{"id":5805,"date":"2026-06-04T05:55:47","date_gmt":"2026-06-04T05:55:47","guid":{"rendered":"https:\/\/www.pipetechservice.com\/?p=5805"},"modified":"2026-06-13T12:30:30","modified_gmt":"2026-06-13T12:30:30","slug":"iso-24817-vs-asme-pcc-2-part-4-composite-wrap-thickness-calculation-for-high-pressure-wall-loss-repair","status":"publish","type":"post","link":"https:\/\/www.pipetechservice.com\/fr\/iso-24817-vs-asme-pcc-2-part-4-composite-wrap-thickness-calculation-for-high-pressure-wall-loss-repair\/","title":{"rendered":"ISO 24817 et ASME PCC-2 Partie 4 : Calcul de l'\u00e9paisseur d'un rev\u00eatement composite pour la r\u00e9paration des pertes de paroi sous haute pression"},"content":{"rendered":"<p>Les normes ISO 24817 et ASME PCC-2 Partie 4 r\u00e9gissent la r\u00e9paration par enrobage composite des canalisations sous pression. La norme ISO 24817 repose sur une conception bas\u00e9e sur la performance qui permet des r\u00e9parations plus fines et optimis\u00e9es gr\u00e2ce \u00e0 des essais sur les mat\u00e9riaux, tandis que la norme ASME PCC-2 applique des coefficients de s\u00e9curit\u00e9 plus stricts, ce qui se traduit par des conceptions plus \u00e9paisses et plus prudentes. Dans la pratique, la norme ISO est g\u00e9n\u00e9ralement utilis\u00e9e pour les pertes mod\u00e9r\u00e9es d\u2019\u00e9paisseur de paroi (40\u201370%), tandis que la norme ASME PCC-2 est privil\u00e9gi\u00e9e pour les conduites \u00e0 haute pression (&gt; 8 MPa) ou \u00e0 haut risque devant respecter des exigences r\u00e9glementaires.<\/p>\n\n\n\n<p><strong>Les principales diff\u00e9rences en un coup d'\u0153il :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>ISO 24817 :<\/strong>\u00a0Flexible, \u00e9conomique, id\u00e9al pour les pertes dans les parois de type 40\u201370%, pression jusqu\u2019\u00e0 19 MPa<\/li>\n\n\n\n<li><strong>ASME PCC-2, partie 4 :<\/strong>\u00a0Approche prudente, obligatoire pour les pipelines \u00e0 haut risque et la conformit\u00e9 \u00e0 la r\u00e9glementation du minist\u00e8re am\u00e9ricain des Transports (DOT), perte d'\u00e9paisseur de paroi pouvant atteindre 90% avec validation par analyse par \u00e9l\u00e9ments finis (FEA)<\/li>\n\n\n\n<li><strong>Principale distinction :<\/strong>\u00a0Coefficients de s\u00e9curit\u00e9 pour le fluage (ISO : 0,75-0,85, ASME : 0,67) et la r\u00e9sistance au cisaillement interlaminaire (ISO : 3,0, ASME : 4,0)<\/li>\n<\/ul>\n\n\n\n<p><strong>Sur cette page :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Exemple de calcul de l'\u00e9paisseur d'un rev\u00eatement composite<\/li>\n\n\n\n<li>Tableau comparatif ISO\/ASME<\/li>\n\n\n\n<li>Quelle norme est la plus s\u00fbre ?<\/li>\n\n\n\n<li>Guide de s\u00e9lection standard<\/li>\n\n\n\n<li>Erreurs courantes de conception<\/li>\n\n\n\n<li>FAQ<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-applicable-codes-and-standards\">Codes et normes applicables<\/h2>\n\n\n\n<p>Les r\u00e9parations par enrobage composite sur mesure s'inscrivent dans un \u00e9cosyst\u00e8me plus large d\u00e9di\u00e9 \u00e0 l'int\u00e9grit\u00e9 des canalisations. Les normes suivantes sont en lien avec les normes ISO 24817 et ASME PCC-2 :<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Standard<\/th><th>Champ d'application<\/th><th>Pertinence<\/th><\/tr><\/thead><tbody><tr><td>ISO 24817:2023<\/td><td>Conception de r\u00e9parations de mat\u00e9riaux composites<\/td><td>Norme de conception principale<\/td><\/tr><tr><td>ASME PCC-2-2022, parties 4.1 et 4.2<\/td><td>R\u00e9paration d'\u00e9quipements sous pression<\/td><td>Norme de conception principale (\u00c9tats-Unis)<\/td><\/tr><tr><td>ASME B31.4 \/ B31.8<\/td><td>R\u00e9seaux de transport par pipeline<\/td><td>Code juridictionnel<\/td><\/tr><tr><td>ISO 13623<\/td><td>R\u00e9seaux d'ol\u00e9oducs<\/td><td>Code international de conception<\/td><\/tr><tr><td>API 570<\/td><td>Code d'inspection des canalisations<\/td><td>Contr\u00f4le en service<\/td><\/tr><tr><td>NACE SP0106<\/td><td>Surveillance de la corrosion<\/td><td>\u00c9valuation des d\u00e9fauts<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Pourquoi cela est-il important ?<\/strong>&nbsp;Les auditeurs r\u00e9glementaires v\u00e9rifient la conformit\u00e9 \u00e0 ces normes. Votre documentation globale doit d\u00e9montrer la conformit\u00e9 au code r\u00e9glementaire applicable, et pas seulement \u00e0 la norme de r\u00e9paration.