{"id":2064,"date":"2023-09-01T12:20:24","date_gmt":"2023-09-01T10:20:24","guid":{"rendered":"https:\/\/tubefittings.eu\/blog\/?p=2064"},"modified":"2023-09-01T12:20:25","modified_gmt":"2023-09-01T10:20:25","slug":"quel-est-le-diametre-nominal-dn-et-le-diametre-reel-du-tuyau","status":"publish","type":"post","link":"https:\/\/tubefittings.eu\/blog\/fr\/quel-est-le-diametre-nominal-dn-et-le-diametre-reel-du-tuyau\/","title":{"rendered":"Quel est le diam\u00e8tre nominal DN et le diam\u00e8tre r\u00e9el du tuyau\u00a0?"},"content":{"rendered":"\n<p>Les tubes en acier et en aluminium sont largement utilis\u00e9s dans diverses industries. Ils sont notamment utilis\u00e9s pour cr\u00e9er diverses structures &#8211; syst\u00e8mes de s\u00e9curit\u00e9, cadres ou supports.<\/p>\n\n\n\n<p>L\u2019un des facteurs \u00e0 prendre en compte avant de les s\u00e9lectionner est le diam\u00e8tre appropri\u00e9 du tuyau. Par cons\u00e9quent, si vous vous demandez quel est le diam\u00e8tre nominal DN et le diam\u00e8tre r\u00e9el du tuyau, cet article r\u00e9pondra \u00e0 cette question.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Quelle est l\u2019importance d\u2019un diam\u00e8tre de tuyau bien choisi&nbsp;? Diam\u00e8tre nominal par rapport au diam\u00e8tre r\u00e9el<\/h2>\n\n\n\n<p>Il ne faut pas sous-estimer l\u2019importance d\u2019un bon dimensionnement des tuyaux, de leur longueur et surtout de leur diam\u00e8tre. En effet, il n\u2019est pas possible de construire un syst\u00e8me de canalisations ou toute autre structure avec un seul type de tuyau. Diff\u00e9rents types sont utilis\u00e9s, avec une gamme de longueurs et de diam\u00e8tres, et cette derni\u00e8re dimension est extr\u00eamement importante lorsqu\u2019il s\u2019agit de raccorder des sections de tuyaux individuelles.<\/p>\n\n\n\n<p>Cela suppose, entre autres, que les diff\u00e9rentes sections puissent \u00eatre interconnect\u00e9es et m\u00eame facilement remplac\u00e9es si n\u00e9cessaire. Nous nous heurtons ici \u00e0 une autre pierre d\u2019achoppement, car si vous regardez les sp\u00e9cifications, vous remarquerez certainement que deux tailles sont g\u00e9n\u00e9ralement indiqu\u00e9es :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>diam\u00e8tre nominal du tuyau DN&nbsp;;<\/li>\n\n\n\n<li>diam\u00e8tre r\u00e9el du tuyau d (ext\u00e9rieur).<\/li>\n<\/ul>\n\n\n\n<p>Ces deux dimensions doivent \u00eatre prises en compte avant de commencer les travaux de conception et d\u2019installation, mais avant cela, il est utile de conna\u00eetre leurs diff\u00e9rences, les types de tuyaux auxquels elles se rapportent et la valeur du diam\u00e8tre des tuyaux qu\u2019il est pr\u00e9f\u00e9rable d\u2019utiliser.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">D\u00e9finition du diam\u00e8tre nominal (DN)&nbsp;?<\/h2>\n\n\n\n<p>Nous commencerons par expliquer ce qu\u2019est le DN <em>(diam\u00e8tre nominal)<\/em> du tuyau. Le terme a d\u2019abord \u00e9t\u00e9 appliqu\u00e9 aux <a href=\"https:\/\/tubefittings.eu\/fr\/tubes\/tube-d-acier?utm_source=blog&amp;utm_medium=referral&amp;utm_campaign=Quel_est_le_diametre_nominal_dn_et_le_diametre_reel_du_tuyau\" target=\"_blank\" rel=\"noreferrer noopener\">tuyaux en acier<\/a>, mais il est maintenant adopt\u00e9 pour pratiquement tous les types de tuyaux. Si l\u2019on d\u00e9finit ce terme de la mani\u00e8re la plus simple, on peut dire que <strong>le diam\u00e8tre nominal DN d\u00e9finit grosso modo le diam\u00e8tre int\u00e9rieur du tuyau, exprim\u00e9 en millim\u00e8tres<\/strong>.