{"id":5437,"date":"2026-04-17T06:08:04","date_gmt":"2026-04-17T06:08:04","guid":{"rendered":"https:\/\/www.pipetechservice.com\/?p=5437"},"modified":"2026-06-20T00:52:29","modified_gmt":"2026-06-20T00:52:29","slug":"cipp-vs-slip-lining-which-is-more-cost-effective-for-large-diameter-pipes","status":"publish","type":"post","link":"https:\/\/www.pipetechservice.com\/fr\/cipp-vs-slip-lining-which-is-more-cost-effective-for-large-diameter-pipes\/","title":{"rendered":"CIPP ou chemisage : quelle est la solution la plus rentable pour les canalisations de grand diam\u00e8tre ?"},"content":{"rendered":"<p>Pour les canalisations de grand diam\u00e8tre (g\u00e9n\u00e9ralement 36 pouces et plus), la technique CIPP s'av\u00e8re g\u00e9n\u00e9ralement plus rentable que le chemisage par glissement si l'on tient compte du co\u00fbt total du projet, des perturbations op\u00e9rationnelles et des performances \u00e0 long terme, m\u00eame si le chemisage par glissement pr\u00e9sente des avantages dans certains cas particuliers, notamment en cas de d\u00e9gradation structurelle importante ou de profils non circulaires.<\/p>\n\n\n\n<p>Ce guide complet compare les deux m\u00e9thodes de r\u00e9habilitation de canalisations sans tranch\u00e9e en fonction des co\u00fbts des mat\u00e9riaux, des exigences d'installation, des temps d'arr\u00eat, de la durabilit\u00e9 et de l'ad\u00e9quation \u00e0 l'application. Vous d\u00e9couvrirez le fonctionnement de chaque technique, les facteurs qui influencent leur structure tarifaire, les sc\u00e9narios dans lesquels une m\u00e9thode est pr\u00e9f\u00e9rable \u00e0 l\u2019autre, ainsi que la mani\u00e8re de calculer la rentabilit\u00e9 r\u00e9elle de votre projet de canalisation de grand diam\u00e8tre destin\u00e9 au transport d\u2019eau, de p\u00e9trole, d\u2019air ou d\u2019eaux us\u00e9es. S'appuyant sur des donn\u00e9es r\u00e9elles issues de projets de r\u00e9habilitation de canalisations men\u00e9s \u00e0 bien par Beijing Jinshiwan Pipeline Technology Co., Ltd. dans les domaines du gaz naturel, du raffinage du p\u00e9trole, des fluides \u00e0 haute temp\u00e9rature et de la cok\u00e9faction de l'acier, cet article fournit des informations concr\u00e8tes aux propri\u00e9taires d'infrastructures et aux entrepreneurs sp\u00e9cialis\u00e9s dans les canalisations.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-are-cipp-and-slip-lining-understanding-the-two-primary-trenchless-technologies\">Que sont le CIPP et le chemisage ? Comprendre les deux principales technologies sans tranch\u00e9e<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-cured-in-place-pipe-cipp-how-it-works\">Tuyaux durcis sur place (CIPP) : comment \u00e7a marche ?<\/h3>\n\n\n\n<p>La technique CIPP consiste \u00e0 ins\u00e9rer une gaine en feutre impr\u00e9gn\u00e9 de r\u00e9sine ou en fibre de verre dans la canalisation existante, puis \u00e0 la faire durcir \u00e0 l'aide d'eau chaude, de vapeur ou de rayons ultraviolets afin de former une nouvelle canalisation structurelle \u00e0 l'int\u00e9rieur de la canalisation d'origine. Pour les canalisations de grand diam\u00e8tre, l'\u00e9paisseur des gaines CIPP varie g\u00e9n\u00e9ralement entre 6 mm et 25 mm, en fonction du diam\u00e8tre et des exigences de pression.