{"id":8298,"date":"2019-07-15T10:05:11","date_gmt":"2019-07-15T08:05:11","guid":{"rendered":"https:\/\/blog.wika.com\/fr\/?p=8298"},"modified":"2019-07-12T18:06:12","modified_gmt":"2019-07-12T16:06:12","slug":"installation-dune-mesure-de-niveau-sur-un-systeme-de-support-de-joint-pour-unite-alkylation-du-site-neste-oil-porvoo-en-finlande","status":"publish","type":"post","link":"https:\/\/blog.wika.com\/fr\/applications\/installation-dune-mesure-de-niveau-sur-un-systeme-de-support-de-joint-pour-unite-alkylation-du-site-neste-oil-porvoo-en-finlande\/","title":{"rendered":"Installation d\u2019une mesure de niveau sur un syst\u00e8me de support de joint pour l&rsquo;unit\u00e9 d&rsquo;alkylation du site Neste Oil Porvoo en Finlande"},"content":{"rendered":"<p>Dans un proc\u00e9d\u00e9 de raffinage du p\u00e9trole classique, l&rsquo;isobutane est combin\u00e9 avec des alc\u00e8nes de faible poids mol\u00e9culaire (principalement du propyl\u00e8ne et du butyl\u00e8ne) en pr\u00e9sence d&rsquo;un catalyseur acide fort, soit l&rsquo;acide sulfurique ou l&rsquo;acide fluorhydrique. Il s&rsquo;agit d\u2019une unit\u00e9 d&rsquo;alkylation d&rsquo;acide sulfurique (SAAU) ou d&rsquo;une unit\u00e9 d&rsquo;alkylation fluorhydrique (HFAU).<\/p>\n<p>Cette r\u00e9action est effectu\u00e9e \u00e0 des temp\u00e9ratures douces dans une r\u00e9action biphasique. Il est important de conserver un rapport \u00e9lev\u00e9 d&rsquo;isobutane par rapport \u00e0 l\u2019alc\u00e8ne au point de r\u00e9action afin d&rsquo;\u00e9viter les r\u00e9actions secondaires qui produisent un produit \u00e0 indice d&rsquo;octane inf\u00e9rieur. Les phases se s\u00e9parant spontan\u00e9ment, il est important de m\u00e9langer vigoureusement la phase acide \u00e0 la phase hydrocarbon\u00e9e pour cr\u00e9er une surface de contact suffisante.<\/p>\n<p>Pour maintenir un pompage fiable et efficace, des syst\u00e8mes de support de joints avec d\u00e9tection de fuite sont n\u00e9cessaires pour tester les joints d&rsquo;\u00e9tanch\u00e9it\u00e9 internes des pompes process.<\/p>\n<p>Le produit de cette r\u00e9action, nomm\u00e9 alkylat, est compos\u00e9 d&rsquo;un m\u00e9lange d&rsquo;hydrocarbures \u00e0 cha\u00eenes ramifi\u00e9es d&rsquo;indice d&rsquo;octane \u00e9lev\u00e9. L&rsquo;alkylat est l&rsquo;un des principaux constituants des carburants car il poss\u00e8de des propri\u00e9t\u00e9s antid\u00e9tonantes exceptionnelles, et car sa combustion est propre. L&rsquo;indice d&rsquo;octane de l&rsquo;alkylat d\u00e9pend principalement de la nature des ol\u00e9fines utilis\u00e9es et des conditions op\u00e9ratoires.<\/p>\n<h2>Les exigences du client<\/h2>\n<p>Les syst\u00e8mes de support de joint sont utilis\u00e9s pour cr\u00e9er un environnement favorable autour du joint m\u00e9canique. La s\u00e9lection appropri\u00e9e d&rsquo;un syst\u00e8me de support de joint offrira des ann\u00e9es de service fiable et d&rsquo;\u00e9conomies sur les co\u00fbts d&rsquo;exploitation. Utilis\u00e9s pour d\u00e9tecter et surveiller les fuites du joint d&rsquo;\u00e9tanch\u00e9it\u00e9 interne, les syst\u00e8mes de support de joint d&rsquo;\u00e9tanch\u00e9it\u00e9 peuvent d\u00e9tecter les fuites de liquide (plans API 65 et 75) ou les fuites de gaz (plan API 76), ou un m\u00e9lange de fuite de gaz et de liquide (plan API 75). Un syst\u00e8me de collecte est utilis\u00e9 pour surveiller les performances du joint interne (niveau et pression).