-bearing capacity<\/li>\n<\/ul>\n\n\n\n<p>A single row puts pressure in one narrow line.<\/p>\n\n\n\n<p>Double rows spread the pressure over a wider area, reducing the risk of sinking or uneven movement.<\/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-3-a-simple-way-to-decide\">3. A Simple Way to Decide <\/h2>\n\n\n\n<p>In real projects, not every team does complicated math. Many decisions are based on practical checks.<\/p>\n\n\n\n<p>Ask these questions:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-1-are-the-airbags-close-to-their-load-limit\">1. Are the airbags close to their load limit?<\/h3>\n\n\n\n<p>If yes, double rows are safer.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-is-the-ship-bottom-wide-and-flat\">2. Is the ship bottom wide and flat?<\/h3>\n\n\n\n<p>If yes, spreading the support makes sense.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-3-does-the-ship-look-unstable-during-testing\">3. Does the ship look unstable during testing?<\/h3>\n\n\n\n<p>If the ship sways or tilts easily, double rows help improve balance.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-4-are-you-saving-much-money-by-using-one-row\">4. Are you saving much money by using one row?<\/h3>\n\n\n\n<p>Often, the cost difference is only a few more airbags.<\/p>\n\n\n\n<p>Compared to the risk of structural damage, using extra airbags is usually a smart investment.<\/p>\n\n\n\n<p>Engineers often say:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>It is better to use two extra airbags than to risk one serious accident.<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-4-real-project-examples\">4. Real Project Examples<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-case-1-800-ton-flat-barge\">Case 1: 800-Ton Flat Barge<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Width: 9 meters<\/li>\n\n\n\n<li>Strong structure<\/li>\n\n\n\n<li>Low center of gravity<\/li>\n<\/ul>\n\n\n\n<p>Single row was used successfully. No structural problems.<\/p>\n\n\n\n<p>Conclusion: Medium-small ships with strong bottoms can use single rows safely.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-case-2-1-800-ton-cargo-ship\">Case 2: 1,800-Ton Cargo Ship<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Width: 14 meters<\/li>\n\n\n\n<li>Flat bottom<\/li>\n\n\n\n<li>Heavy upper structure<\/li>\n<\/ul>\n\n\n\n<p>Originally planned for single row, but changed to double rows after evaluation.<\/p>\n\n\n\n<p>Result:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Smooth rolling<\/li>\n\n\n\n<li>Even load distribution<\/li>\n\n\n\n<li>No deformation<\/li>\n<\/ul>\n\n\n\n<p>Conclusion: Large and wide ships are safer with double rows.<\/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-5-important-tips-for-double-row-setup\">5. Important Tips for Double-Row Setup<\/h2>\n\n\n\n<p>If you decide to use double rows:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Keep both sides symmetrical<\/li>\n\n\n\n<li>Use equal numbers of airbags on each side<\/li>\n\n\n\n<li>Maintain equal air pressure<\/li>\n\n\n\n<li>Keep spacing consistent<\/li>\n\n\n\n<li>Monitor sideways movement during launching<\/li>\n<\/ol>\n\n\n\n<p>Even with double rows, poor setup can cause uneven loading.<\/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-6-cost-vs-safety-short-discussion\">6. Cost vs. Safety (Short Discussion)<\/h2>\n\n\n\n<p>Yes, double rows cost more.<\/p>\n\n\n\n<p>But the extra cost usually means:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A few more airbags<\/li>\n\n\n\n<li>Slightly longer setup time<\/li>\n<\/ul>\n\n\n\n<p>Compared to repair costs or accident risks, this is usually a small price for better safety.<\/p>\n\n\n\n<p>In launching operations, safety margin is more important than saving a few airbags.<\/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-7-final-thoughts\">7. Final Thoughts<\/h2>\n\n\n\n<p>Using double-row airbags is not only about ship weight.<\/p>\n\n\n\n<p>You should consider:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ship weight<\/li>\n\n\n\n<li>Ship width<\/li>\n\n\n\n<li>Bottom structure<\/li>\n\n\n\n<li>Center of gravity<\/li>\n\n\n\n<li>Ground conditions<\/li>\n\n\n\n<li>Safety margin<\/li>\n<\/ul>\n\n\n\n<p>Double rows are strongly recommended when:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The ship is wide<\/li>\n\n\n\n<li>The ship is flat-bottomed<\/li>\n\n\n\n<li>The ship is over 1,000\u20131,500 tons<\/li>\n\n\n\n<li>Airbags are near load limits<\/li>\n\n\n\n<li>Stability is a concern<\/li>\n<\/ul>\n\n\n\n<p>In ship launching, proper arrangement is more important than minimizing cost.<\/p>\n\n\n\n<p>Safety should always come first.<\/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-faq\">FAQ<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-1-do-all-ships-need-double-row-airbags\">1. Do all ships need double-row airbags?<\/h3>\n\n\n\n<p>No. Small and narrow ships with strong bottoms can safely use a single row.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-at-what-weight-should-double-rows-be-used\">2. At what weight should double rows be used?<\/h3>\n\n\n\n<p>There is no strict rule. Around 1,000 tons, you should check ship width and structure. Above 1,500 tons, double rows are common.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-3-what-is-the-main-advantage-of-double-rows\">3. What is the main advantage of double rows?<\/h3>\n\n\n\n<p>Better load distribution and better sideways stability.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-4-is-double-row-launching-much-more-expensive\">4. Is double-row launching much more expensive?<\/h3>\n\n\n\n<p>Not usually. It mainly adds a few more airbags, which is often worth the extra safety.<\/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\": \"Do all ships need double-row airbags for launching?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. Small and narrow ships with strong bottom structures can safely use a single row of airbags. Double rows are usually needed for heavier, wider, or flat-bottom ships.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"At what ship weight should double-row airbags be used?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"There is no strict rule. Around 1,000 tons, ship width and bottom structure should be carefully evaluated. For ships over 1,500 tons, double-row arrangements are commonly used to improve safety.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What are the advantages of double-row airbag launching?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Double-row airbag arrangements spread the ship\u2019s weight more evenly, reduce pressure on the hull bottom, improve sideways stability, and increase overall safety during launching.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What risks can occur when using a single row of airbags?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For heavy or wide ships, a single row may cause airbags to approach their load limit, increase local stress on the hull bottom, and reduce sideways stability during rolling.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is double-row airbag launching much more expensive?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Not significantly. Double rows mainly require additional airbags and slightly more setup time. Compared to the potential cost of structural damage or accidents, the extra investment is usually worthwhile.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are double rows recommended for flat-bottom ships?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Flat-bottom ships benefit from double-row arrangements because the load is distributed across a wider area, reducing stress concentration along the centerline.\"\n      }\n    }\n  ]\n}\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Airbag launching is a common way to move a ship from land into the water. It is widely used because it is flexible, cost-effective, and does<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-5940","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 v27.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>When Do You Need Double-Row Marine Airbags for Ship Launching? - pneumatic fenders_yokohama fender_vessel fender-NanHai Groups Marine<\/title>\n<meta name=\"description\" content=\"When should double-row airbags be used for ship launching? 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