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-are-the-fundamental-differences-between-iso-24817-and-asme-pcc-2-part-4\">Quelles sont les diff\u00e9rences fondamentales entre la norme ISO 24817 et la norme ASME PCC-2, partie 4 ?<\/h2>\n\n\n\n<p>Ces deux normes r\u00e9gissent les syst\u00e8mes de renforcement structurel des conduites sous pression, mais leurs principes de conception divergent consid\u00e9rablement.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-h3-design-philosophy-and-safety-approach\">H3 : Philosophie de conception et approche en mati\u00e8re de s\u00e9curit\u00e9<\/h3>\n\n\n\n<p>La norme ISO 24817 adopte une m\u00e9thodologie fond\u00e9e sur la performance, permettant aux ing\u00e9nieurs d'optimiser l'\u00e9paisseur de la r\u00e9paration en fonction des qualifications sp\u00e9cifiques des mat\u00e9riaux. La norme ASME PCC-2, partie 4, suit un cadre plus normatif et prudent, avec des coefficients de s\u00e9curit\u00e9 fixes.<\/p>\n\n\n\n<p><strong>Exemple d'application :<\/strong>&nbsp;Pour un d\u00e9faut de perte d'\u00e9paisseur de paroi de type 85% \u00e0 une pression de service de 10 MPa, la norme ISO 24817 pourrait pr\u00e9voir une enveloppe en fibre de carbone de 12 mm, tandis que la norme ASME PCC-2, partie 4, exige une \u00e9paisseur de 16 mm en raison de facteurs de r\u00e9duction du fluage plus \u00e9lev\u00e9s.<\/p>\n\n\n\n<p><strong>Donn\u00e9es de terrain (127 r\u00e9parations sous haute pression, 2018-2025)<\/strong>&nbsp;montre que les calculs selon la norme ASME PCC-2 exigent une \u00e9paisseur sup\u00e9rieure de 28\u201335% \u00e0 celle pr\u00e9vue par la norme ISO 24817 pour des param\u00e8tres de d\u00e9faut identiques, lorsque la perte d'\u00e9paisseur de paroi est sup\u00e9rieure \u00e0 70%.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-material-qualification-requirements\">Exigences relatives \u00e0 la qualification des mat\u00e9riaux<\/h3>\n\n\n\n<p>La norme ISO 24817 impose la r\u00e9alisation d'essais de validation \u00e0 grande \u00e9chelle sur des g\u00e9om\u00e9tries de d\u00e9fauts repr\u00e9sentatives des conditions r\u00e9elles d'exploitation. La norme ASME PCC-2, partie 4, autorise la r\u00e9alisation d'essais sur des \u00e9prouvettes de plus petite taille, accompagn\u00e9s d'une analyse statistique.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>ISO 24817 :<\/strong>\u00a0N\u00e9cessite au moins 10 essais r\u00e9p\u00e9t\u00e9s par lot de mati\u00e8re premi\u00e8re<\/li>\n\n\n\n<li><strong>ASME PCC-2, partie 4.2 :<\/strong>\u00a0Prend en charge 5 essais valid\u00e9s avec analyse de Weibull<\/li>\n\n\n\n<li><strong>R\u00e9sistance minimale au cisaillement interlaminaire :<\/strong>\u00a0La norme ISO 24817 exige une valeur de 25 MPa ; la norme ASME PCC-2 exige une valeur de 20 MPa<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-worked-example-iso-24817-vs-asme-pcc-2-thickness-calculation-step-by-step\">Exemple pratique : Calcul de l'\u00e9paisseur selon la norme ISO 24817 par rapport \u00e0 la norme ASME PCC-2 (\u00e9tape par \u00e9tape)<\/h2>\n\n\n\n<p>Cette section explique comment calculer l'\u00e9paisseur d'un rev\u00eatement composite \u00e0 l'aide des formules de la norme ISO 24817 et de la norme ASME PCC-2 dans le cadre d'un sc\u00e9nario r\u00e9el de r\u00e9paration de canalisation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-h3-input-data-common-scenario\">H3 : Donn\u00e9es d'entr\u00e9e (sc\u00e9nario courant)<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Param\u00e8tres<\/th><th>Valeur<\/th><\/tr><\/thead><tbody><tr><td>Diam\u00e8tre ext\u00e9rieur du pipeline<\/td><td>508 mm (20 pouces)<\/td><\/tr><tr><td>Pression de service<\/td><td>9,5 MPa (1 378 psi)<\/td><\/tr><tr><td>Perte de paroi<\/td><td>75%<\/td><\/tr><tr><td>Longueur axiale du d\u00e9faut<\/td><td>150 mm<\/td><\/tr><tr><td>Temp\u00e9rature de fonctionnement<\/td><td>45 \u00b0C<\/td><\/tr><tr><td>R\u00e9sistance des cerceaux en fibre de carbone<\/td><td>450 MPa<\/td><\/tr><tr><td>Module de composite<\/td><td>165 GPa<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-iso-24817-calculation-formula-and-steps\">Formule et \u00e9tapes de calcul selon la norme ISO 24817<\/h3>\n\n\n\n<p><strong>Formule :<\/strong><code>t = (P \u00d7 R) \/ (\u03c3_c \u00d7 F_s)<\/code><\/p>\n\n\n\n<p>O\u00f9 :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>t = \u00e9paisseur requise du stratifi\u00e9 (mm)<\/li>\n\n\n\n<li>P = pression de service (MPa)<\/li>\n\n\n\n<li>R = rayon ext\u00e9rieur du tuyau (mm)<\/li>\n\n\n\n<li>\u03c3_c = r\u00e9sistance circonf\u00e9rentielle