{"id":5789,"date":"2026-05-27T03:22:41","date_gmt":"2026-05-27T03:22:41","guid":{"rendered":"https:\/\/www.pipetechservice.com\/?p=5789"},"modified":"2026-06-13T12:33:39","modified_gmt":"2026-06-13T12:33:39","slug":"hot-tapping-on-sour-gas-pipelines-nace-mr0175-material-selection-hardness-control-and-ssc-prevention","status":"publish","type":"post","link":"https:\/\/www.pipetechservice.com\/fr\/hot-tapping-on-sour-gas-pipelines-nace-mr0175-material-selection-hardness-control-and-ssc-prevention\/","title":{"rendered":"Raccordement \u00e0 chaud sur les gazoducs transportant du gaz acide : NACE MR0175 \u2013 Choix des mat\u00e9riaux, contr\u00f4le de la duret\u00e9 et pr\u00e9vention de la corrosion sous contrainte"},"content":{"rendered":"<h3 class=\"wp-block-heading\" id=\"h-how-to-prevent-sulfide-stress-cracking-ssc-in-split-tees-valves-and-welds-under-high-h\u2082s-conditions\">Comment pr\u00e9venir la fissuration sous contrainte due au sulfure (SSC) dans les t\u00e9s fendus, les vannes et les soudures dans des conditions de forte concentration en H\u2082S<\/h3>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-nace-requirements-for-sour-gas-hot-tapping\">Exigences de la NACE relatives au per\u00e7age \u00e0 chaud sur des conduites de gaz acide<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Duret\u00e9 maximale : 22 HRC (250 HV10) pour les aciers au carbone et faiblement alli\u00e9s<\/li>\n\n\n\n<li>Tous les composants en contact avec le fluide doivent \u00eatre conformes \u00e0 la norme NACE MR0175\/ISO 15156<\/li>\n\n\n\n<li>La zone affect\u00e9e thermiquement (ZAT) est l'endroit o\u00f9 le risque de fissuration sous contrainte (SSC) est le plus \u00e9lev\u00e9<\/li>\n\n\n\n<li>Un traitement thermique post-soudage (PWHT) est requis si la duret\u00e9 du m\u00e9tal de base d\u00e9passe 20 HRC ou si l'\u00e9paisseur de la paroi d\u00e9passe 19 mm<\/li>\n\n\n\n<li>Utiliser un proc\u00e9d\u00e9 de soudage \u00e0 faible teneur en hydrog\u00e8ne (GTAW + E7018-H4R) avec un apport de chaleur compris entre 1,5 et 2,5 kJ\/mm<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-introduction-what-this-guide-covers\">Introduction : ce que couvre ce guide<\/h2>\n\n\n\n<p>La r\u00e9alisation de raccordements \u00e0 chaud sur des gazoducs transportant du gaz acide n\u00e9cessite le respect strict des normes NACE MR0175\/ISO 15156. Ce guide fournit des sp\u00e9cifications pour le choix des mat\u00e9riaux, des strat\u00e9gies de contr\u00f4le de la duret\u00e9 avec des limites v\u00e9rifi\u00e9es, des m\u00e9thodes de pr\u00e9vention de la corrosion sous contrainte (SSC) pour la zone affect\u00e9e (HAZ) et le m\u00e9tal d'apport, une qualification \u00e9tape par \u00e9tape des proc\u00e9dures de soudage, des exigences d'inspection, ainsi que des \u00e9tudes de cas de d\u00e9faillances sur le terrain issues d'op\u00e9rations sur des gaz acides au Moyen-Orient.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-1-recommended-materials-for-sour-gas-hot-tapping\">1. Mat\u00e9riaux recommand\u00e9s pour le per\u00e7age \u00e0 chaud de conduites de gaz acide<\/h2>\n\n\n\n<p>Ces donn\u00e9es s'appuient sur des relev\u00e9s de terrain effectu\u00e9s sur plus de 200 interventions de raccordement \u00e0 chaud sur des conduites de gaz acide au Qatar, en Arabie saoudite et aux \u00c9mirats arabes unis.