<\/p>\n\n\n\n<p><strong>Pourquoi la technique CIPP s'impose dans les projets de grands diam\u00e8tres :<\/strong>&nbsp;La gaine impr\u00e9gn\u00e9e de r\u00e9sine \u00e9pouse parfaitement la surface int\u00e9rieure du tuyau h\u00f4te, cr\u00e9ant ainsi un nouveau tuyau sans soudure, sans joint et r\u00e9sistant \u00e0 la corrosion. Cette m\u00e9thode permet de conserver pr\u00e8s de 100% de la section transversale d'origine tout en renfor\u00e7ant la r\u00e9sistance structurelle.<\/p>\n\n\n\n<p><strong>\u00c9tapes typiques de la pose d'un syst\u00e8me CIPP de grand diam\u00e8tre :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pr\u00e9paration du site et mise en place du syst\u00e8me de pompage de d\u00e9rivation (n\u00e9cessitant souvent l'utilisation de bouchons de canalisation et de syst\u00e8mes d'obturation)<\/li>\n\n\n\n<li>Nettoyage et inspection par cam\u00e9ra de la conduite principale<\/li>\n\n\n\n<li>Impr\u00e9gnation de la doublure avec une r\u00e9sine thermodurcissable (polyester, vinylester ou \u00e9poxy)<\/li>\n\n\n\n<li>Inversion ou insertion de la gaine \u00e0 l'aide d'un treuil<\/li>\n\n\n\n<li>Processus de s\u00e9chage (\u00e0 la vapeur ou \u00e0 l'eau chaude pendant 4 \u00e0 12 heures, selon le diam\u00e8tre)<\/li>\n\n\n\n<li>Finition des extr\u00e9mit\u00e9s et rebranchement des raccordements lat\u00e9raux<\/li>\n\n\n\n<li>Inspection finale par cam\u00e9ra et essais de pression<\/li>\n<\/ul>\n\n\n\n<p><strong>Donn\u00e9es sur les performances du secteur :<\/strong>&nbsp;Les gaines CIPP correctement install\u00e9es ont une dur\u00e9e de vie nominale de plus de 50 ans, avec des r\u00e9sistances \u00e0 la traction sup\u00e9rieures \u00e0 5 000 psi et des modules de flexion sup\u00e9rieurs \u00e0 250 000 psi, conform\u00e9ment \u00e0 la norme ASTM F1216.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-slip-lining-how-it-works\">Le chemisage : comment \u00e7a marche ?<\/h3>\n\n\n\n<p>Le chemisage consiste \u00e0 ins\u00e9rer un nouveau tuyau de plus petit diam\u00e8tre (g\u00e9n\u00e9ralement en PEHD, en fibre de verre ou en acier) \u00e0 l'int\u00e9rieur du tuyau existant, puis \u00e0 colmater l'espace annulaire entre l'ancien et le nouveau tuyau. Cette m\u00e9thode r\u00e9duit la capacit\u00e9 hydraulique du tuyau, mais permet une installation rapide sur des tron\u00e7ons de tuyau rectilignes.<\/p>\n\n\n\n<p><strong>Quand le chemisage est indiqu\u00e9 :<\/strong>&nbsp;Pour les canalisations fortement d\u00e9t\u00e9rior\u00e9es sur lesquelles la technique CIPP ne permet pas une bonne adh\u00e9rence, ou lorsque la canalisation existante pr\u00e9sente des d\u00e9bris de grande taille, des d\u00e9calages ou une ovalisation qui emp\u00eachent l'insertion de la gaine. Le chemisage par glissement convient \u00e9galement aux formes non circulaires, telles que les \u00e9gouts en forme d'\u0153uf ou les ponceaux rectangulaires.