{"id":372,"date":"2026-10-12T03:03:38","date_gmt":"2026-10-12T03:03:38","guid":{"rendered":"https:\/\/coolantcentrifuge.com\/?p=372"},"modified":"2026-11-06T08:42:13","modified_gmt":"2026-11-06T08:42:13","slug":"grinding-coolant-nozzle-blockage","status":"publish","type":"post","link":"https:\/\/coolantcentrifuge.com\/fr\/grinding-coolant-nozzle-blockage\/","title":{"rendered":"Blocage de la buse de liquide de refroidissement de rectification : diagnostiquer le r\u00e9tr\u00e9cissement avant d'ajouter une filtration"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"372\" class=\"elementor elementor-372 elementor-bc-flex-widget\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-s05blog e-con-full vf-blog-template e-flex e-con e-parent\" data-id=\"s05blog\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-s05hero elementor-widget elementor-widget-html\" data-id=\"s05hero\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<style>\/* Reusable article layout; vf-blog-template only. The post-specific outer width guard is supplied separately. *\/\n.vf-blog-template{color:#3d3d3d;font-family:Arial,sans-serif;--vf-gap:56px}\n.vf-blog-template,.vf-blog-template *{box-sizing:border-box}\n.vf-blog-template .e-con{--padding-top:0px;--padding-bottom:0px;--padding-left:0px;--padding-right:0px;--gap:0px;overflow:visible}\n.vf-blog-template .vf-blog-hero{width:100%;padding:34px 0 30px;border-bottom:1px solid #d9d9d9;margin-bottom:32px}\n.vf-blog-template .vf-blog-crumb{font-size:13px;line-height:1.7;color:#6b6b6b;margin:0 0 22px}\n.vf-blog-template a{color:inherit;text-underline-offset:3px}\n.vf-blog-template h1{font-size:clamp(30px,3.3vw,46px);line-height:1.18;letter-spacing:-.025em;max-width:950px;margin:0 0 22px;color:#303638}\n.vf-blog-template .vf-blog-meta{display:flex;flex-wrap:wrap;gap:10px 22px;font-size:13px;color:#626b6e;align-items:center}\n.vf-blog-template .vf-blog-category{font-size:11px;font-weight:700;letter-spacing:.08em;padding:5px 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figcaption{font-size:12px;color:#626b6e;line-height:1.6;margin-top:10px}\n.vf-blog-template .vf-blog-toc{background:#f4f4f4;border:1px solid #dedede;border-radius:8px;padding:22px}\n.vf-blog-template .vf-blog-toc strong{display:block;font-size:15px;margin-bottom:16px}\n.vf-blog-template .vf-blog-toc ol{padding:0;list-style:none;margin:0;counter-reset:section}\n.vf-blog-template .vf-blog-toc li{font-size:13px;line-height:1.45;margin:0;border-top:1px solid #dedede;counter-increment:section}\n.vf-blog-template .vf-blog-toc a{display:flex;gap:10px;text-decoration:none;padding:12px 0;color:#626b6e}\n.vf-blog-template .vf-blog-toc a:before{content:counter(section,decimal-leading-zero);font-size:11px;color:#888;flex-shrink:0;line-height:1.8}\n.vf-blog-template .vf-blog-toc a:hover,.vf-blog-template .vf-blog-toc a[aria-current=true]{color:#222;font-weight:700}\n.vf-blog-template .vf-blog-related{border-top:1px solid #dedede;margin-top:22px;padding-top:18px;font-size:13px;line-height:1.7}\n.vf-blog-template .vf-blog-related strong{display:block;font-size:11px;letter-spacing:.08em;color:#6b6b6b;margin-bottom:7px}\n.vf-blog-template .vf-blog-mobile{display:none}\n.vf-blog-template .vf-s05-cta{margin:36px 0 48px;padding:24px;background:#f4f4f4;border-radius:8px}\n.vf-blog-template .vf-s05-cta h2{margin-top:0}\n.vf-blog-template .vf-s05-button{display:inline-block;padding:12px 20px;background:#3d3d3d;color:#fff;text-decoration:none;border-radius:4px}\n.vf-blog-template .vf-s05-button:hover{background:#565656;color:#fff}\n.vf-blog-template a:focus-visible,.vf-blog-template summary:focus-visible{outline:2px solid #3d3d3d;outline-offset:4px}\n@media(max-width:1024px){.vf-blog-template .vf-blog-columns{grid-template-columns:minmax(0,1fr)}.vf-blog-template .vf-blog-sidebar{display:none}.vf-blog-template .vf-blog-mobile{display:block;margin-top:24px}.vf-blog-template summary{cursor:pointer;font-size:15px;font-weight:700;min-height:44px;display:list-item;padding:10px 0}.vf-blog-template .vf-blog-mobile .vf-blog-toc{padding:12px 20px}.vf-blog-template .vf-blog-toc a{min-height:44px}}\n@media(max-width:600px){.vf-blog-template .vf-blog-hero{padding:22px 0;margin-bottom:24px}.vf-blog-template h2{font-size:24px}.vf-blog-template p,.vf-blog-template li{font-size:16px}.vf-blog-template .vf-blog-meta{gap:8px 