<\/p>\n\n\n\n<p><strong>T\u00e9 diviseur (raccord de d\u00e9rivation)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mat\u00e9riau : A350 LF2 Classe 1 (normalis\u00e9 et revenu)<\/li>\n\n\n\n<li>Duret\u00e9 : 18-20 HRC \u00e0 la livraison<\/li>\n\n\n\n<li>Traitement thermique post-soudage : n'est g\u00e9n\u00e9ralement pas requis pour cette nuance<\/li>\n<\/ul>\n\n\n\n<p><strong>Corps de vanne (vanne \u00e0 guillotine ou \u00e0 bille \u00e0 passage int\u00e9gral)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mat\u00e9riau : A350 LF2 ou A216 WCB, certifi\u00e9 NACE MR0175<\/li>\n\n\n\n<li>Duret\u00e9 : 22 HRC maximum<\/li>\n\n\n\n<li>Norme : API 6D avec \u00e9quipement NACE<\/li>\n<\/ul>\n\n\n\n<p><strong>Composants de la vanne (tige, si\u00e8ge, surfaces d'\u00e9tanch\u00e9it\u00e9)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mat\u00e9riau : acier inoxydable 316 et tige en Monel K500<\/li>\n\n\n\n<li>Duret\u00e9 : 22 HRC maximum pour l'acier inoxydable<\/li>\n\n\n\n<li>Restriction : \u00e9viter le rev\u00eatement dur en Stellite en pr\u00e9sence de gaz acide<\/li>\n<\/ul>\n\n\n\n<p><strong>Consommables de soudage (passe de fond)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Proc\u00e9d\u00e9 : GTAW<\/li>\n\n\n\n<li>M\u00e9tal d'apport : ER70S-6<\/li>\n\n\n\n<li>Exigence : faible teneur en hydrog\u00e8ne<\/li>\n<\/ul>\n\n\n\n<p><strong>Consommables de soudage (passes de remplissage et de recouvrement)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Proc\u00e9d\u00e9 : SMAW<\/li>\n\n\n\n<li>Remplissage : E7018-H4R<\/li>\n\n\n\n<li>Exigence : teneur en hydrog\u00e8ne extr\u00eamement faible (d\u00e9signation H4R)<\/li>\n<\/ul>\n\n\n\n<p><strong>Environnement \u00e0 forte teneur en chlorure et en H\u2082S (en mer ou en zone c\u00f4ti\u00e8re)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>T\u00e9 diviseur : Duplex 2205 (recuit de mise en solution)<\/li>\n\n\n\n<li>Vanne : corps en Duplex 2205 avec tige en super duplex<\/li>\n\n\n\n<li>Limite de duret\u00e9 : 28 HRC maximum selon la norme NACE MR0175<\/li>\n\n\n\n<li>Traitement thermique post-fabrication : non requis<\/li>\n<\/ul>\n\n\n\n<p><strong>Service en milieu extr\u00eamement acide (H\u2082S sup\u00e9rieur \u00e0 20% ou pr\u00e9sence de soufre \u00e9l\u00e9mentaire)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>T\u00e9 fendu : alliage 625 ou alliage 825 (monobloc ou rev\u00eatement par soudure)<\/li>\n\n\n\n<li>Vanne : corps et garnitures en alliage 625<\/li>\n\n\n\n<li>Limite de duret\u00e9 : aucune restriction NACE (r\u00e9sistance inh\u00e9rente \u00e0 la corrosion sous contrainte)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-2-material-selection-decision-guide-by-sour-severity\">2. Guide d'aide \u00e0 la s\u00e9lection des mat\u00e9riaux en fonction de la gravit\u00e9 de la corrosion<\/h2>\n\n\n\n<p><strong>Pression partielle de H\u2082S inf\u00e9rieure \u00e0 0,05 psi (service sans soufre)<\/strong><br>\u2192 Acier au carbone standard. Non soumis aux exigences de la norme NACE MR0175.