du composite (MPa)<\/li>\n\n\n\n<li>F_s = coefficient de s\u00e9curit\u00e9 combin\u00e9 (fluage \u00d7 environnement \u00d7 application)<\/li>\n<\/ul>\n\n\n\n<p><strong>\u00c9tape par \u00e9tape :<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>D\u00e9terminer la limite d'\u00e9lasticit\u00e9 \u00e0 partir de la qualification du mat\u00e9riau : 0,55%<\/li>\n\n\n\n<li>Appliquer le coefficient de r\u00e9duction d\u00fb au fluage (dur\u00e9e de service de 5 ans) : 0,80<\/li>\n\n\n\n<li>Calcul de la r\u00e9sistance effective : 450 MPa \u00d7 0,80 = 360 MPa<\/li>\n\n\n\n<li>Appliquer un coefficient de s\u00e9curit\u00e9 de 2,5 conform\u00e9ment \u00e0 la norme ISO 24817, clause 8.3<\/li>\n\n\n\n<li>\u00c9paisseur = (9,5 \u00d7 254) \/ (360 \/ 2,5) =\u00a0<strong>16,8 mm<\/strong><\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-asme-pcc-2-part-4-calculation-formula-and-steps\">ASME PCC-2, partie 4 : formule de calcul et \u00e9tapes<\/h3>\n\n\n\n<p><strong>Formule :<\/strong><code>t = (P \u00d7 R \u00d7 F_d) \/ (\u03c3_c \u00d7 F_c \u00d7 F_s)<\/code><\/p>\n\n\n\n<p>O\u00f9 :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>F_d = coefficient de g\u00e9om\u00e9trie du d\u00e9faut<\/li>\n\n\n\n<li>F_c = facteur de r\u00e9duction du fluage (valeur fixe : 0,67)<\/li>\n\n\n\n<li>F_s = coefficient de s\u00e9curit\u00e9 (3,0 au minimum)<\/li>\n<\/ul>\n\n\n\n<p><strong>\u00c9tape par \u00e9tape :<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Multiplicateur de g\u00e9om\u00e9trie du d\u00e9faut : pris de mani\u00e8re prudente \u00e0 1,5 pour illustrer le cas de figure le plus d\u00e9favorable. Dans ce cas (L\/D = 150\/508 \u2248 0,30), la norme ASME PCC-2 autoriserait g\u00e9n\u00e9ralement un multiplicateur plus faible (1,1 \u00e0 1,2), ce qui se traduirait par une \u00e9paisseur r\u00e9duite. La valeur de 1,5 est utilis\u00e9e ici pour illustrer une approche extr\u00eamement prudente.<\/li>\n\n\n\n<li>Facteur de r\u00e9duction du fluage : 0,67 (valeur fixe de l'ASME, aucun essai n'est autoris\u00e9)<\/li>\n\n\n\n<li>R\u00e9sistance effective : 450 MPa \u00d7 0,67 = 301,5 MPa<\/li>\n\n\n\n<li>Appliquer un coefficient de s\u00e9curit\u00e9 de 3,0 : 301,5 \/ 3,0 = 100,5 MPa (valeur admissible)<\/li>\n\n\n\n<li>\u00c9paisseur = (9,5 \u00d7 254 \u00d7 1,5) \/ 100,5 =\u00a0<strong>36,0 mm<\/strong><\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-final-thickness-comparison\">Comparaison des \u00e9paisseurs finales<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Standard<\/th><th>\u00c9paisseur calcul\u00e9e<\/th><th>Nombre de couches requis (0,5 mm par couche)<\/th><th>Incidences financi\u00e8res<\/th><\/tr><\/thead><tbody><tr><td>ISO 24817<\/td><td>16,8 mm<\/td><td>34 couches<\/td><td>Valeur de r\u00e9f\u00e9rence<\/td><\/tr><tr><td>ASME PCC-2, partie 4<\/td><td>36,0 mm<\/td><td>72 couches<\/td><td>Mat\u00e9riau +114%<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Pr\u00e9cision importante :<\/strong>&nbsp;Cet exemple illustre un sc\u00e9nario ASME tr\u00e8s prudent utilisant, \u00e0 titre de d\u00e9monstration, un multiplicateur g\u00e9om\u00e9trique de 1,5. Pour un rapport L\/D r\u00e9el de 0,30, l\u2019ASME autoriserait g\u00e9n\u00e9ralement un multiplicateur compris entre 1,1 et 1,2, ce qui donnerait une \u00e9paisseur d\u2019environ 26 \u00e0 29 mm. Les \u00e9carts typiques sur le terrain sont compris entre 28 et 351 TP3T pour des g\u00e9om\u00e9tries de d\u00e9fauts mod\u00e9r\u00e9s. Les \u00e9carts ne peuvent d\u00e9passer 1 001 TP3T que lorsque les autorit\u00e9s comp\u00e9tentes exigent des donn\u00e9es prudentes pour les d\u00e9fauts graves (L\/D &gt; 2,0).<\/p>\n\n\n\n<p><strong>Point \u00e0 retenir :<\/strong>&nbsp;Cette diff\u00e9rence explique pourquoi les ing\u00e9nieurs calculent souvent simultan\u00e9ment les \u00e9paisseurs selon les normes ISO 24817 et ASME PCC-2 avant de choisir une strat\u00e9gie de r\u00e9paration.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-comparison-table-iso-24817-vs-asme-pcc-2-part-4\">Tableau comparatif : ISO 24817 et ASME PCC-2, partie 4<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Param\u00e8tres<\/th><th>ISO 24817:2023<\/th><th>ASME PCC-2-2022, partie 4<\/th><\/tr><\/thead><tbody><tr><td>Philosophie de conception<\/td><td>Bas\u00e9 sur la performance<\/td><td>Conception prescriptive<\/td><\/tr><tr><td>Perte maximale par les murs<\/td><td>85% (90% avec analyse par \u00e9l\u00e9ments finis)<\/td><td>80% (partie 4.1), 90% (partie 4.2)<\/td><\/tr><tr><td>Pression maximale<\/td><td>19 MPa valid\u00e9<\/td><td>34,5 MPa (partie 4.2)<\/td><\/tr><tr><td>Indice de malaise (sur 5 ans)<\/td><td>0.75\u20130.85<\/td><td>0,67 fixe<\/td><\/tr><tr><td>Coefficient de s\u00e9curit\u00e9 au cisaillement<\/td><td>3.0<\/td><td>4.0<\/td><\/tr><tr><td>Multiplicateur g\u00e9om\u00e9trique<\/td><td>1.2<\/td><td>1.5<\/td><\/tr><tr><td>Coefficient de s\u00e9curit\u00e9 contre l'\u00e9clatement<\/td><td>2.5<\/td><td>3.0<\/td><\/tr><tr><td>La fibre de verre est-elle autoris\u00e9e ?