<\/p>\n<p>Dans un premier temps, le client souhaitait disposer pour cette application d\u2019un indicateur de niveau magn\u00e9tique avec transmetteur. Compte tenu de la nature du fluide (hydrocarbures l\u00e9gers + HF) la densit\u00e9 \u00e9tait non seulement trop faible pour concevoir un flotteur en Monel mais \u00e9galement tr\u00e8s variable. Par ailleurs la plage de mesure \u00e9tait r\u00e9duite (350 mm). Un niveau \u00e0 glace transparent a ainsi \u00e9t\u00e9 propos\u00e9 et install\u00e9 avec succ\u00e8s.<\/p>\n<h2>Challenges techniques<\/h2>\n<ul>\n<li>Masse volumique peu \u00e9lev\u00e9e (~ 430 kg\/m\u00b3) et variable<\/li>\n<li>R\u00e9sistante \u00e0 la corrosion chimique pour r\u00e9sister \u00e0 l\u2019acide fluorhydrique et sulfurique<\/li>\n<li>Usinage du Monel 400<\/li>\n<li>Petite plage de mesure (~ 350 mm)<\/li>\n<\/ul>\n<h2>Design unique de la solution WIKA<\/h2>\n<ul>\n<li>Solution sp\u00e9cifique avec chambre en Monel de diam\u00e8tre 3\u2019\u2019 et niveau \u00e0 glace transparent soud\u00e9 sur la chambre<\/li>\n<li>Connexion pr\u00e9vue sur le haut de la chambre pour l\u2019installation optionnelle d\u2019un radar filoguid\u00e9 par le client<\/li>\n<li>Savoir-faire en mati\u00e8re de soudage pour r\u00e9aliser un cordon de soudure continu sur tout le p\u00e9rim\u00e8tre du niveau \u00e0 glace<\/li>\n<li>Feuille de protection chimique du verre en polym\u00e8re haute performance KEL-F\u00ae (P-CTFE)<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dans un proc\u00e9d\u00e9 de raffinage du p\u00e9trole classique, l&rsquo;isobutane est combin\u00e9 avec des alc\u00e8nes de faible poids mol\u00e9culaire (principalement du propyl\u00e8ne et du butyl\u00e8ne) en pr\u00e9sence d&rsquo;un catalyseur acide fort, soit l&rsquo;acide sulfurique ou l&rsquo;acide fluorhydrique. Il s&rsquo;agit d\u2019une unit\u00e9 d&rsquo;alkylation d&rsquo;acide sulfurique (SAAU) ou d&rsquo;une unit\u00e9 d&rsquo;alkylation fluorhydrique (HFAU). Cette r\u00e9action est effectu\u00e9e \u00e0 [&hellip;]<\/p>\n","protected":false},"author":128,"featured_media":8027,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[232],"tags":[326],"class_list":["post-8298","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-applications","tag-alkylation"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Installation d\u2019une mesure de niveau sur un syst\u00e8me de support de joint pour l&#039;unit\u00e9 d&#039;alkylation du site Neste Oil Porvoo en Finlande - Blog WIKA<\/title>\n<meta name=\"description\" content=\"Dans un proc\u00e9d\u00e9 de raffinage du p\u00e9trole classique, l&#039;isobutane est combin\u00e9 avec des alc\u00e8nes de faible poids mol\u00e9culaire (principalement du propyl\u00e8ne et du\" \/>\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\/applications\/installation-dune-mesure-de-niveau-sur-un-systeme-de-support-de-joint-pour-unite-alkylation-du-site-neste-oil-porvoo-en-finlande\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Installation d\u2019une mesure de niveau sur un syst\u00e8me de support de joint pour l&#039;unit\u00e9 d&#039;alkylation du site Neste Oil Porvoo en Finlande - 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