<\/p>\n\n\n\n<p><strong>Pression partielle de H\u2082S comprise entre 0,05 et 1,0 psi (gaz acide de niveau 1)<\/strong><br>\u2192 Acier au carbone conforme \u00e0 la norme NACE MR0175. Duret\u00e9 maximale de 22 HRC. Recommand\u00e9 : A350 LF2 Classe 1.<\/p>\n\n\n\n<p><strong>Pression partielle de H\u2082S comprise entre 1,0 et 201 TP3T (gaz acide de niveau 2)<\/strong><br>\u2192 LTCS (A350 LF2) ou acier inoxydable 316L. Un traitement thermique post-fabrication (PWHT) est requis pour l'acier au carbone lorsque l'\u00e9paisseur de paroi d\u00e9passe 19 mm.<\/p>\n\n\n\n<p><strong>Pr\u00e9sence de H\u2082S sup\u00e9rieure \u00e0 20% ou de soufre \u00e9l\u00e9mentaire (gaz acide de niveau 3)<\/strong><br>\u2192 Alliages de nickel (Alliage 625 ou Alliage 825). Aucun probl\u00e8me de duret\u00e9.<\/p>\n\n\n\n<p><strong>Teneur \u00e9lev\u00e9e en chlorures, quelle que soit la concentration en H\u2082S<\/strong><br>\u2192 Duplex 2205 obligatoire. Le 316L pr\u00e9sente un risque de corrosion par piq\u00fbres.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-3-faq-sour-gas-hot-tapping\">3. FAQ : Per\u00e7age \u00e0 chaud sur gaz acide<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-q-what-is-the-maximum-hardness-allowed-for-sour-service-welds-under-nace-mr0175\">Q : Quelle est la duret\u00e9 maximale autoris\u00e9e pour les soudures en milieu acide selon la norme NACE MR0175 ?<\/h3>\n\n\n\n<p><strong>R : La duret\u00e9 maximale est de 22 HRC (250 HV10) pour les aciers au carbone et faiblement alli\u00e9s utilis\u00e9s dans des applications avec gaz acide.<\/strong><\/p>\n\n\n\n<p>Cette limite s'applique au m\u00e9tal d'apport, \u00e0 la zone affect\u00e9e thermiquement (ZAT) et au m\u00e9tal de base dans un rayon de 1 mm autour de la ligne de fusion. Une duret\u00e9 sup\u00e9rieure \u00e0 22 HRC entra\u00eene un risque de fissuration sous contrainte due aux sulfures. L'alliage 625 n'a pas de limite de duret\u00e9 NACE. Le Duplex 2205 autorise jusqu'\u00e0 28 HRC.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-q-can-i-hot-tap-a-sour-gas-pipeline-without-post-weld-heat-treatment\">Q : Puis-je r\u00e9aliser un raccordement \u00e0 chaud sur un gazoduc transportant du gaz acide sans traitement thermique apr\u00e8s soudage ?<\/h3>\n\n\n\n<p><strong>R : Oui, si l'\u00e9quivalent carbone est inf\u00e9rieur \u00e0 0,43, si le pr\u00e9chauffage atteint au moins 150 \u00b0C et si l'\u00e9paisseur de la paroi est inf\u00e9rieure \u00e0 19 mm.<\/strong><\/p>\n\n\n\n<p>Les donn\u00e9es de terrain recueillies aupr\u00e8s d'op\u00e9rateurs du secteur du gaz acide au Moyen-Orient montrent qu'un apport de chaleur contr\u00f4l\u00e9 \u00e9gal ou inf\u00e9rieur \u00e0 2,0 kJ\/mm, associ\u00e9 \u00e0 un pr\u00e9chauffage minimal de 150 \u00b0C, permet d'obtenir une duret\u00e9 de la zone affect\u00e9e thermiquement (HAZ) inf\u00e9rieure \u00e0 22 HRC sur l'acier 85% utilis\u00e9 pour les raccords de 12 pouces et moins.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-q-what-valve-material-is-required-upstream-of-a-sour-gas-hot-tap\">Q : Quel mat\u00e9riau doit-on utiliser pour la vanne install\u00e9e en amont d'un raccordement \u00e0 chaud sur un gaz acide ?