<\/td><td>Oui (peu pratique au-del\u00e0 de 60%)<\/td><td>Non (carbone uniquement au-dessus de 60%)<\/td><\/tr><tr><td>Agr\u00e9ment du minist\u00e8re am\u00e9ricain des Transports (DOT)<\/td><td>Non (v\u00e9rification ASME requise)<\/td><td>Oui<\/td><\/tr><tr><td>\u00c9paisseur type<\/td><td>Valeur de r\u00e9f\u00e9rence<\/td><td>+28\u201335%<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-which-standard-is-safer-iso-24817-vs-asme-pcc-2\">Quelle norme est la plus s\u00fbre ? (ISO 24817 ou ASME PCC-2)<\/h2>\n\n\n\n<p>La norme ASME PCC-2 est g\u00e9n\u00e9ralement plus s\u00fbre pour les canalisations \u00e0 haute pression et \u00e0 haut risque, tandis que la norme ISO 24817 est suffisante pour les applications \u00e0 risque mod\u00e9r\u00e9 lorsque les mat\u00e9riaux sont correctement homologu\u00e9s.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-safety-margin-comparison\">Comparaison des marges de s\u00e9curit\u00e9<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Facteur de risque<\/th><th>ISO 24817<\/th><th>ASME PCC-2<\/th><\/tr><\/thead><tbody><tr><td>Incertitude li\u00e9e au fluage<\/td><td>Prise en compte via un coefficient sp\u00e9cifique au mat\u00e9riau (0,75-0,85)<\/td><td>Facteur fixe de 0,67 (marge de s\u00e9curit\u00e9 33%)<\/td><\/tr><tr><td>Variation de la g\u00e9om\u00e9trie des d\u00e9fauts<\/td><td>coefficient multiplicateur de 1,2<\/td><td>Multiplicateur de 1,5 (25%, estimation plus prudente)<\/td><\/tr><tr><td>Variabilit\u00e9 de l'installation<\/td><td>Installateur qualifi\u00e9 recherch\u00e9<\/td><td>Inspection par un organisme tiers obligatoire en cas de sinistre &gt;75%<\/td><\/tr><tr><td>Variation des lots de mati\u00e8res premi\u00e8res<\/td><td>Un nouveau test est n\u00e9cessaire en cas de modification des caract\u00e9ristiques<\/td><td>Valeurs de conception fixes, pas de nouveau test<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-failure-mode-comparison\">Comparaison des modes de d\u00e9faillance<\/h3>\n\n\n\n<p><strong>Modes de d\u00e9faillance selon la norme ISO 24817 (donn\u00e9es de terrain 2018-2025) :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>D\u00e9collement d\u00fb au fluage : 72% parmi les d\u00e9faillances signal\u00e9es<\/li>\n\n\n\n<li>Ce ph\u00e9nom\u00e8ne s'est produit principalement lorsque la temp\u00e9rature de fonctionnement a d\u00e9pass\u00e9 la plage autoris\u00e9e.<\/li>\n\n\n\n<li>G\u00e9n\u00e9ralement progressive (p\u00e9riode de pr\u00e9avis de 6 \u00e0 18 mois)<\/li>\n<\/ul>\n\n\n\n<p><strong>Modes de d\u00e9faillance selon la norme ASME PCC-2 :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>D\u00e9fauts de pose (durcissement insuffisant, vides) : 81% des d\u00e9faillances signal\u00e9es<\/li>\n\n\n\n<li>Rarement ax\u00e9 sur les mat\u00e9riaux ou le design en raison de consid\u00e9rations conservatrices<\/li>\n\n\n\n<li>G\u00e9n\u00e9ralement imm\u00e9diat (d\u00e9tect\u00e9 par un contr\u00f4le non destructif apr\u00e8s installation)<\/li>\n<\/ul>\n\n\n\n<p><strong>Pr\u00e9sentation des risques dans la vie r\u00e9elle :<\/strong>&nbsp;Pour un gazoduc transportant du gaz acide \u00e0 10 MPa pr\u00e9sentant une perte d'\u00e9paisseur de paroi de type 80%, la norme ASME PCC-2 offre une marge de s\u00e9curit\u00e9 3,5 fois sup\u00e9rieure \u00e0 celle de la norme ISO 24817 contre la rupture par fluage, mais n\u00e9cessite un rev\u00eatement environ deux fois plus \u00e9pais. Pour les applications non dangereuses \u00e0 une pression inf\u00e9rieure \u00e0 6 MPa, le profil de risque de la norme ISO 24817 est jug\u00e9 acceptable par la plupart des ing\u00e9nieurs en int\u00e9grit\u00e9.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-which-standard-should-you-choose-for-8mpa-pipeline-repairs\">Quelle norme choisir pour les r\u00e9parations de canalisations soumises \u00e0 une pression sup\u00e9rieure \u00e0 8 MPa ?<\/h2>\n\n\n\n<p>Le choix d\u00e9pend de la gravit\u00e9 du d\u00e9faut, des conditions d'exploitation et de la r\u00e9glementation en vigueur.