14px}.vf-blog-template .vf-blog-crumb{font-size:12px}.vf-blog-template .vf-s05-cta{padding:20px}}\n.postid-372 #content > .ast-container{max-width:1180px;padding-left:24px;padding-right:24px}.postid-372 .elementor-372{width:100%}.vf-blog-template{background:#fff;padding:0 32px 24px!important}@media(max-width:600px){.postid-372 #content > .ast-container{padding-left:12px;padding-right:12px}.vf-blog-template{padding:0 16px 12px!important}}<\/style><header class=\"vf-blog-hero\"><nav class=\"vf-blog-crumb\" aria-label=\"Breadcrumb\"><a href=\"https:\/\/coolantcentrifuge.com\/\">Home<\/a> \/ <a href=\"https:\/\/coolantcentrifuge.com\/grinding-coolant-filtration\/\">Grinding Coolant Filtration<\/a> \/ Troubleshooting<\/nav><h1>Grinding Coolant Nozzle Blockage: Diagnose the Restriction Before Adding Filtration<\/h1><div class=\"vf-blog-meta\"><span class=\"vf-blog-category\">TROUBLESHOOTING<\/span><time datetime=\"2026-10-12\">October 12, 2026<\/time><span>6 min read<\/span><\/div><div class=\"vf-blog-mobile\"><details class=\"vf-blog-toc\"><summary>In this article<\/summary><nav aria-label=\"Article contents\"><ol><li><a href=\"#s05-section-1\">Confirm whether the nozzle is actually obstructed<\/a><\/li><li><a href=\"#s05-section-2\">Identify what is caught at the restriction<\/a><\/li><li><a href=\"#s05-section-3\">Inspect the last treatment stage before the nozzle<\/a><\/li><li><a href=\"#s05-section-4\">Look for contamination introduced downstream<\/a><\/li><li><a href=\"#s05-section-5\">Decide what a separation stage can contribute<\/a><\/li><li><a href=\"#s05-section-6\">Test the correction against a defined baseline<\/a><\/li><li><a href=\"#s05-section-7\">Prepare the information needed for a useful recommendation<\/a><\/li><\/ol><\/nav><\/details><\/div><\/header>\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-s05cols e-con-full vf-blog-columns e-flex e-con e-parent\" data-id=\"s05cols\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-s05body e-con-full vf-blog-body e-flex e-con e-parent\" data-id=\"s05body\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-s05c000 e-con-full vf-s05-section e-flex e-con e-parent\" data-id=\"s05c000\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-s05w000 elementor-widget elementor-widget-html\" data-id=\"s05w000\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section class=\"vf-s05\"><div class=\"vf-s05-inner\">\n<p>Grinding coolant nozzle blockage is one possible explanation for a weak or uneven coolant jet, but it is not the only one. A supply problem, loaded strainer, changed valve position or damaged nozzle can produce similar symptoms. Repeatedly cleaning the nozzle without checking the upstream system may leave the original fault in place.<\/p>\n<p>Start by locating the restriction and identifying what was removed. This guide concerns solids-related investigation in grinding coolant circuits. Machine operating limits, nozzle setup and maintenance work must follow the grinder manufacturer&#x27;s instructions; a general filtration guide cannot specify the correct jet or pressure for every grinding process.<\/p>\n<\/div><\/section>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-s05c001 e-con-full vf-s05-section e-flex e-con e-parent\" data-id=\"s05c001\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-s05w001 elementor-widget elementor-widget-html\" data-id=\"s05w001\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section class=\"vf-s05\"><div class=\"vf-s05-inner\"><h2 id=\"s05-section-1\">Confirm whether the nozzle is actually obstructed<\/h2>\n<p>Record the observed change before dismantling anything: one nozzle affected or several, a gradual reduction or a sudden loss, and whether the problem appears after startup or during a particular operation. These distinctions help the maintenance team decide where to inspect first.<\/p>\n<p>Use installed instrumentation and approved checks to review the supply condition. A pressure reading at one point does not establish adequate flow at the nozzle. Equally, a poor-looking jet does not establish that particles are lodged inside it. Interpret the available readings against the machine&#x27;s specified arrangement.