{"id":8626,"date":"2026-04-17T12:40:51","date_gmt":"2026-04-17T12:40:51","guid":{"rendered":"https:\/\/ultrasuonindt.it\/wind-turbine-bolt-tension-the-ultrasonic-method-with-the-dakota-bt\/"},"modified":"2026-10-02T10:14:52","modified_gmt":"2026-10-02T10:14:52","slug":"wind-turbine-bolt-tension-the-ultrasonic-method-with-the-dakota-bt","status":"publish","type":"post","link":"https:\/\/ultrasuonindt.it\/en\/wind-turbine-bolt-tension-the-ultrasonic-method-with-the-dakota-bt\/","title":{"rendered":"Wind turbine bolt tension: the ultrasonic method with the Dakota BT"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Modern wind turbines reach heights of more than 150 metres, with blades of 70-90 metres and outputs of up to 15 MW in the latest offshore versions. Structural integrity depends critically on the <strong>correct tension of the foundation, tower joint and blade root bolts<\/strong>. Ultrasonic measurement with the Dakota <strong>BT1-DL and BT2-DL<\/strong> is the reference method for the controlled tightening and periodic monitoring of these critical structural connections.  <\/p>\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"387\" height=\"252\" src=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_dakota-bt-Bolt-Tension-Monitor_immagine_hero_per_rappresentazione_famiglia.jpg?resize=387%2C252&#038;ssl=1\" alt=\"Dakota BT1-DL MiniMax bolt tension monitor for wind power\" class=\"wp-image-188\" style=\"width:600px\" srcset=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_dakota-bt-Bolt-Tension-Monitor_immagine_hero_per_rappresentazione_famiglia.jpg?w=387&amp;ssl=1 387w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_dakota-bt-Bolt-Tension-Monitor_immagine_hero_per_rappresentazione_famiglia.jpg?resize=300%2C195&amp;ssl=1 300w\" sizes=\"auto, (max-width: 387px) 100vw, 387px\" \/><\/figure>\n\n<h2 class=\"wp-block-heading\">The critical bolted connections of a wind turbine<\/h2>\n\n<p class=\"wp-block-paragraph\">On a modern wind turbine the main bolted connections carrying high structural responsibility are:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Foundation bolts (anchor bolts)<\/strong>: anchorages to the reinforced concrete base or, offshore, to the monopile or jacket. Typically M48-M72 in high-strength steel, from 1.5 to 3 metres long <\/li>\n<li><strong>Tower section joints<\/strong>: modern towers are assembled from several sections (typically 3-5), each connected to the next by a bolted flange with typically 100-140 M36-M48 bolts<\/li>\n<li><strong>Nacelle connection<\/strong> at the top of the tower (yaw bearing bolts)<\/li>\n<li><strong>Rotor (hub) connection<\/strong> to the main shaft<\/li>\n<li><strong>Blade connection<\/strong> to the hub (blade root bolts): dozens of bolts per blade, under cyclic fatigue loading<\/li>\n<li><strong>Gearbox and generator flanges<\/strong><\/li>\n<\/ul>\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<div class=\"wp-block-cover is-light popmake-4066 popmake-739\" style=\"border-width:1px;min-height:250px;aspect-ratio:unset;\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"250\" class=\"wp-block-cover__image-background wp-image-727 size-full\" alt=\"\" src=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=1200%2C250&#038;ssl=1\" data-object-fit=\"cover\" srcset=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?w=1200&amp;ssl=1 1200w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=300%2C63&amp;ssl=1 300w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=1024%2C213&amp;ssl=1 1024w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=768%2C160&amp;ssl=1 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><span aria-hidden=\"true\" class=\"wp-block-cover__background has-background-dim-30 has-background-dim\" style=\"background-color:#d3d6dc\"><\/span><div class=\"wp-block-cover__inner-container is-layout-constrained wp-container-core-cover-is-layout-15701bb7 wp-block-cover-is-layout-constrained\">\n<p class=\"has-text-align-right has-ti-fg-color is-style-default has-luminous-vivid-amber-color has-text-color has-link-color wp-elements-1 wp-block-paragraph\" style=\"font-size:clamp(21.536px, 1.346rem + ((1vw - 3.2px) * 1.374), 35px);\"><strong>Need help choosing the right product?<\/strong><\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-right is-layout-flex wp-container-core-buttons-is-layout-b507c051 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button popmake-4066 popmake-739\"><a class=\"wp-block-button__link has-ti-accent-color has-cyan-bluish-gray-background-color has-text-color has-background has-link-color wp-element-button\">Contact us<\/a><\/div>\n<\/div>\n<\/div><\/div>\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<h2 class=\"wp-block-heading\">Why ultrasonic measurement is the method of choice<\/h2>\n\n<p class=\"wp-block-paragraph\">Wind turbines bring together every reason to prefer ultrasonic measurement over traditional torque control:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Cyclic fatigue loading<\/strong>: every rotor revolution (up to 20 rpm) produces a stress cycle; over a 20-year life that is hundreds of millions of cycles. An under-sized initial tension rapidly leads to fatigue failure <\/li>\n<li><strong>Very high cost of failure<\/strong>: the failure of a blade root bolt can cause a blade to detach \u2014 a potentially catastrophic event<\/li>\n<li><strong>Limited accessibility<\/strong>: the bolts are often in positions that are hard to inspect, and corrective work after installation is expensive<\/li>\n<li><strong>Temperature variation<\/strong>: turbines operate across wide temperature ranges (from -30 to +50 \u00b0C); the automatic temperature compensation of the Dakota BT is essential here<\/li>\n<li><strong>The need for monitoring over time<\/strong>: ultrasonic