<\/p>\n\n\n\n<p><strong>D\u00e9roulement type d'une pose par chemisage :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Nettoyage des canalisations et \u00e9limination des d\u00e9bris<\/li>\n\n\n\n<li>Excavation des fosses d'insertion (g\u00e9n\u00e9ralement tous les 300 \u00e0 500 pieds)<\/li>\n\n\n\n<li>Pose de canalisations avec raccords ou soud\u00e9es (les sections en PEHD sont soud\u00e9es bout \u00e0 bout sur place)<\/li>\n\n\n\n<li>Injection de coulis dans l'espace annulaire<\/li>\n\n\n\n<li>\u00c9tanch\u00e9ification des extr\u00e9mit\u00e9s et remise en \u00e9tat des raccordements<\/li>\n\n\n\n<li>Durcissement du coulis (24 \u00e0 48 heures avant la mise sous pression)<\/li>\n<\/ul>\n\n\n\n<p><strong>Caract\u00e9ristiques techniques :<\/strong>&nbsp;Un tuyau de grand diam\u00e8tre \u00e0 rev\u00eatement coulissant perd g\u00e9n\u00e9ralement entre 10 et 20% de sa section transversale en raison de l'\u00e9paisseur de la nouvelle paroi du tuyau et de l'espace annulaire de coulis. La r\u00e9duction de la capacit\u00e9 d'\u00e9coulement doit \u00eatre calcul\u00e9e avec soin pour les \u00e9gouts gravitaires et les r\u00e9seaux d'eaux pluviales.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-direct-cost-comparison-cipp-vs-slip-lining-for-large-diameter-pipes-36-inch-to-120-inch\">Comparaison directe des co\u00fbts : CIPP vs. chemisage pour les canalisations de grand diam\u00e8tre (de 36 pouces \u00e0 120 pouces)<\/h2>\n\n\n\n<p>Pour bien appr\u00e9hender la rentabilit\u00e9 r\u00e9elle, il faut ventiler les d\u00e9penses entre les co\u00fbts des mat\u00e9riaux, de la main-d'\u0153uvre, des \u00e9quipements et les co\u00fbts cach\u00e9s. Le tableau ci-dessous pr\u00e9sente des donn\u00e9es de r\u00e9f\u00e9rence du secteur pour les projets de r\u00e9habilitation de canalisations de grand diam\u00e8tre.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Cat\u00e9gorie de co\u00fbt<\/th><th>CIPP (diam\u00e8tre de 42 pouces)<\/th><th>Rev\u00eatement par glissement (HDPE de 42 pouces)<\/th><th>Principaux facteurs de co\u00fbt<\/th><\/tr><\/thead><tbody><tr><td>Co\u00fbt des mat\u00e9riaux par pied lin\u00e9aire<\/td><td>$180 \u2013 $350<\/td><td>$120 \u2013 $200<\/td><td>Type de r\u00e9sine et \u00e9paisseur de paroi en PEHD<\/td><\/tr><tr><td>Main-d'\u0153uvre et installation<\/td><td>$150 \u2013 $250<\/td><td>$100 \u2013 $180<\/td><td>Effectif de l'\u00e9quipe et temps de durcissement<\/td><\/tr><tr><td>Mobilisation du mat\u00e9riel<\/td><td>$15 000 \u2013 $40 000<\/td><td>$8 000 \u2013 $20 000<\/td><td>Chaudi\u00e8re de durcissement vs machines de fusion<\/td><\/tr><tr><td>Pompage en d\u00e9rivation (eau\/air)<\/td><td>$20 \u2013 $50 par heure<\/td><td>$20 \u2013 $50 par heure<\/td><td>D\u00e9bit et dur\u00e9e<\/td><\/tr><tr><td>Mat\u00e9riaux de jointoiement<\/td><td>Sans objet<\/td><td>$30 \u2013 $60 par pied lin\u00e9aire<\/td><td>Volume de l'espace annulaire<\/td><\/tr><tr><td>Contr\u00f4le et r\u00e9tablissement du trafic<\/td><td>$10 000 \u2013 $30 000<\/td><td>$8 000 \u2013 $25 000<\/td><td>Dimensions de la fosse d'excavation<\/td><\/tr><tr><td><strong>Co\u00fbt