<\/p>\n<p>Isolate equipment and release stored energy through the site&#x27;s maintenance procedure before opening components. Do not try to clear a restriction on a running grinder or probe a pressurized nozzle. Preserve the removed material when its identity may explain the recurring problem.<\/p>\n<\/div><\/section>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-s05c002 e-con-full vf-s05-section e-flex e-con e-parent\" data-id=\"s05c002\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-s05w002 elementor-widget elementor-widget-html\" data-id=\"s05w002\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section class=\"vf-s05\"><div class=\"vf-s05-inner\"><h2 id=\"s05-section-2\">Identify what is caught at the restriction<\/h2>\n<p>Place material removed from the nozzle or strainer in a labelled container and record its source. Is it recognizably long debris, fine particulate sludge, fragments of another component or an unidentified deposit? Photographs can document shape, but composition may require closer examination or laboratory analysis.<\/p>\n<p>Do not call every blockage grinding fines. Mixed debris may enter from a maintenance activity, damaged component or another part of a shared coolant system. If contamination reappears soon after cleaning, compare the newly collected material with the first sample rather than assuming the mechanism is unchanged.<\/p>\n<p>Avoid assigning a particle-size requirement from a photograph. The relevant information includes the obstruction geometry, the material being trapped and the machine supplier&#x27;s coolant cleanliness requirements. Those inputs define what the upstream treatment must address.<\/p>\n<\/div><\/section>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-s05c003 e-con-full vf-s05-section e-flex e-con e-parent\" data-id=\"s05c003\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-s05w003 elementor-widget elementor-widget-html\" data-id=\"s05w003\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section class=\"vf-s05\"><div class=\"vf-s05-inner\"><h2 id=\"s05-section-3\">Inspect the last treatment stage before the nozzle<\/h2>\n<p>Trace the supply from the tank through pumps, screens, filters and distribution pipework. Identify the final protective element before the nozzle. Check its condition and whether there is an operating path around it, using the manufacturer&#x27;s inspection procedure.<\/p>\n<p>A damaged or incorrectly installed element may allow larger material through even when the system has substantial treatment capacity elsewhere. Conversely, an intact element that loads rapidly may indicate a feed problem or maintenance issue rather than a need to alter the nozzle itself.<\/p>\n<p>Retain the distinction between tank cleanup and final supply protection. A bypass treatment loop can reduce circulating contamination over time, but it does not necessarily intercept every particle on its way to the nozzle. The actual arrangement determines that protection.<\/p>\n<figure style=\"width:1448px\" data-media-id=\"348\"><a href=\"https:\/\/coolantcentrifuge.com\/wp-content\/uploads\/2026\/10\/grinding-coolant-nozzle-blockage-detail.png\" target=\"_blank\" rel=\"noopener\" aria-label=\"Open full-size image\"><img loading=\"lazy\" src=\"https:\/\/coolantcentrifuge.com\/wp-content\/uploads\/2026\/10\/grinding-coolant-nozzle-blockage-detail.png\" alt=\"Industrial fluid-handling equipment with a cylindrical housing, hoses and a tank\" width=\"1448\" height=\"1086\" loading=\"lazy\" decoding=\"async\"><\/a><figcaption>Upstream fluid-handling equipment; nozzle obstruction must be checked separately. <a href=\"https:\/\/coolantcentrifuge.com\/wp-content\/uploads\/2026\/10\/grinding-coolant-nozzle-blockage-detail.png\" target=\"_blank\" rel=\"noopener\">View full size<\/a><\/figcaption><\/figure>\n<figure style=\"width:1200px\" data-media-id=\"354\"><a href=\"https:\/\/coolantcentrifuge.com\/wp-content\/uploads\/2026\/10\/grinding-coolant-nozzle-supply-path.webp\" target=\"_blank\" rel=\"noopener\" aria-label=\"Open full-size image\"><img loading=\"lazy\" src=\"https:\/\/coolantcentrifuge.com\/wp-content\/uploads\/2026\/10\/grinding-coolant-nozzle-supply-path.webp\" alt=\"Schematic: nozzle supply: inspect the complete path\" width=\"1200\" height=\"900\" loading=\"lazy\" decoding=\"async\"><\/a><figcaption>Schematic. Separate an obstruction from low supply flow or another fault. Schematic inspection sequence; isolate equipment