measurement makes it possible to check the residual tension on the same bolt after years in service<\/li>\n<li><strong>Manufacturer-specific requirements<\/strong> (Vestas, Siemens Gamesa, GE, Nordex, Enercon) prescribe tightening procedures with tension control<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">Dakota BT applications on wind turbines<\/h2>\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"700\" src=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_bt_bolt_tension_monitor_per-applicazioni_di_misura_elongazione_bulloni.jpg?resize=700%2C700&#038;ssl=1\" alt=\"Bolt tension measurement on a wind turbine\" class=\"wp-image-187\" style=\"width:500px\" srcset=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_bt_bolt_tension_monitor_per-applicazioni_di_misura_elongazione_bulloni.jpg?w=700&amp;ssl=1 700w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_bt_bolt_tension_monitor_per-applicazioni_di_misura_elongazione_bulloni.jpg?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_bt_bolt_tension_monitor_per-applicazioni_di_misura_elongazione_bulloni.jpg?resize=150%2C150&amp;ssl=1 150w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n<h3 class=\"wp-block-heading\">Initial tightening at installation<\/h3>\n\n<p class=\"wp-block-paragraph\">During the installation of a new turbine, the tightening sequence for the foundation and tower joint bolts follows precise manufacturer procedures. The Dakota BT1-DL is used to: <\/p>\n\n<ol class=\"wp-block-list\">\n<li>measure the initial (zero-load) length of each bolt before tightening<\/li>\n<li>follow the elongation during progressive tightening (30%, 70%, 100% of target)<\/li>\n<li>verify the final tension at the end of the procedure<\/li>\n<li>go round again after the bedding-in time defined by the manufacturer (typically 24-72 h)<\/li>\n<li>record the final tension of each bolt in the commissioning report<\/li>\n<\/ol>\n\n<h3 class=\"wp-block-heading\">Periodic monitoring<\/h3>\n\n<p class=\"wp-block-paragraph\">Preventive maintenance calls for periodic checks (typically annual) of the tension in the critical bolts. The Dakota BT1-DL makes it possible to: <\/p>\n\n<ul class=\"wp-block-list\">\n<li>re-measure the length of the installed bolts and compare it with the original length<\/li>\n<li>calculate the residual tension and compare it with the allowable range<\/li>\n<li>identify bolts with abnormal relaxation that need re-tightening<\/li>\n<li>keep a historical record of the condition of each bolt through the data logger and DakMaster\u2122<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">What is specific to offshore wind<\/h2>\n\n<p class=\"wp-block-paragraph\">Offshore installations add further complexity:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Large anchor bolts to the monopile or the transition piece (M64-M80)<\/li>\n<li>A corrosive marine environment that accelerates relaxation if the installation tension is not right<\/li>\n<li>High operating costs for inspections by vessel or helicopter<\/li>\n<li>The need for rigorous documentation for asset owners and regulatory authorities<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">For very long anchor rods (beyond a few metres) the <strong>Dakota BT2-DL<\/strong> may be the right choice: according to the official data sheet it measures fasteners <strong>up to 30 metres<\/strong>.<\/p>\n\n<h2 class=\"wp-block-heading\">Recommended workflow<\/h2>\n\n<p class=\"wp-block-paragraph\">For the maintenance of a wind farm, good practice is to:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>record the <strong>reference length<\/strong> of every bolt at installation, with a unique identifier<\/li>\n<li>store all the data in <strong>DakMaster\u2122<\/strong>, organised by turbine, tower section and flange position<\/li>\n<li>set a <strong>schedule of periodic checks<\/strong> consistent with the manufacturer&#8217;s recommendations<\/li>\n<li>define <strong>alarm thresholds<\/strong> on the allowable residual tension (typically 80-85% of the initial value)<\/li>\n<li>document every inspection with an automatic DakMaster\u2122 report for traceability<\/li>\n<\/ul>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<p class=\"wp-block-paragraph\">For advice on applying the ultrasonic method to Your wind farm, <a href=\"https:\/\/ultrasuonindt.it\/en\/contact\/\">contact our technical department<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>On wind turbines the tension of the foundation, tower, hub and blade bolts is critical to structural integrity. Ultrasonic measurement with the Dakota BT1-DL allows controlled tightening and periodic monitoring to an accuracy of 0.0001 mm, independently of friction and temperature. The BT2-DL covers tie rods up to 30 metres for offshore applications.  <\/p>\n","protected":false},"author":157040980,"featured_media":2740,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_wpcom_ai_launchpad_first_post":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"{title}\n\n{excerpt}\n\n{url}","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"_wpas_customize_per_network":false,"jetpack_post_was_ever_published":false},"categories":[125],"tags":[132,115,131,137,77],"class_list":["post-8626","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-application-notes","tag-asme-pcc-1-flange-tightening","tag-asme-standards-for-ndt-inspections","tag-bolt-tension-monitor-bolt-tension","tag-ndt-inspection-in-the-power-sector","tag-thickness-measurement-on-carbon-steel"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Wind Turbine Bolt Tension Ultrasonics Dakota | RODER<\/title>\n<meta name=\"description\" content=\"Measuring wind turbine bolt tension with the Dakota BT1-DL and BT2-DL ultrasonic method. 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