{"id":4802,"date":"2026-02-05T07:39:18","date_gmt":"2026-02-05T07:39:18","guid":{"rendered":"https:\/\/www.pipetechservice.com\/?p=4802"},"modified":"2026-02-05T07:44:32","modified_gmt":"2026-02-05T07:44:32","slug":"what-are-the-main-technical-standards-governing-hot-tapping","status":"publish","type":"post","link":"https:\/\/www.pipetechservice.com\/fr\/what-are-the-main-technical-standards-governing-hot-tapping\/","title":{"rendered":"Quelles sont les principales normes techniques r\u00e9gissant le taraudage \u00e0 chaud ?"},"content":{"rendered":"<p>Les principales normes techniques r\u00e9gissant le taraudage \u00e0 chaud sont ASME PCC-2, API RP 2201 et une s\u00e9rie de codes compl\u00e9mentaires ASTM et sp\u00e9cifiques \u00e0 l'industrie, qui d\u00e9finissent collectivement les mat\u00e9riaux, les proc\u00e9dures, le soudage, l'inspection et les exigences de s\u00e9curit\u00e9 pour la r\u00e9alisation de raccordements sous pression \u00e0 des pipelines et des cuves sous tension. Ce guide complet d\u00e9taille ces normes essentielles et explique leur application dans des secteurs tels que le p\u00e9trole, l'eau et le gaz. Il couvre les \u00e9valuations techniques, la certification des \u00e9quipements, les qualifications des entrepreneurs et les protocoles de s\u00e9curit\u00e9 essentiels \u00e0 la conformit\u00e9 des projets de modification, d'entretien et de restauration des pipelines.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-the-primary-governing-standards-for-hot-tapping\">Les principales normes r\u00e9gissant le taraudage \u00e0 chaud<\/h2>\n\n\n\n<p>Le taraudage \u00e0 chaud est une proc\u00e9dure \u00e0 haut risque qui exige un respect strict des codes internationalement reconnus afin d'\u00e9viter une d\u00e9faillance catastrophique. Les normes fondamentales forment un cadre hi\u00e9rarchique, fournissant \u00e0 la fois des lignes directrices g\u00e9n\u00e9rales et des r\u00e8gles techniques sp\u00e9cifiques.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-asme-pcc-2-repair-of-pressure-equipment-and-piping\">ASME PCC-2 : R\u00e9paration des \u00e9quipements sous pression et des tuyauteries<\/h4>\n\n\n\n<p>La norme ASME PCC-2 est souvent consid\u00e9r\u00e9e comme la pierre angulaire du taraudage \u00e0 chaud en Am\u00e9rique du Nord. Elle d\u00e9finit les exigences fondamentales en mati\u00e8re d'ing\u00e9nierie et de proc\u00e9dures. La norme impose une analyse de faisabilit\u00e9 d\u00e9taill\u00e9e, sp\u00e9cifiant les contraintes admissibles, les plages de temp\u00e9rature et la compatibilit\u00e9 des mat\u00e9riaux. Elle fournit des lignes directrices explicites pour la conception des raccords de taraudage \u00e0 chaud, la qualification des proc\u00e9dures de soudage et l'examen non destructif n\u00e9cessaire apr\u00e8s l'ach\u00e8vement de la soudure. Une exigence cl\u00e9 est g\u00e9n\u00e9ralement le contr\u00f4le radiographique ou ultrasonique 100% de la soudure de fixation afin de garantir son int\u00e9grit\u00e9 avant la r\u00e9alisation du robinet.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-api-rp-2201-safe-hot-tapping-practices-in-the-petroleum-amp-petrochemical-industries\">API RP 2201 : Pratiques s\u00fbres de taraudage \u00e0 chaud dans les industries p\u00e9troli\u00e8res et p\u00e9trochimiques<\/h4>\n\n\n\n<p>Alors que l'ASME PCC-2 couvre le \u201ccomment\u201d, la pratique recommand\u00e9e 2201 de l'API se concentre intens\u00e9ment sur le \u201ccomment en toute s\u00e9curit\u00e9\u201d dans le cadre d'un service d'hydrocarbures. Cette norme est indispensable pour tous les services de taraudage \u00e0 chaud sur les ol\u00e9oducs, les raffineries ou les pipelines p\u00e9trochimiques. Elle met l'accent sur l'examen des risques, la combustibilit\u00e9 du contenu des pipelines et le contr\u00f4le des sources d'inflammation. L'API RP 2201 \u00e9tablit des listes de contr\u00f4le strictes avant travaux, des exigences en mati\u00e8re de formation du personnel et des plans d'intervention en cas d'urgence. Pour tout entrepreneur travaillant sur des conduites d'hydrocarbures sous tension, le respect de cette norme n'est pas n\u00e9gociable, tant du point de vue de la s\u00e9curit\u00e9 que de la conformit\u00e9.