before access. <a href=\"https:\/\/coolantcentrifuge.com\/wp-content\/uploads\/2026\/10\/grinding-coolant-nozzle-supply-path.webp\" target=\"_blank\" rel=\"noopener\">View full size<\/a><\/figcaption><\/figure>\n<\/div><\/section>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-s05c004 e-con-full vf-s05-section e-flex e-con e-parent\" data-id=\"s05c004\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-s05w004 elementor-widget elementor-widget-html\" data-id=\"s05w004\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section class=\"vf-s05\"><div class=\"vf-s05-inner\"><h2 id=\"s05-section-4\">Look for contamination introduced downstream<\/h2>\n<p>If material is found at the nozzle despite suitable upstream protection, inspect the section between the protective stage and the nozzle. Maintenance debris or deterioration within that section should be considered rather than automatically blaming the sump.<\/p>\n<p>Review recent hose replacements, component work and cleaning activities. Record the timing of the blockage relative to those changes. A problem that began after an intervention warrants inspection of the modified section before an equipment upgrade is specified.<\/p>\n<p>Do not enlarge a nozzle opening as an informal fix. Changing its geometry may change coolant delivery to the grinding zone. Any change should be reviewed against the process requirements, not judged only by whether the opening is less likely to obstruct.<\/p>\n<\/div><\/section>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-s05c005 e-con-full vf-s05-section e-flex e-con e-parent\" data-id=\"s05c005\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-s05w005 elementor-widget elementor-widget-html\" data-id=\"s05w005\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section class=\"vf-s05\"><div class=\"vf-s05-inner\"><h2 id=\"s05-section-5\">Decide what a separation stage can contribute<\/h2>\n<p>Where suspended solids in the circulating coolant are the confirmed source, a separation trial can help evaluate an upstream treatment option. Supply the actual coolant and solids, including information about abrasive material, workpiece material and existing treatment. For carbide tool grinding, use the sampling points in the <a href=\"https:\/\/coolantcentrifuge.com\/carbide-grinding-coolant-filtration\/\">tool grinder coolant separation guide<\/a> to compare the separator inlet and return during the same run.<\/p>\n<p>A centrifuge is not a universal barrier with a fixed pore opening. Its result depends on the feed and operating conditions. A satisfactory sample result therefore needs to be connected to the proposed installation and to any remaining requirement for protective screening or filtration.<\/p>\n<p>Ask the test provider what was measured in the treated liquid and what remained. Do not use a clearer bottle as proof that every particle capable of blocking a particular nozzle has been removed. The test objective should reflect the obstruction mechanism identified during maintenance.<\/p>\n<\/div><\/section>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-s05c006 e-con-full vf-s05-section e-flex e-con e-parent\" data-id=\"s05c006\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-s05w006 elementor-widget elementor-widget-html\" data-id=\"s05w006\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section class=\"vf-s05\"><div class=\"vf-s05-inner\"><h2 id=\"s05-section-6\">Test the correction against a defined baseline<\/h2>\n<p>Select a repeatable observation, such as interventions on the same nozzle or loading of a specified strainer over a recorded production period. Keep the nozzle configuration, measurement method and production details in the comparison record.<\/p>\n<p>If several changes are made together, explain that the result reflects the combined intervention. Cleaning a tank, replacing a damaged element and installing a separator at the same time does not isolate the contribution of each action. That does not invalidate the improvement, but it limits the claim you can make about its cause.<\/p>\n<p>Also check that the original delivery requirement is being met. A nozzle that stays clear is not a successful outcome if the coolant supply no longer satisfies the grinding process. Review the result with the machine and process teams, not only the treatment supplier.