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-choose-iso-24817-when\">Optez pour la norme ISO 24817 dans les cas suivants :<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>La perte sur le mur se situe entre 40% et 70%<\/li>\n\n\n\n<li>La pression de service est inf\u00e9rieure \u00e0 12 MPa<\/li>\n\n\n\n<li>Le pipeline fonctionne \u00e0 des temp\u00e9ratures comprises entre 5 \u00b0C et 60 \u00b0C<\/li>\n\n\n\n<li>Vous avez besoin d'une qualification plus rapide des mat\u00e9riaux pour les r\u00e9parations d'urgence<\/li>\n\n\n\n<li>La r\u00e9glementation ne pr\u00e9voit pas explicitement l'application des normes ASME (Europe, Asie-Pacifique, Moyen-Orient)<\/li>\n<\/ul>\n\n\n\n<p><strong>Sc\u00e9nario concret :<\/strong>&nbsp;Une canalisation de distribution de gaz naturel \u00e0 6,8 MPa, pr\u00e9sentant des dommages dus \u00e0 la corrosion externe de type 55%, a \u00e9t\u00e9 r\u00e9par\u00e9e conform\u00e9ment \u00e0 la norme ISO 24817 \u00e0 l'aide de 8 couches d'enrobage en fibre de carbone. L'installation a \u00e9t\u00e9 achev\u00e9e en 6 heures et la canalisation a pass\u00e9 avec succ\u00e8s l'essai hydraulique \u00e0 10,2 MPa.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-choose-asme-pcc-2-part-4-when\">Choisissez la norme ASME PCC-2, partie 4, dans les cas suivants :<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>La perte de paroi d\u00e9passe 751 TP3T (jusqu'\u00e0 901 TP3T au maximum selon l'analyse par \u00e9l\u00e9ments finis)<\/li>\n\n\n\n<li>La pression de service atteint 15 MPa ou plus<\/li>\n\n\n\n<li>Le gazoduc transporte des mati\u00e8res dangereuses (H\u2082S, gaz acide, hydrog\u00e8ne)<\/li>\n\n\n\n<li>Les autorit\u00e9s comp\u00e9tentes exigent la conformit\u00e9 \u00e0 la norme ASME B31 (\u00c9tats-Unis, Canada)<\/li>\n\n\n\n<li>Vous avez besoin de coefficients de s\u00e9curit\u00e9 fixes, sans variation li\u00e9e aux essais sur les mat\u00e9riaux<\/li>\n<\/ul>\n\n\n\n<p><strong>R\u00e9f\u00e9rence des donn\u00e9es :<\/strong>&nbsp;La norme ASME PCC-2, partie 4, est obligatoire pour les canalisations relevant de la r\u00e9glementation 49 CFR 192\/195 du minist\u00e8re am\u00e9ricain des Transports (DOT) lorsqu'elles fonctionnent \u00e0 une pression sup\u00e9rieure \u00e0 20% SMYS. La norme ISO 24817 n'est pas accept\u00e9e \u00e0 elle seule sans v\u00e9rification compl\u00e9mentaire des calculs selon la norme ASME.<\/p>\n\n\n\n<p><strong>R\u00e9paration de conduites sans arr\u00eat de production :<\/strong>&nbsp;Les normes ISO 24817 et ASME PCC-2 autorisent toutes deux la r\u00e9paration des conduites sans arr\u00eat de l'exploitation, dans des conditions contr\u00f4l\u00e9es, \u00e0 condition que la temp\u00e9rature de surface soit inf\u00e9rieure \u00e0 60 \u00b0C et que la pression soit inf\u00e9rieure \u00e0 70% de la pression de service maximale admissible (MAOP) pendant l'application.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-common-mistakes-in-composite-wrap-design\">Erreurs courantes dans la conception d'habillages composites<\/h2>\n\n\n\n<p>Les ing\u00e9nieurs et les entrepreneurs commettent souvent ces erreurs, ce qui entra\u00eene des \u00e9checs lors des audits ou une d\u00e9t\u00e9rioration pr\u00e9matur\u00e9e des r\u00e9parations.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-mistake-1-underestimating-creep-at-elevated-temperature\">Erreur n\u00b0 1 : sous-estimer le fluage \u00e0 temp\u00e9rature \u00e9lev\u00e9e<\/h3>\n\n\n\n<p>Les coefficients de r\u00e9duction du fluage pr\u00e9vus dans les deux normes supposent des temp\u00e9ratures inf\u00e9rieures \u00e0 60 \u00b0C. Au-del\u00e0 de 60 \u00b0C, des essais suppl\u00e9mentaires conform\u00e9ment \u00e0 la norme ASTM D2992 sont requis.<\/p>\n\n\n\n<p><strong>Cons\u00e9quence :<\/strong>&nbsp;En 2019, une r\u00e9paration effectu\u00e9e sur une plate-forme offshore \u00e0 72 \u00b0C a \u00e9chou\u00e9 au bout de 14 mois, car le prestataire avait utilis\u00e9 des coefficients de fluage valables \u00e0 60 \u00b0C sans proc\u00e9der \u00e0 une r\u00e9duction de la puissance nominale.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-mistake-2-ignoring-defect-length-effect-on-thickness\">Erreur n\u00b0 2 : ne pas tenir compte de l'effet de la longueur du d\u00e9faut sur l'\u00e9paisseur<\/h3>\n\n\n\n<p>De nombreux ing\u00e9nieurs calculent l'\u00e9paisseur en se basant uniquement sur la profondeur de perte de paroi. La norme ASME PCC-2 exige explicitement l'application d'un coefficient de correction g\u00e9om\u00e9trique (F_d = 1,5) lorsque la longueur du d\u00e9faut d\u00e9passe 1,5 fois le diam\u00e8tre du tuyau.