{"id":12851,"date":"2026-03-16T08:00:08","date_gmt":"2026-03-16T07:00:08","guid":{"rendered":"https:\/\/blog.wika.com\/fr\/?p=12851"},"modified":"2026-03-12T17:41:52","modified_gmt":"2026-03-12T16:41:52","slug":"tube-de-pitot-equations-erreurs-oil-gas","status":"publish","type":"post","link":"https:\/\/blog.wika.com\/fr\/general\/tube-de-pitot-equations-erreurs-oil-gas\/","title":{"rendered":"Tube de Pitot : principe, \u00e9quations, conditions de mesure et sources d\u2019erreurs en Oil &#038; Gas"},"content":{"rendered":"<p><strong>Dans l\u2019Oil &amp; Gas (upstream, midstream, downstream), une mesure de d\u00e9bit fiable sert autant au pilotage op\u00e9rationnel qu\u2019\u00e0 la s\u00e9curit\u00e9 et au suivi de performance. Le tube de Pitot reste un \u00e9l\u00e9ment primaire tr\u00e8s utilis\u00e9 lorsqu\u2019on cherche une solution robuste, simple \u00e0 int\u00e9grer \u00e0 une cha\u00eene pression diff\u00e9rentielle (DP), et surtout avec une perte de charge non r\u00e9cup\u00e9r\u00e9e tr\u00e8s faible. Dans la gamme WIKA, <a href=\"https:\/\/www.wika.com\/fr-fr\/flc_apt_e_flc_apt_f.WIKA?highlightedText=flotec\" rel=\"external\" target=\"_blank\">les tubes de Pitot FloTec existent en version extractible (FLC-APT-E) et version fixe (FLC-APT-F).<\/a><\/strong><\/p>\n<h2>Tube de Pitot : origine et rappel de d\u00e9finition (Henri Pitot)<\/h2>\n\n      <div class=\"wp-caption alignright\" style=\"max-width:301px;\"><img decoding=\"async\" src=\"https:\/\/blog.wika.com\/fr\/files\/2026\/02\/w12_flc_apt_e_flc_apt_f_en_co_rs_w700_h700_image-388x388.jpg\" \/><p class=\"wp-caption-text\">FLC-APT-E, tube de Pitot, version extractible<\/p><\/div>\n    \n<p>Le dispositif est associ\u00e9 \u00e0 Henri Pitot (1695\u20131771), ing\u00e9nieur fran\u00e7ais connu pour ses travaux en hydraulique. Le principe consiste \u00e0 exploiter la diff\u00e9rence entre une pression totale (point de stagnation) et une pression statique pour remonter \u00e0 la vitesse d\u2019\u00e9coulement.<\/p>\n<h2>Principe du tube de Pitot : pression statique, pression dynamique, pression totale<\/h2>\n<p>On consid\u00e8re un tube cylindrique plac\u00e9 parall\u00e8lement aux lignes de courant dans un \u00e9coulement permanent uniforme. Il comporte une prise de pression totale \u00e0 l\u2019extr\u00e9mit\u00e9 amont (point de stagnation) et une prise de pression statique sur la p\u00e9riph\u00e9rie. La diff\u00e9rence entre ces deux pressions correspond \u00e0 la part \u201cdynamique\u201d de l\u2019\u00e9coulement, exploitable via le principe de Bernoulli.<\/p>\n<p>Du point de vue instrumentation, cela fournit naturellement une mesure DP directement exploitable (manom\u00e8tre diff\u00e9rentiel, transmetteur DP, etc.).<\/p>\n<h2>\u00c9quations du tube de Pitot : calcul de vitesse \u00e0 partir de \u0394p<\/h2>\n<p>La relation fondamentale s\u2019\u00e9crit :<\/p>\n<ul>\n<li>\u00a0`\u0394p = p_total \u2212 p_static`<\/li>\n<li>\u00a0`V = (2*\u0394p\/\u03c1)^(1\/2)`<\/li>\n<\/ul>\n<p>Dans la formulation acad\u00e9mique de votre document, on peut aussi \u00e9crire :<\/p>\n<ul>\n<li>`V = (2*(pA \u2212 pB)\/\u03c1)^(1\/2)`<\/li>\n<\/ul>\n<p>o\u00f9 `pA` est la pression totale, `pB` la pression statique, et `\u03c1` la masse volumique (densit\u00e9) du fluide.<\/p>\n<p>Le texte rappelle qu\u2019\u00e0 conditions normales pour l\u2019air (1013 hPa, 15 \u00b0C), `\u03c1 = 1,25 kg\/m\u00b3`.