<\/p>\n<\/div><\/section>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-s05c007 e-con-full vf-s05-section e-flex e-con e-parent\" data-id=\"s05c007\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-s05w007 elementor-widget elementor-widget-html\" data-id=\"s05w007\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section class=\"vf-s05\"><div class=\"vf-s05-inner\"><h2 id=\"s05-section-7\">Prepare the information needed for a useful recommendation<\/h2>\n<p>For the maintenance record, separate these findings instead of writing only &quot;nozzle cleaned&quot;:<\/p>\n<ul><li>The affected outlet and the observed delivery problem before intervention.<\/li><li>The component opened and the location of any actual obstruction.<\/li><li>The appearance and retained sample identification of removed material.<\/li><li>The approved corrective action and the subsequent delivery check.<\/li><\/ul>\n<p>If nothing was found inside the nozzle, record that too. A negative finding is useful evidence for moving the investigation upstream rather than repeatedly treating an unconfirmed blockage.<\/p>\n<p>Provide the grinder type, coolant product, workpiece and abrasive information, the affected nozzle arrangement and a sketch of the supply circuit. Add photographs of the removed obstruction and any available flow or pressure records, clearly stating where they were measured.<\/p>\n<p>The <a href=\"https:\/\/coolantcentrifuge.com\/grinding-coolant-filtration\/\">grinding coolant filtration guide<\/a> provides the broader solids-control context. For recurring nozzle blockage, the next step is a targeted review of the restriction and protection path. That approach avoids buying treatment equipment for a problem that actually originates in a hose, component or supply setting.<\/p><\/div><\/section>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-s05c008 e-con-full vf-s05-section e-flex e-con e-parent\" data-id=\"s05c008\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-s05w008 elementor-widget elementor-widget-html\" data-id=\"s05w008\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section class=\"vf-s05\"><div class=\"vf-s05-inner vf-s05-cta\"><h2>Discuss Your Grinding Coolant<\/h2><p>Share the coolant details, obstruction observations and supply circuit.<\/p><a class=\"vf-s05-button\" href=\"https:\/\/coolantcentrifuge.com\/contact\/\">Request a Technical Review \u2192<\/a><\/div><\/section>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-s05side e-con-full vf-blog-sidebar e-flex e-con e-parent\" data-id=\"s05side\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-s05toc elementor-widget elementor-widget-html\" data-id=\"s05toc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<aside><nav class=\"vf-blog-toc\" aria-label=\"Article contents\"><strong>In this article<\/strong><ol><li><a href=\"#s05-section-1\">Confirm whether the nozzle is actually obstructed<\/a><\/li><li><a href=\"#s05-section-2\">Identify what is caught at the restriction<\/a><\/li><li><a href=\"#s05-section-3\">Inspect the last treatment stage before the nozzle<\/a><\/li><li><a href=\"#s05-section-4\">Look for contamination introduced downstream<\/a><\/li><li><a href=\"#s05-section-5\">Decide what a separation stage can contribute<\/a><\/li><li><a href=\"#s05-section-6\">Test the correction against a defined baseline<\/a><\/li><li><a href=\"#s05-section-7\">Prepare the information needed for a useful recommendation<\/a><\/li><\/ol><\/nav><div class=\"vf-blog-related\"><strong>RELATED APPLICATION<\/strong><a href=\"https:\/\/coolantcentrifuge.com\/grinding-coolant-filtration\/\">Grinding Coolant Filtration \u2192<\/a><\/div><\/aside>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-s05js elementor-widget elementor-widget-html\" data-id=\"s05js\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<script>(()=>{const root=document.querySelector('.vf-blog-template');if(!root)return;const links=[...root.querySelectorAll('.vf-blog-toc a')];const headings=[...root.querySelectorAll('h2[id]')];function sync(){let current=headings[0];for(const h of 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l'obstruction, le chemin d'alimentation et la protection en amont avant de sp\u00e9cifier un traitement suppl\u00e9mentaire des 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