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-astm-standards-for-material-and-procedure-qualification\">Normes ASTM pour la qualification des mat\u00e9riaux et des proc\u00e9dures<\/h4>\n\n\n\n<p>Les normes d'ex\u00e9cution s'appuient sur diverses sp\u00e9cifications ASTM qui garantissent la qualit\u00e9 et les performances des mat\u00e9riaux. Par exemple, les propri\u00e9t\u00e9s m\u00e9caniques du raccord de robinetterie et du robinet de d\u00e9rivation doivent \u00eatre conformes aux grades de mat\u00e9riaux ASTM tels que A105 ou A106. La qualification de la proc\u00e9dure de soudage elle-m\u00eame fait souvent r\u00e9f\u00e9rence aux normes ASTM pour le test des coupons de soudure. En outre, l'outil de coupe utilis\u00e9 dans la machine \u00e0 tarauder doit \u00eatre fabriqu\u00e9 \u00e0 partir d'un acier \u00e0 outils r\u00e9pondant \u00e0 des crit\u00e8res stricts de duret\u00e9 et de durabilit\u00e9 afin de garantir une coupe nette et d'\u00e9viter la cr\u00e9ation de copeaux m\u00e9talliques dangereux au cours de l'op\u00e9ration.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-essential-components-of-a-compliant-hot-tap-procedure\">\u00c9l\u00e9ments essentiels d'une proc\u00e9dure de robinetterie \u00e0 chaud conforme<\/h2>\n\n\n\n<p>Le respect des normes se traduit par un processus m\u00e9ticuleux et document\u00e9. Chaque phase, de la planification initiale \u00e0 l'inspection finale, est r\u00e9gie par des clauses sp\u00e9cifiques des codes primaires.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-engineering-assessment-and-feasibility-study\">\u00c9valuation technique et \u00e9tude de faisabilit\u00e9<\/h4>\n\n\n\n<p>Aucun piquage \u00e0 chaud ne doit \u00eatre effectu\u00e9 sans une \u00e9valuation technique formelle. Cette \u00e9tude, exig\u00e9e par l'ASME PCC-2, \u00e9value si la paroi du pipeline ou de la cuve a une \u00e9paisseur suffisante pour r\u00e9sister \u00e0 la contrainte suppl\u00e9mentaire du soudage et du taraudage. Elle calcule la pression de service maximale admissible pendant l'op\u00e9ration et v\u00e9rifie que le raccord s\u00e9lectionn\u00e9 est adapt\u00e9 aux conditions de service, notamment \u00e0 la temp\u00e9rature et \u00e0 la composition du fluide. Notre exp\u00e9rience montre qu'une \u00e9tude de faisabilit\u00e9 solide est le moyen le plus efficace d'att\u00e9nuer le risque de d\u00e9faillance d'un pipeline lors d'une modification.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-welding-and-non-destructive-examination-nde-requirements\">Exigences en mati\u00e8re de soudage et de contr\u00f4le non destructif (CND)<\/h4>\n\n\n\n<p>L'int\u00e9grit\u00e9 du robinet \u00e0 chaud d\u00e9pend de la qualit\u00e9 de la soudure reliant le raccord \u00e0 la conduite principale. Les normes exigent que les soudeurs soient qualifi\u00e9s sp\u00e9cifiquement pour les techniques de \u201csoudage en service\u201d, qui tiennent compte de la dissipation rapide de la chaleur caus\u00e9e par l'\u00e9coulement du produit. Une sp\u00e9cification \u00e9crite de la proc\u00e9dure de soudage doit \u00eatre suivie \u00e0 la lettre. Une fois le soudage termin\u00e9, le contr\u00f4le non destructif 100% - tel que la radiographie ou l'ultrason \u00e0 r\u00e9seau phas\u00e9 - est obligatoire dans la plupart des cas pour v\u00e9rifier que la soudure est exempte de fissures, d'absence de fusion ou d'autres d\u00e9fauts critiques.