<\/h3>\n\n\n\n<p><strong>R : Une vanne \u00e0 guillotine ou \u00e0 bille \u00e0 passage int\u00e9gral certifi\u00e9e NACE MR0175\/ISO 15156, dont la duret\u00e9 du corps est inf\u00e9rieure ou \u00e9gale \u00e0 22 HRC et dont les composants internes sont en acier inoxydable 316 ou en Monel K500.<\/strong><\/p>\n\n\n\n<p>Les vannes API 6D standard sans certification NACE ne sont pas acceptables. Les si\u00e8ges \u00e0 rev\u00eatement dur contenant du Stellite pr\u00e9sentent des risques de corrosion galvanique dans les environnements \u00e0 \u00e9lectrolyte acide.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-q-how-do-i-prevent-ssc-in-the-weld-haz-during-hot-tapping\">Q : Comment \u00e9viter la formation de SSC dans la zone affect\u00e9e par la soudure lors d'un per\u00e7age \u00e0 chaud ?<\/h3>\n\n\n\n<p><strong>R : Contr\u00f4ler la temp\u00e9rature de pr\u00e9chauffage (120-150 \u00b0C), l'apport de chaleur (1,5-2,5 kJ\/mm au maximum) et la temp\u00e9rature entre les passes (inf\u00e9rieure \u00e0 250 \u00b0C).<\/strong><\/p>\n\n\n\n<p>La zone affect\u00e9e thermiquement (HAZ) pr\u00e9sente le risque le plus \u00e9lev\u00e9 de fissuration par sensibilit\u00e9 \u00e0 la sulfatation (SSC), car le refroidissement rapide entra\u00eene la formation de martensite. Le soudage \u00e0 faible teneur en hydrog\u00e8ne (E7018-H4R) et le traitement thermique post-soudage (PWHT) \u00e0 620-660 \u00b0C r\u00e9duisent les contraintes r\u00e9siduelles. Les essais de duret\u00e9 sur site doivent inclure des mesures dans la zone affect\u00e9e (HAZ) \u00e0 1 mm, 2 mm et 5 mm de la ligne de fusion.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-q-does-the-split-tee-material-need-to-match-the-run-pipe\">Q : Le mat\u00e9riau du t\u00e9 diviseur doit-il \u00eatre le m\u00eame que celui du tuyau de refoulement ?<\/h3>\n\n\n\n<p><strong>R : Non, mais les deux mat\u00e9riaux doivent, chacun de leur c\u00f4t\u00e9, satisfaire aux exigences de la norme NACE MR0175 relatives aux environnements acides et \u00eatre compatibles au soudage.<\/strong><\/p>\n\n\n\n<p>Le soudage d'un t\u00e9 fendu A350 LF2 (18-20 HRC) \u00e0 un tuyau de conduite A106 Gr B (20-22 HRC apr\u00e8s normalisation) est acceptable si le mode op\u00e9ratoire de soudage est valid\u00e9 sur le mat\u00e9riau pr\u00e9sentant la duret\u00e9 la plus \u00e9lev\u00e9e.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-q-how-is-hic-different-from-ssc-and-which-matters-for-hot-taps\">Q : En quoi le HIC diff\u00e8re-t-il du SSC, et quelle est la diff\u00e9rence pour les raccordements \u00e0 chaud ?<\/h3>\n\n\n\n<p><strong>R : La corrosion sous contrainte (SSC) est le principal probl\u00e8me \u00e0 prendre en compte lors des raccordements \u00e0 chaud, car le soudage g\u00e9n\u00e8re des contraintes de traction r\u00e9siduelles. La corrosion sous contrainte (HIC) n'est un facteur \u00e0 prendre en compte que pour les conduites fortement corrod\u00e9es.