<\/p>\n<p>Dans un cadre p\u00e9dagogique, on relie parfois la vitesse \u00e0 une d\u00e9nivellation sur manom\u00e8tre \u00e0 eau : en exprimant `dp` en millim\u00e8tres d\u2019eau, on obtient une approximation du type :<\/p>\n<ul>\n<li>`V \u2248 4*(dp)^(1\/2)` (V en m\/s ; dp en mmH2O)<\/li>\n<\/ul>\n<h2>Du tube de Pitot au d\u00e9bit : ce que \u201ccalcule\u201d r\u00e9ellement la cha\u00eene de mesure<\/h2>\n<p>Le tube de Pitot mesure une diff\u00e9rence de pression li\u00e9e \u00e0 la vitesse (locale ou moyenn\u00e9e selon le design). Sur un mod\u00e8le industriel comme le FloTec, on calcule le d\u00e9bit volum\u00e9trique \u00e0 partir de la diff\u00e9rence entre la pression statique et la pression dynamique selon Bernoulli, en tenant compte du diam\u00e8tre int\u00e9rieur de la conduite.<\/p>\n<p>Un point d\u00e9terminant pour la rigueur de mesure est la lecture du profil d\u2019\u00e9coulement : l\u2019utilisation de quatre ports dynamiques permet d\u2019\u00e9valuer un meilleur profil de vitesse dans le tuyau, ce qui am\u00e9liore la pr\u00e9cision globale.<\/p>\n<h2>Tube de Pitot en <a href=\"https:\/\/www.wika.com\/fr-fr\/industrie_du_petrole_et_du_gaz_up_mid_et_downstream.WIKA\" rel=\"external\" target=\"_blank\">Oil &amp; Gas<\/a> : applications typiques et int\u00e9r\u00eat op\u00e9rationnel<\/h2>\n<p>Les applications couvrent des environnements Oil &amp; Gas et process : production et raffinage de p\u00e9trole, traitement et transport de gaz, ainsi que l\u2019industrie chimique et p\u00e9trochimique.<\/p>\n<p>Sur le plan exploitation, les caract\u00e9ristiques souvent recherch\u00e9es sont la compatibilit\u00e9 liquides, gaz et vapeur, une pr\u00e9cision stable dans le temps, et surtout une perte de charge non r\u00e9cup\u00e9r\u00e9e tr\u00e8s faible, avantage direct sur l\u2019\u00e9nergie et l\u2019efficacit\u00e9 du r\u00e9seau.<\/p>\n<h2>Conditions de mesure : quand un tube de Pitot est pertinent (et quand il ne l\u2019est pas)<\/h2>\n<p>Pour rester rigoureux, l\u2019usage doit \u00eatre cadr\u00e9. Le tub de Pitot est indiqu\u00e9 pour des milieux monophas\u00e9s qui remplissent compl\u00e8tement la section de la conduite. En Oil &amp; Gas, c\u2019est un point de vigilance : si l\u2019\u00e9coulement devient multiphas\u00e9 (poches, entra\u00eenements, r\u00e9gimes instables), la relation entre `\u0394p` et la vitesse perd sa repr\u00e9sentativit\u00e9.<\/p>\n<p>La g\u00e9om\u00e9trie de conception et l\u2019implantation influencent aussi fortement le r\u00e9sultat : un tube de Pitot est un instrument de mesure sensible \u00e0 la mani\u00e8re dont il est con\u00e7u et install\u00e9.<\/p>\n<h2>Sources d\u2019erreurs : profil d\u2019\u00e9coulement, vortex, instrumentation DP<\/h2>\n<p><strong>Profil de vitesse et perturbations en amont<br \/>\n<\/strong>La difficult\u00e9 principale est d\u2019obtenir une vitesse repr\u00e9sentative du profil r\u00e9el. L\u2019int\u00e9r\u00eat d\u2019un tube de Pitot multi-ports est pr\u00e9cis\u00e9ment d\u2019am\u00e9liorer cette repr\u00e9sentativit\u00e9, en limitant l\u2019effet de profils d\u00e9form\u00e9s (dans certaines limites).<\/p>\n<p><strong>Vortex et vibrations<br \/>\n<\/strong>Selon le diam\u00e8tre int\u00e9rieur, les caract\u00e9ristiques du fluide et le nombre de Reynolds, un vortex peut se g\u00e9n\u00e9rer autour du tube de Pitot. Si la fr\u00e9quence propre du tube de Pitot co\u00efncide avec la fr\u00e9quence de d\u00e9tachement tourbillonnaire, un support mont\u00e9 c\u00f4t\u00e9 oppos\u00e9 peut \u00eatre requis ; le besoin est v\u00e9rifi\u00e9 au calcul durant la phase de conception.<\/p>\n<p><strong>Cha\u00eene de mesure DP (transmetteur \/ indication \/ seuil)<br \/>\n<\/strong>On connecte normalement la sortie DP du tube \u00e0 un transmetteur de pression diff\u00e9rentielle pour g\u00e9n\u00e9rer un signal \u00e9lectrique proportionnel au d\u00e9bit. Pour l\u2019exploitation, on peut aussi utiliser un manom\u00e8tre diff\u00e9rentiel (indication locale) ou un pressostat diff\u00e9rentiel (seuil).