<\/p>\n\n\n\n<p>Il est donc indiqu\u00e9 dans le syst\u00e8me m\u00e9trique, et non en pouces, qui est encore couramment utilis\u00e9. Nous soulignerons les diff\u00e9rences entre les deux plus loin dans le texte.<\/p>\n\n\n\n<p>En m\u00eame temps, le diam\u00e8tre nominal DN est conforme \u00e0 la norme europ\u00e9enne EN ISO 6708. Ce type de marquage est principalement utilis\u00e9 pour les types de tuyaux tels que&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Raccords de tuyauterie galvanis\u00e9s ou non galvanis\u00e9s pour les canalisations d\u2019eau et de gaz&nbsp;;<\/li>\n\n\n\n<li>les tuyaux en fonte, qui sont de plus en plus rares mais parfois encore utilis\u00e9s&nbsp;;<\/li>\n\n\n\n<li>les tuyaux composites, qui sont une combinaison d\u2019acier de haute qualit\u00e9 et de plastique r\u00e9sistant aux dommages&nbsp;;<\/li>\n\n\n\n<li>les tuyaux fabriqu\u00e9s uniquement en plastique, par exemple en chlorure de polyvinyle (PVC).<\/li>\n<\/ul>\n\n\n\n<p>Il est int\u00e9ressant de noter que les diam\u00e8tres nominaux et r\u00e9els diff\u00e8rent g\u00e9n\u00e9ralement de quelques millim\u00e8tres. Par exemple\u00a0: un tuyau marqu\u00e9 DN20, avec une \u00e9paisseur de paroi de 1,5\u00a0mm, a un diam\u00e8tre int\u00e9rieur non pas de 20\u00a0mm, selon le DN, mais de 22\u00a0mm. Ces impr\u00e9cisions peuvent parfois causer des difficult\u00e9s lors des travaux d\u2019installation, notamment parce que le diam\u00e8tre ext\u00e9rieur du tuyau est pris en compte lors de la jonction de tuyaux dans une canalisation, par exemple.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/tubefittings.eu\/blog\/wp-content\/uploads\/2023\/09\/Te-dangle-reglable.jpg\" alt=\"T\u00e9 d'angle r\u00e9glable\" class=\"wp-image-2067\" width=\"667\" height=\"667\" srcset=\"https:\/\/tubefittings.eu\/blog\/wp-content\/uploads\/2023\/09\/Te-dangle-reglable.jpg 700w, https:\/\/tubefittings.eu\/blog\/wp-content\/uploads\/2023\/09\/Te-dangle-reglable-300x300.jpg 300w, https:\/\/tubefittings.eu\/blog\/wp-content\/uploads\/2023\/09\/Te-dangle-reglable-150x150.jpg 150w, https:\/\/tubefittings.eu\/blog\/wp-content\/uploads\/2023\/09\/Te-dangle-reglable-500x500.jpg 500w\" sizes=\"auto, (max-width: 667px) 100vw, 667px\" \/><figcaption class=\"wp-element-caption\"><a href=\"https:\/\/tubefittings.eu\/fr\/raccords-de-tuyaux-noirs\/356-raccord-de-tuyau-angle-articule-reglable-pro-stuck-type-49b-269-mm-noir-5901138375204.html?utm_source=blog&amp;utm_medium=referral&amp;utm_campaign=Quel_est_le_diametre_nominal_dn_et_le_diametre_reel_du_tuyau\" target=\"_blank\" rel=\"noreferrer noopener\">T\u00e9 d\u2019angle r\u00e9glable Type 49B, 26,9\u00a0mm, Noir<\/a><\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Quel est le diam\u00e8tre r\u00e9el, c\u2019est-\u00e0-dire le diam\u00e8tre ext\u00e9rieur (d) du tuyau&nbsp;?<\/h2>\n\n\n\n<p>Le diam\u00e8tre ext\u00e9rieur \u00e9tant tr\u00e8s important dans le processus d\u2019assemblage, de soudage ou de scellement des tuyaux, il est n\u00e9cessaire de conna\u00eetre sa valeur. <strong>Il est d\u00e9sign\u00e9 par la lettre minuscule d <em>(diam\u00e8tre<\/em>) et par le diam\u00e8tre ext\u00e9rieur, nous entendons le diam\u00e8tre r\u00e9el du tuyau, exprim\u00e9 en millim\u00e8tres, c\u2019est-\u00e0-dire toujours dans le syst\u00e8me m\u00e9trique.<\/strong> Les normes europ\u00e9ennes DIN EN ISO d\u2019application g\u00e9n\u00e9rale s\u2019appliquent \u00e9galement \u00e0 ce domaine.