<\/strong><\/p>\n\n\n\n<p>La fissuration induite par l'hydrog\u00e8ne (HIC) se produit dans le m\u00e9tal de base \u00e0 la suite de la formation de cloques dues \u00e0 l'hydrog\u00e8ne. La fissuration sous contrainte due aux sulfures (SSC) est provoqu\u00e9e par les contraintes de traction et le H\u2082S. Un contr\u00f4le par ultrasons avant le per\u00e7age \u00e0 chaud permet de d\u00e9tecter les indicateurs de HIC lorsque l'\u00e2ge de la conduite d\u00e9passe 15 ans.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-4-step-by-step-weld-procedure-qualification-for-nace-mr0175-hot-taps\">4. Qualification \u00e9tape par \u00e9tape de la proc\u00e9dure de soudage pour les raccordements \u00e0 chaud selon la norme NACE MR0175<\/h2>\n\n\n\n<p>En l'absence d'une sp\u00e9cification de proc\u00e9dure de soudage (WPS) et d'un dossier de qualification de proc\u00e9dure (PQR) valides incluant des essais SSC, l'installation n'est pas conforme \u00e0 la r\u00e9glementation.<\/p>\n\n\n\n<p><strong>\u00c9tape 1 \u2013 D\u00e9terminer le niveau d'acidit\u00e9<\/strong><br>Veuillez vous reporter au guide de d\u00e9cision de la section 2.<\/p>\n\n\n\n<p><strong>\u00c9tape 2 \u2013 S\u00e9lectionner les \u00e9chantillons d'essai<\/strong><br>Faire correspondre le mat\u00e9riau et l'\u00e9paisseur sur le terrain. Inclure la g\u00e9om\u00e9trie simul\u00e9e du per\u00e7age \u00e0 chaud.<\/p>\n\n\n\n<p><strong>\u00c9tape 3 \u2013 Effectuer le soudage en respectant les param\u00e8tres consign\u00e9s<\/strong><br>Enregistrez l'intensit\u00e9, la tension, la vitesse de d\u00e9placement et la temp\u00e9rature entre les passes pour chaque passe.<\/p>\n\n\n\n<p><strong>\u00c9tape 4 \u2013 R\u00e9aliser un essai selon la m\u00e9thode A de la norme NACE TM0177<\/strong><br>720 heures dans la solution NACE A \u00e0 une contrainte de traction de 801 TP3T SMYS. Pas de fissuration = test r\u00e9ussi.<\/p>\n\n\n\n<p><strong>\u00c9tape 5 \u2013 Effectuer des balayages de duret\u00e9 conform\u00e9ment \u00e0 la norme ISO 15156-2, annexe B<\/strong><br>Effectuer des essais sur l'axe de la soudure, dans la zone affect\u00e9e par la chaleur (HAZ) \u00e0 1, 2 et 5 mm, ainsi que sur le m\u00e9tal de base. Valeur maximale : 250 HV10.<\/p>\n\n\n\n<p><strong>Donn\u00e9es de laboratoire issues de plus de 40 certifications PQR :<\/strong>&nbsp;Le 12% a \u00e9chou\u00e9 aux essais de duret\u00e9 initiaux en raison d'une dur\u00e9e de maintien insuffisante lors du traitement thermique post-soudage (PWHT). L'allongement de la dur\u00e9e du PWHT de 1 heure \u00e0 1 heure et demie par 25 mm d'\u00e9paisseur de paroi a permis de rem\u00e9dier \u00e0 tous les d\u00e9fauts.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-5-common-failure-causes-in-sour-gas-hot-taps\">5. Causes courantes de d\u00e9faillance dans les prises de gaz acide \u00e0 chaud<\/h2>\n\n\n\n<p>Ces conclusions s'appuient sur 12 enqu\u00eates sur des d\u00e9faillances sur site et plus de 200 installations de raccordement \u00e0 chaud dans le cadre d'exploitations de gaz acide au Moyen-Orient.<\/p>\n\n\n\n<p><strong>Duret\u00e9 HAZ sup\u00e9rieure \u00e0 24 HRC (801 cas de d\u00e9faillance du SSC)<\/strong><br>Cause principale : p\u00e9n\u00e9tration insuffisante lors du pr\u00e9chauffage. Sur un chantier \u00e0 Oman, une couche de martensite s\u2019est form\u00e9e au niveau de la passe de racine, car le temps de maintien lors du pr\u00e9chauffage \u00e9tait de 15 minutes au lieu de 45 minutes.