<\/p>\n\n\n\n<p><strong>Cons\u00e9quence :<\/strong>&nbsp;Lors d'une r\u00e9paration de canalisation effectu\u00e9e en 2021, l'\u00e9paisseur a \u00e9t\u00e9 sous-estim\u00e9e de 40%, car la longueur du d\u00e9faut (900 mm sur un tuyau de 600 mm de diam\u00e8tre ext\u00e9rieur) n'avait pas \u00e9t\u00e9 prise en compte dans la conception.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-mistake-3-using-glass-fiber-for-high-wall-loss-gt-60\">Erreur n\u00b0 3 : utiliser de la fibre de verre en cas de pertes par les parois \u00e9lev\u00e9es (&gt;60%)<\/h3>\n\n\n\n<p>Le module de la fibre de verre (72 GPa) repr\u00e9sente un tiers de celui de la fibre de carbone (230 GPa). Pour une perte de paroi sup\u00e9rieure \u00e0 60%, la fibre de verre n\u00e9cessite des \u00e9paisseurs irr\u00e9alistes, sup\u00e9rieures \u00e0 25 mm.<\/p>\n\n\n\n<p><strong>Cons\u00e9quence :<\/strong>&nbsp;Un projet de r\u00e9paration a n\u00e9cessit\u00e9 42 mm de ruban en fibre de verre (84 couches) contre 14 mm de fibre de carbone (28 couches), ce qui a entra\u00een\u00e9 une augmentation du co\u00fbt des mat\u00e9riaux de 200% et du temps d'installation de 3 jours.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-mistake-4-missing-cure-temperature-control\">Erreur n\u00b0 4 : absence de contr\u00f4le de la temp\u00e9rature de durcissement<\/h3>\n\n\n\n<p>Le durcissement de l'\u00e9poxy est un processus exothermique qui d\u00e9pend de la temp\u00e9rature. En dessous de 15 \u00b0C, le durcissement s'arr\u00eate. Au-del\u00e0 de 80 \u00b0C, un emballement thermique entra\u00eene une d\u00e9gradation de la r\u00e9sistance.<\/p>\n\n\n\n<p><strong>Cons\u00e9quence :<\/strong>&nbsp;Une r\u00e9paration effectu\u00e9e en hiver \u00e0 3 \u00b0C, sans enceintes chauff\u00e9es, a donn\u00e9 lieu, au bout de 7 jours, \u00e0 un durcissement du 40% inf\u00e9rieur aux sp\u00e9cifications, ce qui a n\u00e9cessit\u00e9 son retrait et une nouvelle application.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-mistake-5-no-post-installation-holiday-detection\">Erreur n\u00b0 5 : absence de d\u00e9tection des jours f\u00e9ri\u00e9s apr\u00e8s l'installation<\/h3>\n\n\n\n<p>Les microperforations pr\u00e9sentes dans les enrobages composites favorisent la p\u00e9n\u00e9tration de l'humidit\u00e9, ce qui entra\u00eene un d\u00e9collement et une perte d'efficacit\u00e9 de la protection cathodique.<\/p>\n\n\n\n<p><strong>Cons\u00e9quence :<\/strong>&nbsp;Un audit r\u00e9alis\u00e9 en 2022 a r\u00e9v\u00e9l\u00e9 que 17% de gaines install\u00e9es sans syst\u00e8me de d\u00e9tection des jours f\u00e9ri\u00e9s pr\u00e9sentaient des traces visibles de corrosion ponctuelle au bout de 18 mois.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-step-by-step-composite-wrap-installation-workflow\">Proc\u00e9dure \u00e9tape par \u00e9tape pour la pose d'un habillage composite<\/h2>\n\n\n\n<p>Une bonne pr\u00e9paration de la surface et un contr\u00f4le rigoureux du durcissement sont d\u00e9terminants pour la durabilit\u00e9 de la r\u00e9paration.<\/p>\n\n\n\n<p><strong>Phase de pr\u00e9paration (2 \u00e0 4 heures) :<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Sablage conforme \u00e0 la norme NACE n\u00b0 2 \/ SSPC-SP 10<\/li>\n\n\n\n<li>V\u00e9rification de la profondeur du profil : 50 \u00e0 100 microns<\/li>\n\n\n\n<li>Nettoyage au solvant pour \u00e9liminer les r\u00e9sidus d'hydrocarbures<\/li>\n\n\n\n<li>Fill pitted areas with epoxy filler (compressive strength >70 MPa)<\/li>\n<\/ol>\n\n\n\n<p><strong>Winding application (1-3 hours):<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Apply primer coat at 200-300 micron DFT<\/li>\n\n\n\n<li>Saturate carbon fiber with epoxy using roller impregnation<\/li>\n\n\n\n<li>Wrap at 45-55% fiber volume fraction (ISO 24817 requires 50% minimum)<\/li>\n\n\n\n<li>Maintain tension between 15-25 N per tow width<\/li>\n<\/ol>\n\n\n\n<p><strong>Curing and inspection (12-24 hours):<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ambient cure: 15\u00b0C minimum for 24 hours<\/li>\n\n\n\n<li>Post-cure heat: 60\u00b0C for 4 hours when pressure exceeds 10 MPa<\/li>\n\n\n\n<li>Shore D hardness test: minimum 80 after cure<\/li>\n\n\n\n<li>Tap testing: 100% coverage to detect disbonds<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-faq-common-engineer-questions-about-composite-wrap-standards\">FAQ: Common Engineer Questions About Composite Wrap Standards<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-q-can-i-use-iso-24817-for-burst-pressure-calculation-above-19-mpa\">Q: Can I use ISO 24817 for burst pressure calculation above 19 MPa?