total par pied lin\u00e9aire (installation comprise)<\/strong><\/td><td><strong>$350 \u2013 $650<\/strong><\/td><td><strong>$280 \u2013 $500<\/strong><\/td><td>Diam\u00e8tre et conditions du site<\/td><\/tr><tr><td>Co\u00fbt total pour 1 000 pieds<\/td><td>$350 000 \u2013 $650 000<\/td><td>$280 000 \u2013 $500 000<\/td><td>\u2013<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Remarque importante tir\u00e9e des donn\u00e9es relatives aux projets du secteur :<\/strong>&nbsp;Si la technique de chemisage pr\u00e9sente des co\u00fbts initiaux de mat\u00e9riaux inf\u00e9rieurs de 20 \u00e0 30%, la diff\u00e9rence de co\u00fbt total d'installation se r\u00e9duit consid\u00e9rablement lorsqu'on tient compte des fosses d'excavation (n\u00e9cessaires tous les 300 \u00e0 500 pieds pour le chemisage), des mat\u00e9riaux de coulis et de la main-d'\u0153uvre, ainsi que de la v\u00e9rification du d\u00e9bit apr\u00e8s installation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-hidden-cost-factors-that-change-the-equation\">Les facteurs de co\u00fbts cach\u00e9s qui changent la donne<\/h3>\n\n\n\n<p><strong>Co\u00fbts cach\u00e9s sp\u00e9cifiques \u00e0 la technique CIPP pour les grands diam\u00e8tres :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u00c9limination des d\u00e9chets de r\u00e9sine (g\u00e9n\u00e9ralement 5 \u00e0 101 TP3T de r\u00e9sine en exc\u00e8s)<\/li>\n\n\n\n<li>Des temps de durcissement plus longs (le durcissement \u00e0 la vapeur pour un tuyau de 96 pouces peut d\u00e9passer 24 heures)<\/li>\n\n\n\n<li>\u00c9quipements sp\u00e9cialis\u00e9s pour l'impr\u00e9gnation des rev\u00eatements (impr\u00e9gnation en usine ou sur site)<\/li>\n\n\n\n<li>La dur\u00e9e du pompage en d\u00e9rivation correspond au temps de prise plus le temps de durcissement<\/li>\n<\/ul>\n\n\n\n<p><strong>Co\u00fbts cach\u00e9s sp\u00e9cifiques \u00e0 la technique du \u00ab slip-lining \u00bb :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Plusieurs fosses d'insertion (chacune n\u00e9cessitant des travaux d'excavation, de sout\u00e8nement et de remise en \u00e9tat)<\/li>\n\n\n\n<li>Contr\u00f4le de la qualit\u00e9 du coulis annulaire (c\u00f4ne d'\u00e9coulement et r\u00e9sistance \u00e0 la compression selon la norme ASTM C939)<\/li>\n\n\n\n<li>La diminution de la capacit\u00e9 de d\u00e9bit pourrait n\u00e9cessiter \u00e0 l'avenir des travaux de modernisation des stations de pompage<\/li>\n\n\n\n<li>Contr\u00f4le de l'int\u00e9grit\u00e9 des joints pour les sections en PEHD soud\u00e9es<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-operational-disruption-and-downtime-which-method-minimizes-service-interruption\">Perturbations op\u00e9rationnelles et temps d'arr\u00eat : quelle m\u00e9thode permet de r\u00e9duire au minimum les interruptions de service ?<\/h2>\n\n\n\n<p>Pour les canalisations assurant des services essentiels d'approvisionnement en eau, en p\u00e9trole ou en air, les co\u00fbts li\u00e9s aux temps d'arr\u00eat d\u00e9passent souvent ceux de la remise en \u00e9tat. Une conduite d'eau principale de grand diam\u00e8tre desservant 50 000 clients entra\u00eene des pertes quotidiennes consid\u00e9rables en termes de recettes et de co\u00fbts sociaux.