<\/p>\n\n\n\n<p><strong>Mat\u00e9riaux inappropri\u00e9s pour les \u00e9l\u00e9ments internes de la vanne<\/strong><br>Des vannes API 6D standard sans certification NACE sont couramment install\u00e9es. Des composants internes non conformes cr\u00e9ent des points de d\u00e9part de la corrosion sous contrainte (SSC) dans un d\u00e9lai de 6 \u00e0 18 mois.<\/p>\n\n\n\n<p><strong>Pr\u00e9chauffage insuffisant lors de la passe de racine<\/strong><br>Les contraintes r\u00e9siduelles mesur\u00e9es sur les d\u00e9rivations \u00e0 chaud de petit diam\u00e8tre d\u00e9passent la limite d'\u00e9lasticit\u00e9 de l'acier 80% en raison d'un refroidissement rapide.<\/p>\n\n\n\n<p><strong>Pas de traitement thermique post-soudage pour les \u00e9paisseurs de paroi sup\u00e9rieures \u00e0 19 mm<\/strong><br>Les op\u00e9rateurs omettent le traitement thermique post-soudage (PWHT), partant du principe que les petites branches pr\u00e9sentent peu de risques. Les donn\u00e9es recueillies sur le terrain contredisent cette hypoth\u00e8se.<\/p>\n\n\n\n<p><strong>Pas de v\u00e9rification de la duret\u00e9 sur le terrain<\/strong><br>Les essais de duret\u00e9 portables ne sont pas pr\u00e9vus dans les plans qualit\u00e9. Une duret\u00e9 de la zone affect\u00e9e par la chaleur (HAZ) sup\u00e9rieure \u00e0 26 HRC passe inaper\u00e7ue jusqu'\u00e0 la d\u00e9faillance.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-6-field-proven-data-from-middle-east-sour-gas-projects\">6. Donn\u00e9es valid\u00e9es sur le terrain issues de projets li\u00e9s au gaz acide au Moyen-Orient<\/h2>\n\n\n\n<p><strong>Port\u00e9e du projet :<\/strong>&nbsp;Plus de 200 raccordements par d\u00e9rivation \u00e0 chaud sur des gazoducs transportant du gaz acide au Qatar (champ du Nord), en Arabie saoudite (Khursaniyah, Wasit), aux \u00c9mirats arabes unis (gaz acide de Shah) et \u00e0 Oman.<\/p>\n\n\n\n<p><strong>PQR qualification rate:<\/strong>&nbsp;12% initial failure rate from hardness non-compliance. All corrected by extending PWHT soak time.<\/p>\n\n\n\n<p><strong>PWHT avoidance success rate:<\/strong>&nbsp;85% of controlled connections (12-inch and smaller, CE below 0.43, 150\u00b0C preheat) passed NACE hardness testing without PWHT.<\/p>\n\n\n\n<p><strong>Documented failure case:<\/strong>&nbsp;18-month in-service failure on dehydrated sour gas line. Cause: root-pass martensite from inadequate preheat penetration. Solution: increased preheat dwell time from 15 to 45 minutes.<\/p>\n\n\n\n<p><strong>Valve non-compliance rate:<\/strong>&nbsp;23% of site-audited NACE-certified valves failed hardness testing on trim components. Required upgrade from 316 to Monel K500.