<\/p>\n<h2>Tube de Pitot fixe ou extractible : crit\u00e8res de choix (FLC-APT-F \/ FLC-APT-E)<\/h2>\n\n      <div class=\"wp-caption alignright\" style=\"max-width:284px;\"><img decoding=\"async\" src=\"https:\/\/blog.wika.com\/fr\/files\/2026\/02\/w12_flc_apt_e_flc_apt_f_2_en_co_rs_w700_h700_image-388x388.jpg\" \/><p class=\"wp-caption-text\">Tube de Pitot, version fix\u00e9, type FLC-APT-F<\/p><\/div>\n    \n<p>Les deux versions existent : fixe et extractible. Dans une logique Oil &amp; Gas, l\u2019arbitrage est souvent li\u00e9 \u00e0 l\u2019exploitation (accessibilit\u00e9, maintenance, conditions de proc\u00e9d\u00e9). Les points structurants restent la simplicit\u00e9 d\u2019int\u00e9gration, le faible impact en perte de charge, et l\u2019ad\u00e9quation mat\u00e9riaux\/proc\u00e9d\u00e9.<\/p>\n<p>&nbsp;<\/p>\n<h2>FAQ \u2013 Tube de Pitot : principe, \u00e9quations et erreurs en Oil &amp; Gas<\/h2>\n<p><strong>Quelle \u00e9quation relie un tube de Pitot \u00e0 la vitesse d\u2019\u00e9coulement ?<br \/>\n<\/strong>`V = (2*\u0394p\/\u03c1)^(1\/2)` avec `\u0394p = p_total \u2212 p_static`.<\/p>\n<p><strong>Pourquoi utiliser plusieurs ports dynamiques ?<br \/>\n<\/strong>Pour \u00e9valuer un profil de vitesse plus repr\u00e9sentatif dans la conduite et am\u00e9liorer l\u2019exactitude.<\/p>\n<p><strong>Quels milieux peut-on mesurer ?<br \/>\n<\/strong>Liquides, gaz et vapeur, \u00e0 condition d\u2019\u00eatre en monophas\u00e9 et conduite pleine.<\/p>\n<p><strong>Pourquoi parle-t-on de vortex et de support ?<br \/>\n<\/strong>Un d\u00e9tachement tourbillonnaire peut exciter m\u00e9caniquement la sonde ; si le calcul le justifie, on peut pr\u00e9voir un support oppos\u00e9.<\/p>\n<p>&nbsp;<\/p>\n<p>Vous avez besoin de plus d&rsquo;informations sur la <a href=\"https:\/\/www.wika.com\/fr-fr\/mesure_de_debit.WIKA\" rel=\"external\" target=\"_blank\">mesure du d\u00e9bit<\/a> ?<br \/>\nVous pouvez par ailleurs visiter notre <a href=\"https:\/\/www.wika.com\/fr-fr\/page_d_accueil.WIKA\" rel=\"external\" target=\"_blank\">site internet<\/a>.<br \/>\nEt n&rsquo;h\u00e9sitez pas \u00e0 <a href=\"https:\/\/www.wika.com\/fr-fr\/formulaire_de_contact.WIKA\" rel=\"external\" target=\"_blank\">nous contacter<\/a>, nos experts se feront un plaisir de vous aider.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dans l\u2019Oil &amp; Gas (upstream, midstream, downstream), une mesure de d\u00e9bit fiable sert autant au pilotage op\u00e9rationnel qu\u2019\u00e0 la s\u00e9curit\u00e9 et au suivi de performance. Le tube de Pitot reste un \u00e9l\u00e9ment primaire tr\u00e8s utilis\u00e9 lorsqu\u2019on cherche une solution robuste, simple \u00e0 int\u00e9grer \u00e0 une cha\u00eene pression diff\u00e9rentielle (DP), et surtout avec une perte de [&hellip;]<\/p>\n","protected":false},"author":164,"featured_media":12865,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1,619],"tags":[616,550,631],"class_list":["post-12851","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general","category-know-how","tag-mesure-de-debit","tag-oil-and-gaz","tag-tube-de-pitot"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Tube de Pitot : \u00e9quations &amp; erreurs Oil &amp; Gas- Blog WIKA<\/title>\n<meta name=\"description\" content=\"Tube de Pitot en Oil &amp; Gas : principe, \u00e9quation \u0394p-vitesse, conditions de mesure et erreurs courantes pour fiabiliser la mesure de d\u00e9bit.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.wika.com\/fr\/general\/tube-de-pitot-equations-erreurs-oil-gas\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Tube de Pitot : \u00e9quations &amp; 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