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-downtime-comparison-by-method\">Comparaison des temps d'arr\u00eat par m\u00e9thode<\/h3>\n\n\n\n<p><strong>Profil des temps d'arr\u00eat li\u00e9s \u00e0 la technique CIPP (section type de 42 pouces de diam\u00e8tre et 1 000 pieds de longueur) :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mise en place de la d\u00e9rivation et installation du bouchon de canalisation : 8 \u00e0 12 heures<\/li>\n\n\n\n<li>Nettoyage des canalisations et inspection par cam\u00e9ra : 6 \u00e0 8 heures<\/li>\n\n\n\n<li>Mise en place de la proth\u00e8se : 2 \u00e0 4 heures<\/li>\n\n\n\n<li>Durcissement (eau chaude ou vapeur) : 8 \u00e0 16 heures<\/li>\n\n\n\n<li>Repos et r\u00e9cup\u00e9ration : 4 \u00e0 6 heures<\/li>\n\n\n\n<li><strong>Dur\u00e9e totale d'indisponibilit\u00e9 : 28 \u00e0 46 heures<\/strong><\/li>\n<\/ul>\n\n\n\n<p><strong>Profil des temps d'arr\u00eat li\u00e9s \u00e0 la pose d'un rev\u00eatement int\u00e9rieur (m\u00eames sp\u00e9cifications) :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mise en place de la d\u00e9rivation et installation du bouchon de canalisation : 8 \u00e0 12 heures (par fosse d'insertion)<\/li>\n\n\n\n<li>Nettoyage des canalisations : 6 \u00e0 8 heures par tron\u00e7on<\/li>\n\n\n\n<li>Soudage et insertion de canalisations en PEHD : 4 \u00e0 6 heures par tron\u00e7on de 500 pieds<\/li>\n\n\n\n<li>Injection de coulis et prise : 24 \u00e0 48 heures (chemin critique)<\/li>\n\n\n\n<li>Essais de pression et remise en service : 4 \u00e0 6 heures<\/li>\n\n\n\n<li><strong>Dur\u00e9e totale d'indisponibilit\u00e9 : 54 \u00e0 86 heures (n\u00e9cessitant souvent plusieurs arr\u00eats)<\/strong><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-how-pipeline-plug-and-pipeline-stopple-systems-affect-downtime\">Comment les syst\u00e8mes de bouchons et de obturateurs de conduites influent sur les temps d'arr\u00eat<\/h3>\n\n\n\n<p>Les technologies modernes d'obturation et de bouchon de canalisation ont consid\u00e9rablement r\u00e9duit les besoins en d\u00e9rivation. Un bouchon de canalisation (obturateur temporaire qui isole une section tout en maintenant le d\u00e9bit via une d\u00e9rivation) permet :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Isolation en un seul point plut\u00f4t qu'une vidange compl\u00e8te de la conduite<\/li>\n\n\n\n<li>R\u00e9duction des besoins en capacit\u00e9 de pompage de d\u00e9rivation (r\u00e9duction de 50 \u00e0 701 TP3T)<\/li>\n\n\n\n<li>Insertion et retrait plus rapides par rapport aux bouchons m\u00e9caniques traditionnels pour canalisations<\/li>\n<\/ul>\n\n\n\n<p>Pour les projets de CIPP de grand diam\u00e8tre, un syst\u00e8me de bouchons de canalisation peut r\u00e9duire la dur\u00e9e d'interruption de service de 8 \u00e0 12 heures en \u00e9vitant de devoir vidanger de longues sections. Cet avantage est moins marqu\u00e9 dans le cas du chemisage par glissement, car la pr\u00e9sence de plusieurs fosses d'insertion n\u00e9cessite des installations r\u00e9p\u00e9t\u00e9es de bouchons.