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-equipment-certification-fittings-machines-and-cutters\">Certification des \u00e9quipements : Raccords, machines et coupeurs<\/h4>\n\n\n\n<p>Tous les \u00e9quipements doivent faire l'objet d'une certification appropri\u00e9e. Le raccord de robinetterie chaude et la vanne d'isolement n\u00e9cessitent g\u00e9n\u00e9ralement un formulaire de rapport de donn\u00e9es du fabricant certifiant la conformit\u00e9 \u00e0 des normes telles que la norme ASME B16.11. <a href=\"https:\/\/www.pipetechservice.com\/fr\/product-category\/pipeline-hot-tapping-machine\/\">La machine \u00e0 tarauder elle-m\u00eame<\/a>, Qu'il s'agisse d'une petite conduite d'eau ou d'un ol\u00e9oduc de grand diam\u00e8tre, l'\u00e9quipement doit avoir une pression nominale document\u00e9e qui d\u00e9passe la pression de la conduite d'exploitation. Lors de nos essais en usine, nous testons la pression de tous les \u00e9quipements critiques \u00e0 1,5 fois leur capacit\u00e9 nominale avant d'approuver leur utilisation sur un chantier de construction, ce qui garantit une marge de s\u00e9curit\u00e9 \u00e0 l'entrepreneur.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-industry-specific-standards-and-best-practices\">Normes et meilleures pratiques sp\u00e9cifiques \u00e0 l'industrie<\/h2>\n\n\n\n<p>Au-del\u00e0 des normes de base, des secteurs sp\u00e9cifiques ont des codes suppl\u00e9mentaires qui doivent \u00eatre int\u00e9gr\u00e9s dans le plan de pr\u00e9l\u00e8vement \u00e0 chaud, refl\u00e9tant les risques uniques des diff\u00e9rents contenus des pipelines.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-oil-amp-gas-pipeline-standards-asme-b31-4-b31-8-api-1104\">Normes relatives aux ol\u00e9oducs et gazoducs (ASME B31.4\/B31.8, API 1104)<\/h4>\n\n\n\n<p>Pour les pipelines de transport, les codes de construction et d'exploitation ASME B31.4 (liquides) et B31.8 (gaz) sont applicables. Tout robinet \u00e0 chaud constitue une \u201cmodification\u201d au sens de ces codes, ce qui entra\u00eene des r\u00e8gles sp\u00e9cifiques en mati\u00e8re de notification et de documentation. Le soudage sur ces pipelines doit \u00e9galement \u00eatre conforme \u00e0 l'API 1104, \u201cWelding of Pipelines and Related Facilities\u201d (soudage des pipelines et des installations connexes). La combinaison des normes B31.8, API RP 2201 et API 1104 constitue la mosa\u00efque r\u00e9glementaire compl\u00e8te pour un branchement \u00e0 chaud sur une canalisation de gaz naturel, couvrant tous les aspects, de la tra\u00e7abilit\u00e9 des mat\u00e9riaux au profil des cordons de soudure.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-water-and-wastewater-standards-awwa-c200-c900-series\">Normes relatives \u00e0 l'eau et aux eaux us\u00e9es (s\u00e9rie AWWA C200-C900)<\/h4>\n\n\n\n<p>Le piquage \u00e0 chaud sur les conduites d'eau est r\u00e9gi par les normes de l'American Water Works Association. Les normes applicables aux mat\u00e9riaux dictent les mat\u00e9riaux acceptables pour les raccords et exigent des consid\u00e9rations sp\u00e9cifiques pour la d\u00e9sinfection et la pr\u00e9vention de la contamination. Bien que les risques diff\u00e8rent de ceux des services d'hydrocarbures, le potentiel de lib\u00e9ration de pression catastrophique et d'interruption de service reste \u00e9lev\u00e9, ce qui rend le respect de ces normes sp\u00e9cialis\u00e9es essentiel pour les projets municipaux d'entretien des r\u00e9seaux d'eau et d'eaux us\u00e9es.