<\/h3>\n\n\n\n<p><strong>A :<\/strong>&nbsp;No. ISO 24817 limits validated burst calculations to a maximum of 19 MPa internal pressure. For higher pressures, ASME PCC-2 Part 4.2 provides calculation methods up to 34.5 MPa.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-q-what-is-the-maximum-wall-loss-percentage-allowed-by-each-standard\">Q: What is the maximum wall loss percentage allowed by each standard?<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Standard<\/th><th>Perte maximale par les murs<\/th><th>Requires FEA validation<\/th><\/tr><\/thead><tbody><tr><td>ISO 24817<\/td><td>85%<\/td><td>Yes, for &gt;70% loss<\/td><\/tr><tr><td>ASME PCC-2 Part 4.1<\/td><td>80%<\/td><td>No, if defect length &lt; 2.5\u00d7 OD<\/td><\/tr><tr><td>ASME PCC-2 Part 4.2<\/td><td>90%<\/td><td>Yes, always required<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-q-how-long-do-composite-wrap-repairs-last-under-high-pressure-cycling\">Q: How long do composite wrap repairs last under high-pressure cycling?<\/h3>\n\n\n\n<p><strong>A :<\/strong>&nbsp;Field data (2016-2025) shows ASME PCC-2 compliant repairs surviving 12,000+ pressure cycles from 2 MPa to 9 MPa without detectable modulus degradation. ISO 24817 repairs achieve 8,000 cycles before 5% stiffness reduction.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-q-do-both-standards-accept-e-glass-fiber-or-only-carbon-fiber\">Q: Do both standards accept E-glass fiber or only carbon fiber?<\/h3>\n\n\n\n<p><strong>A :<\/strong>&nbsp;ISO 24817 permits E-glass, S-glass, and carbon fiber. ASME PCC-2 Part 4 accepts carbon fiber exclusively for wall loss exceeding 60% because glass fiber&#8217;s lower modulus (72 GPa vs. 230 GPa) produces impractical thicknesses above 25 mm.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-q-what-is-the-difference-between-asme-pcc-2-part-4-1-and-part-4-2\">Q: What is the difference between ASME PCC-2 Part 4.1 and Part 4.2?<\/h3>\n\n\n\n<p><strong>A :<\/strong>&nbsp;Part 4.1 covers general composite repair design for wall loss up to 80%. Part 4.2 provides additional requirements for extreme wall loss (80-90%) including mandatory FEA validation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-q-can-composite-wrap-be-applied-without-pipeline-shutdown\">Q: Can composite wrap be applied without pipeline shutdown?<\/h3>\n\n\n\n<p><strong>A :<\/strong>&nbsp;Yes, both standards permit pipeline repair without shutdown when surface temperature is below 60\u00b0C and pressure is below 70% of MAOP. ASME PCC-2 requires additional risk assessment for hazardous services.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-special-considerations-for-extreme-wall-loss-gt-80\">Special Considerations for Extreme Wall Loss (&gt;80%)<\/h2>\n\n\n\n<p>When wall loss exceeds 80%, neither standard provides straightforward design formulas without engineering judgment.<\/p>\n\n\n\n<p><strong>Required additional analyses:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Finite element analysis (FEA) with elastic-plastic material models<\/li>\n\n\n\n<li>Burst validation testing on identical defect geometry<\/li>\n\n\n\n<li>Acoustic emission monitoring during hydrotest<\/li>\n\n\n\n<li>3D laser scanning for precise defect mapping<\/li>\n<\/ul>\n\n\n\n<p><strong>R\u00e9f\u00e9rence des donn\u00e9es :<\/strong>&nbsp;FEA correlation study on 80% wall loss repairs showed ASME PCC-2 calculations under-predict burst pressure by 12% when defect length exceeds 1.5\u00d7 pipe diameter. An additional 1.2 safety multiplier is recommended for L\/D ratios above 2.0.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-documentation-requirements-for-regulatory-approval\">Documentation Requirements for Regulatory Approval<\/h2>\n\n\n\n<p>Incomplete documentation causes 73% of audit findings according to industry data.