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-7-sour-service-vs-sweet-service-hot-tapping-key-differences\">7. Sour Service vs Sweet Service Hot Tapping: Key Differences<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Param\u00e8tres<\/th><th>Sweet Service (No H\u2082S)<\/th><th>Sour Service (H\u2082S Present)<\/th><\/tr><\/thead><tbody><tr><td>Maximum HAZ hardness<\/td><td>32 HRC per API 1104<\/td><td>22 HRC per NACE MR0175<\/td><\/tr><tr><td>PWHT requirement<\/td><td>Not required<\/td><td>Required if &gt;19 mm or parent &gt;20 HRC<\/td><\/tr><tr><td>Valve material<\/td><td>Standard API 6D<\/td><td>NACE-certified with 316\/Monel trim<\/td><\/tr><tr><td>Weld consumables<\/td><td>Any E7018<\/td><td>E7018-H4R (ultra-low hydrogen)<\/td><\/tr><tr><td>Post-weld testing<\/td><td>Visual + NDE only<\/td><td>Hardness + WFMPT + NACE TM0177<\/td><\/tr><tr><td>SSC risk<\/td><td>None<\/td><td>High if controls fail<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-8-inspection-requirements-after-hot-tap-welding-on-sour-gas-lines\">8. Inspection Requirements After Hot Tap Welding on Sour Gas Lines<\/h2>\n\n\n\n<p><strong>Mandatory inspections:<\/strong><\/p>\n\n\n\n<p><strong>100% visual inspection<\/strong>&nbsp;\u2013 AWS D1.1 acceptance criteria. Reject undercut exceeding 0.5 mm or visible cracks.<\/p>\n\n\n\n<p><strong>Weld hardness testing<\/strong>&nbsp;\u2013 Five locations minimum: weld toe, HAZ at 1 mm, 2 mm, 5 mm, and weld centerline. Use portable Equotip or Telebrineller.<\/p>\n\n\n\n<p><strong>Wet fluorescent magnetic particle testing (WFMPT)<\/strong>&nbsp;\u2013 Entire weld plus 25 mm onto pipe.<\/p>\n\n\n\n<p><strong>Rejection criteria:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hardness above 250 HV10 (22 HRC) \u2192 engineering evaluation<\/li>\n\n\n\n<li>Linear WFMPT indications longer than 1.5 mm in HAZ \u2192 remove and repair<\/li>\n\n\n\n<li>Porosity clusters exceeding 3% of weld area \u2192 reject<\/li>\n<\/ul>\n\n\n\n<p><strong>Repair limit:<\/strong>&nbsp;Maximum two attempts per location. Third failure requires branch removal.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-9-when-to-use-weld-overlay-instead-of-full-split-tee-replacement\">9. When to Use Weld Overlay Instead of Full Split Tee Replacement<\/h2>\n\n\n\n<p><strong>Indication:<\/strong>&nbsp;Existing pipe or fitting has hardness above 22 HRC but cannot be replaced.<\/p>\n\n\n\n<p><strong>Process:<\/strong>&nbsp;Apply 3 mm minimum Alloy 625 over the hot tap area, extending 50 mm beyond the branch footprint.<\/p>\n\n\n\n<p><strong>Advantages:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>40% less expensive than pipe replacement for single branches on 24-inch+ pipe<\/li>\n\n\n\n<li>No NACE hardness limit for Alloy 625<\/li>\n\n\n\n<li>Allows hot tapping on older pipelines with unknown hardness history<\/li>\n<\/ul>\n\n\n\n<p><strong>Disadvantages:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Requires automated GTAW overlay equipment<\/li>\n\n\n\n<li>Adds 8-12 hours per connection<\/li>\n\n\n\n<li>100% dye penetrant testing required before and after<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-10-standards-referenced\">10. Standards Referenced<\/h2>\n\n\n\n<p><strong>NACE MR0175 \/ ISO 15156 (Parts 1-3)<\/strong>&nbsp;\u2013 Materials for sour service. Hardness limits, SSC resistance, HIC testing.<\/p>\n\n\n\n<p><strong>NACE TM0177<\/strong>&nbsp;\u2013 Laboratory SSC testing. Method A tensile at 80% SMYS for 720 hours.