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-special-considerations-for-air-gas-and-chemical-lines\">Consid\u00e9rations particuli\u00e8res pour les conduites d'air, de gaz et de produits chimiques<\/h4>\n\n\n\n<p>Les conduites d'air et de produits chimiques industriels n\u00e9cessitent un examen approfondi des propri\u00e9t\u00e9s du fluide. Pour les conduites d'oxyg\u00e8ne, une propret\u00e9 exceptionnelle pour \u00e9viter la combustion est primordiale et n\u00e9cessite souvent des proc\u00e9dures allant au-del\u00e0 des codes standards. Pour les produits chimiques corrosifs, la compatibilit\u00e9 du mat\u00e9riau du raccord de robinetterie avec le fluide de traitement est un \u00e9l\u00e9ment essentiel de l'\u00e9tude de faisabilit\u00e9, qui n\u00e9cessite souvent des alliages sp\u00e9ciaux tels que l'acier inoxydable ou l'Inconel. Ces sc\u00e9narios exigent que les proc\u00e9dures standard de l'ASME PCC-2 soient compl\u00e9t\u00e9es par une analyse rigoureuse des risques li\u00e9s aux proc\u00e9d\u00e9s, sp\u00e9cifique au site.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-implementing-standards-from-planning-to-execution\">Mise en \u0153uvre des normes : De la planification \u00e0 l'ex\u00e9cution<\/h2>\n\n\n\n<p>La r\u00e9ussite du taraudage \u00e0 chaud est le fruit d'une collaboration entre le propri\u00e9taire de l'ouvrage, le bureau d'\u00e9tudes, le fournisseur de mat\u00e9riaux et l'entrepreneur sur le terrain. Chaque partie a des responsabilit\u00e9s d\u00e9finies dans le cadre des normes applicables.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-the-role-of-the-contractor-and-material-supplier\">Le r\u00f4le de l'entrepreneur et du fournisseur de mat\u00e9riaux<\/h4>\n\n\n\n<p>Un entrepreneur qualifi\u00e9 en taraudage \u00e0 chaud est l'agent d'ex\u00e9cution de la proc\u00e9dure technique. Ses responsabilit\u00e9s comprennent la mise \u00e0 disposition de personnel certifi\u00e9 (soudeurs, techniciens), d'\u00e9quipements approuv\u00e9s (machines \u00e0 tarauder, \u00e9quipements d'obturation de pipelines), et le respect des pratiques de travail s\u00fbres de l'API RP 2201. Le fournisseur de mat\u00e9riaux ou le fabricant d'\u00e9quipements doit fournir une certification enti\u00e8rement tra\u00e7able pour tous les composants, depuis le raccord de robinet de pipeline jusqu'aux joints d'un bouchon de pipeline temporaire. Cette cha\u00eene de contr\u00f4le est essentielle pour les pistes d'audit et l'assurance qualit\u00e9.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-safety-protocols-and-risk-mitigation\">Protocoles de s\u00e9curit\u00e9 et att\u00e9nuation des risques<\/h4>\n\n\n\n<p>La s\u00e9curit\u00e9 est le fil conducteur de toutes les normes. Les protocoles cl\u00e9s qui doivent \u00eatre int\u00e9gr\u00e9s dans chaque plan de travail sont les suivants :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>V\u00e9rification du fluide de ligne :<\/strong>\u00a0Confirmation du contenu, de la pression et de la temp\u00e9rature imm\u00e9diatement avant le d\u00e9but des travaux.<\/li>\n\n\n\n<li><strong>Mesures d'urgence en cas de d\u00e9faillance de l'isolement :<\/strong>\u00a0Disposer d'un plan d'isolement de secours v\u00e9rifi\u00e9 si un <a href=\"https:\/\/www.pipetechservice.com\/fr\/product-category\/pipeline-plugging-fittings\/\">bouchon de canalisation<\/a> ou le bouchon est utilis\u00e9 comme barri\u00e8re principale.<\/li>\n\n\n\n<li><strong>Vitesse de coupe contr\u00f4l\u00e9e :<\/strong>\u00a0Gestion de la chaleur et de la formation de copeaux pendant la coupe pour \u00e9viter l'inflammation (en service hydrocarbures) ou l'endommagement de l'outil.<br>Nous r\u00e9pondons souvent \u00e0 la question suivante :\u00a0<em>Quel est le risque le plus important en mati\u00e8re de conformit\u00e9 ?<\/em>\u00a0D'apr\u00e8s les r\u00e9sultats des audits, il s'agit souvent d'une documentation incompl\u00e8te - les sp\u00e9cifications de la proc\u00e9dure de soudage, les rapports d'essais non destructifs et les certificats de mat\u00e9riaux n'\u00e9tant pas disponibles pour v\u00e9rification.