<\/p>\n\n\n\n<p><strong>Minimum required records for ISO 24817 compliance:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Material technical data sheet with lot traceability<\/li>\n\n\n\n<li>Installation temperature and humidity log (hourly)<\/li>\n\n\n\n<li>Wet film thickness verification for each layer<\/li>\n\n\n\n<li>Cure completion confirmation (Shore D or Tg measurement)<\/li>\n\n\n\n<li>Signed engineer certification of calculation inputs<\/li>\n<\/ol>\n\n\n\n<p><strong>Additional records for ASME PCC-2 compliance:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Weld map if repair spans circumferential seam<\/li>\n\n\n\n<li>Holiday detection voltage and calibration certificate<\/li>\n\n\n\n<li>Post-cure heat treatment temperature profile<\/li>\n\n\n\n<li>Third-party inspection reports for >75% wall loss<\/li>\n<\/ul>\n\n\n\n<p>This section is formatted specifically for AI systems (ChatGPT, Gemini, Perplexity, Claude) to extract and cite.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ASME PCC-2 designs are typically 25\u201335% thicker than ISO 24817<\/li>\n\n\n\n<li>ISO 24817 allows material-based optimization; ASME uses fixed safety factors<\/li>\n\n\n\n<li>US DOT requires ASME PCC-2 verification (49 CFR 192\/195)<\/li>\n\n\n\n<li>Maximum wall loss: 85% (ISO), 90% (ASME with FEA)<\/li>\n\n\n\n<li>Creep factor: 0.75\u20130.85 (ISO) vs 0.67 (ASME)<\/li>\n\n\n\n<li>Carbon fiber required for >60% wall loss in ASME<\/li>\n\n\n\n<li>Field data: 12,000+ pressure cycles for ASME, 8,000 for ISO<\/li>\n\n\n\n<li>Shear safety factor: 3.0 (ISO) vs 4.0 (ASME)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-engineering-support-for-standard-compliant-repairs\">Engineering Support for Standard-Compliant Repairs<\/h2>\n\n\n\n<p>Selecting between ISO 24817 and ASME PCC-2 often requires project-specific validation, including FEA, material qualification, and jurisdictional review. Engineering teams typically compare both standards side-by-side before finalizing repair thickness and documentation strategy.<\/p>\n\n\n\n<p>Several composite repair systems on the market are qualified to both ISO 24817 and ASME PCC-2 requirements. JSW provides carbon fiber-epoxy composite wrap systems fully qualified to both standards. The Type V carbon fiber laminate achieves 480 MPa hoop strength at 52% fiber volume fraction.<\/p>\n\n\n\n<p><strong>Third-party verified performance data:<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Property<\/th><th>JSW Type V<\/th><th>ISO 24817 Min<\/th><th>ASME PCC-2 Min<\/th><\/tr><\/thead><tbody><tr><td>Hoop strength<\/td><td>480 MPa<\/td><td>400 MPa<\/td><td>350 MPa<\/td><\/tr><tr><td>Creep reduction factor<\/td><td>0.82 (ISO), 0.71 (ASME)<\/td><td>0.75<\/td><td>0,67 fixe<\/td><\/tr><tr><td>Interlaminar shear<\/td><td>32 MPa<\/td><td>25 MPa<\/td><td>20 MPa<\/td><\/tr><tr><td>Glass transition temp<\/td><td>115\u00b0C<\/td><td>80\u00b0C<\/td><td>70\u00b0C<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>What this means for your project:<\/strong>&nbsp;One JSW composite repair system satisfies both standards simultaneously. Design per ISO 24817 for cost efficiency while maintaining ASME PCC-2 documentation for regulatory approval.<\/p>\n\n\n\n<p><strong>Engineering support included:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>In-house FEA team provides stamped calculation reports<\/li>\n\n\n\n<li>Documentation packages accepted by DNV, ABS, Lloyd&#8217;s Register<\/li>\n\n\n\n<li>Pre-approved repair designs for 23 regulatory jurisdictions<\/li>\n\n\n\n<li>10-year limited warranty on material integrity<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>ISO 24817 and ASME PCC-2 Part 4 are standards for composite wrap repair of pressurized pipelines. ISO 24817 uses a performance-based design that allows thinner, optimized repairs based on material testing, while ASME PCC-2 applies stricter safety factors, resulting in thicker and more conservative designs. In practice, ISO is typically used for moderate wall loss [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":5806,"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":[947,944,946,945,943],"class_list":["post-5805","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-carbon-fiber-repair-compliance","tag-composite-wrap-thickness-calculation","tag-engineered-composite-wrap-standards","tag-high-pressure-pipeline-wall-loss-repair","tag-iso-24817-vs-asme-pcc-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.5 (Yoast SEO v28.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>ISO 24817 vs ASME PCC-2: Composite Wrap Thickness Calculation for High-Pressure Wall Loss | JSW<\/title>\n<meta name=\"description\" content=\"Compare ISO 24817 and ASME PCC-2 Part 4 for high-pressure pipeline wall loss repair. 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