<\/p>\n\n\n\n<p>Le diam\u00e8tre r\u00e9el des tuyaux d est important pour pratiquement toutes les m\u00e9thodes utilis\u00e9es pour les raccorder les uns aux autres, que l\u2019on utilise ou non&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>diverses m\u00e9thodes de soudage, par exemple vibration, court-circuit, friction, infrarouge IR, haute fr\u00e9quence, r\u00e9sistance ou \u00e9tincelle&nbsp;;<\/li>\n\n\n\n<li>collage, utilis\u00e9 pour les tuyaux en plastique.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Diam\u00e8tre nominal ou diam\u00e8tre r\u00e9el &#8211; quel est le meilleur choix&nbsp;?<\/h2>\n\n\n\n<p>Il est nettement pr\u00e9f\u00e9rable d\u2019utiliser le diam\u00e8tre ext\u00e9rieur du tuyau d plut\u00f4t que le diam\u00e8tre nominal DN, ce qui facilitera certainement l\u2019ex\u00e9cution des travaux d\u2019installation pr\u00e9vus. Cela s\u2019explique notamment par le fait que <strong>le diam\u00e8tre d est une valeur exactement mesurable et constante, quel que soit le type de tuyau, l\u2019\u00e9paisseur de sa paroi ou le mat\u00e9riau dont&nbsp; il est constitu\u00e9<\/strong>.Un autre avantage, \u00e9galement soulign\u00e9 par les experts du secteur, est la facilit\u00e9 de prendre les mesures n\u00e9cessaires et l\u2019utilisation croissante de tuyaux en plastique.<\/p>\n\n\n\n<p>La m\u00e9thode d\u2019assemblage la plus courante est le collage, qui n\u00e9cessite un ajustement plus \u00e9troit entre les surfaces \u00e0 assembler. Bien entendu, cela ne signifie pas qu\u2019il faille n\u00e9gliger le diam\u00e8tre nominal DN, qui est surtout utilis\u00e9 pour raccorder un nouveau tuyau \u00e0 une canalisation existante, par exemple dans le cas d\u2019un raccordement \u00e0 brides.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Quelles sont les dimensions \u00e0 utiliser, m\u00e9triques ou imp\u00e9riales&nbsp;?<\/h2>\n\n\n\n<p>Enfin, nous reviendrons sur la question fr\u00e9quemment pos\u00e9e de savoir s\u2019il faut utiliser les dimensions m\u00e9triques ou imp\u00e9riales. Soyons honn\u00eates, donner le diam\u00e8tre d\u2019un tuyau en pouces, parler d\u2019un tuyau d\u2019un demi-pouce ou d\u2019un \u00be de pouce, rel\u00e8ve plus d\u2019une habitude de longue date que de la commodit\u00e9. En Europe, c\u2019est le syst\u00e8me m\u00e9trique qui s\u2019applique, vous devez donc commencer \u00e0 l\u2019utiliser, et vous trouverez facilement des tableaux en ligne pour vous aider \u00e0 convertir le diam\u00e8tre d\u2019un tuyau du pouce au syst\u00e8me m\u00e9trique ou vice versa, si vous ne voulez toujours pas changer vos habitudes.<\/p>\n\n\n<div class=\"pswp-if-wrp\"><iframe src=\"https:\/\/tubefittings.eu\/module\/prestawp\/products?1&category_ids=10&limit=8&limit_mobile=4&content_only=1&isolang=pl\" class=\"pswp-iframe\" frameborder=\"0\" scrolling=\"no\" onload=\"pswp_hideLoader(this)\"><\/iframe><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Les tubes en acier et en aluminium sont largement utilis\u00e9s dans diverses [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":393,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[617,814],"tags":[],"class_list":["post-2064","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-structures-de-tuyaux","category-systemes-de-tuyauterie-modernes","col-md-12"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Quel est le diam\u00e8tre nominal DN et le diam\u00e8tre r\u00e9el du tuyau\u00a0?<\/title>\n<meta name=\"description\" content=\"Savez-vous ce qu\u2019est le diam\u00e8tre nominal par rapport au diam\u00e8tre r\u00e9el d\u2019un tuyau ? 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