<\/p>\n\n\n\n<p><strong>API 2201<\/strong>&nbsp;\u2013 Safe hot tapping practices for in-service pipelines.<\/p>\n\n\n\n<p><strong>API 6D<\/strong>&nbsp;\u2013 Pipeline valve specifications. NACE trim requirements.<\/p>\n\n\n\n<p><strong>ISO 15156-2 Annex B<\/strong>&nbsp;\u2013 Hardness traverse procedures for weldments.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-get-your-nace-compliant-material-selection-report-24-hour-turnaround\">Get Your NACE-Compliant Material Selection Report (24-Hour Turnaround)<\/h2>\n\n\n\n<p>Submit your gas composition and pipeline data to receive a complete engineering package.<\/p>\n\n\n\n<p><strong>Required data:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>H\u2082S content (percentage or partial pressure)<\/li>\n\n\n\n<li>CO\u2082 percentage<\/li>\n\n\n\n<li>Chloride level (ppm)<\/li>\n\n\n\n<li>Operating temperature (\u00b0C)<\/li>\n\n\n\n<li>Existing pipe material and wall thickness<\/li>\n<\/ul>\n\n\n\n<p><strong>You will receive within 24 hours:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Material selection report (split tee grade, valve specification, weld consumables)<\/li>\n\n\n\n<li>SSC risk assessment based on H\u2082S and hardness targets<\/li>\n\n\n\n<li>Welding procedure recommendation (draft WPS with preheat, PWHT, heat input limits)<\/li>\n\n\n\n<li>Hardness control and inspection plan for field execution<\/li>\n<\/ul>\n\n\n\n<p><strong>Contact JSW Sour Service Hot Tap Division:<\/strong><\/p>\n\n\n\n<p>Submit your gas composition sheet for compliance package.<\/p>\n\n\n\n<p>Request pre-qualified WPS documents for A350 LF2 hot taps.<\/p>\n\n\n\n<p>Schedule a technical presentation on SSC prevention strategies.<\/p>\n\n\n\n<p>JSW is an engineered manufacturer specializing in high-consequence pipeline branch connections for sour service, high-pressure, and cryogenic applications. All sour service split tees undergo 100% hardness verification before shipment with mill test reports certifying NACE MR0175\/ISO 15156 compliance.<\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>How to Prevent Sulfide Stress Cracking (SSC) in Split Tees, Valves, and Welds Under High H\u2082S Conditions NACE Requirements for Sour Gas Hot Tapping Introduction: What This Guide Covers Hot tapping on sour gas pipelines requires strict compliance with NACE MR0175\/ISO 15156. This guide provides material selection specifications, hardness control strategies with verified limits, SSC [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":5790,"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":[918,914,917,919,916,915],"class_list":["post-5789","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-hardness-limit-nace-mr0175-weld-haz","tag-hot-tapping-sour-gas","tag-nace-mr0175-compliance","tag-sour-service-valve-material-selection","tag-split-tee-sour-service","tag-ssc-prevention-pipelines"],"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 Sour Gas: NACE MR0175 Material Selection &amp; SSC Prevention | JSW<\/title>\n<meta name=\"description\" content=\"Maximum hardness 22 HRC for sour gas hot tap welds. 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