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-documentation-and-quality-assurance-records\">Documentation et dossiers d'assurance qualit\u00e9<\/h4>\n\n\n\n<p>La derni\u00e8re \u00e9tape critique est la compilation du dossier d'assurance qualit\u00e9. Ce dossier prouve la conformit\u00e9 et est essentiel pour la gestion future de l'int\u00e9grit\u00e9 des pipelines. Il doit syst\u00e9matiquement inclure l'\u00e9tude de faisabilit\u00e9 initiale, tous les certificats de mat\u00e9riel et d'\u00e9quipement, les sp\u00e9cifications sign\u00e9es des proc\u00e9dures de soudage et les qualifications des soudeurs, les rapports d'essais non destructifs et les registres de terrain sign\u00e9s. Ce dossier complet transforme le travail physique en un processus d\u00e9fendable et reproductible, ce qui est une valeur fondamentale des services professionnels de maintenance et de restauration des pipelines.<\/p>\n\n\n\n<p>La compr\u00e9hension et la mise en \u0153uvre des principales normes techniques r\u00e9gissant le taraudage \u00e0 chaud -ASME PCC-2, API RP 2201 et les codes industriels connexes- sont fondamentales pour une modification s\u00fbre et r\u00e9ussie des pipelines. Ces normes fournissent un cadre solide pour l'\u00e9valuation de la faisabilit\u00e9, la certification des mat\u00e9riaux, l'ex\u00e9cution d'un soudage pr\u00e9cis et l'application d'une s\u00e9curit\u00e9 rigoureuse du d\u00e9but \u00e0 la fin. Qu'il s'agisse d'un simple raccordement de conduite d'eau ou d'une op\u00e9ration complexe d'obturation d'un pipeline d'hydrocarbures, le respect de ces normes att\u00e9nue les risques et garantit l'int\u00e9grit\u00e9 \u00e0 long terme du syst\u00e8me sous pression. Pour les propri\u00e9taires d'actifs et les entrepreneurs, la ma\u00eetrise de ces normes de taraudage \u00e0 chaud est la base d'un travail responsable et fiable. <a href=\"https:\/\/www.pipetechservice.com\/fr\/\">services de construction, d'entretien et de restauration de pipelines<\/a>.<\/p>\n\n\n\n<p><strong>Auteur :<\/strong>&nbsp;JSW Pipeline Solutions, \u00e9quipe d'ing\u00e9nieurs principaux<br><strong>Mise \u00e0 jour :<\/strong>&nbsp;23 mai 2024<\/p>","protected":false},"excerpt":{"rendered":"<p>The main technical standards governing hot tapping are ASME PCC-2, API RP 2201, and a suite of complementary ASTM and industry-specific codes, which collectively define the materials, procedures, welding, inspection, and safety requirements for making pressurized connections to live pipelines and vessels. This comprehensive guide details these critical standards, explaining their application across industries like [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4805,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_surecart_dashboard_logo_width":"180px","_surecart_dashboard_show_logo":true,"_surecart_dashboard_navigation_orders":true,"_surecart_dashboard_navigation_invoices":true,"_surecart_dashboard_navigation_subscriptions":true,"_surecart_dashboard_navigation_downloads":true,"_surecart_dashboard_navigation_billing":true,"_surecart_dashboard_navigation_account":true,"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[340],"tags":[437,471,470,469,472],"class_list":["post-4802","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-api-rp-2201","tag-asme-pcc-2","tag-hot-tap-procedure","tag-hot-tapping-standards","tag-pipeline-modification-standards"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.5 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Hot Tapping Standards: A Complete Guide to ASME, API &amp; Safety Codes<\/title>\n<meta name=\"description\" content=\"What are the main technical standards governing hot tapping? 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