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-flow-capacity-and-hydraulic-performance-a-critical-cost-effectiveness-factor\">D\u00e9bit et performances hydrauliques : un facteur d\u00e9terminant pour le rapport co\u00fbt-efficacit\u00e9<\/h2>\n\n\n\n<p>La r\u00e9duction de la capacit\u00e9 de d\u00e9bit a un impact direct sur les co\u00fbts d'exploitation \u00e0 long terme et peut n\u00e9cessiter des travaux de modernisation co\u00fbteux des infrastructures. Ce facteur d\u00e9termine souvent quelle m\u00e9thode s'av\u00e8re r\u00e9ellement la plus rentable sur une dur\u00e9e de vie nominale de 50 ans.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-cipp-flow-capacity-retention\">Maintien de la capacit\u00e9 de d\u00e9bit du syst\u00e8me CIPP<\/h3>\n\n\n\n<p>Les gaines CIPP ont g\u00e9n\u00e9ralement une \u00e9paisseur comprise entre 6 et 15 mm pour les canalisations de grand diam\u00e8tre, ce qui r\u00e9duit le diam\u00e8tre int\u00e9rieur de 0,5 \u00e0 1,2 pouce. Pour une canalisation de 48 pouces :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Section transversale d'origine : 1 809 pouces carr\u00e9s<\/li>\n\n\n\n<li>Surface rev\u00eatue par la technique CIPP (gaine de 12 mm) : 1 769 pouces carr\u00e9s<\/li>\n\n\n\n<li>R\u00e9duction de la surface : 2,21 TP3T<\/li>\n\n\n\n<li>R\u00e9duction du d\u00e9bit (\u00e9coulement par gravit\u00e9, \u00e9quation de Manning) : environ 3 \u00e0 41 TP3T<\/li>\n<\/ul>\n\n\n\n<p><strong>Lorsque la technologie CIPP permet de maintenir ou d'am\u00e9liorer le d\u00e9bit :<\/strong>&nbsp;La surface int\u00e9rieure lisse des canalisations CIPP (coefficient de Manning n = 0,009-0,010 contre 0,013-0,015 pour les anciennes canalisations en b\u00e9ton ou en terre cuite) augmente souvent la vitesse d'\u00e9coulement malgr\u00e9 la l\u00e9g\u00e8re r\u00e9duction de diam\u00e8tre. La mod\u00e9lisation hydraulique montre que, pour les canalisations dont le coefficient de Manning d'origine est sup\u00e9rieur \u00e0 0,013, la technique CIPP peut en r\u00e9alit\u00e9 augmenter la capacit\u00e9 d'\u00e9coulement de 5 \u00e0 151 TP3T.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-slip-lining-flow-capacity-loss\">Perte de d\u00e9bit due au rev\u00eatement par glissement<\/h3>\n\n\n\n<p>La technique de rev\u00eatement par glissement r\u00e9duit le diam\u00e8tre int\u00e9rieur de mani\u00e8re plus significative. Pour une canalisation h\u00f4te de 48 pouces \u00e9quip\u00e9e d\u2019un rev\u00eatement en PEHD de 42 pouces (\u00e9paisseur de paroi typique de 1,5 pouce, plus un espace annulaire de 1 pouce destin\u00e9 au coulis) :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Nouveau diam\u00e8tre int\u00e9rieur : 42 pouces<\/li>\n\n\n\n<li>Nouvelle section transversale : 1 385 pouces carr\u00e9s<\/li>\n\n\n\n<li>R\u00e9duction de la superficie : 23,41 TP3T<\/li>\n\n\n\n<li>R\u00e9duction du d\u00e9bit (\u00e9coulement par gravit\u00e9) : 25 \u00e0 351 TP3T selon la pente<\/li>\n<\/ul>\n\n\n\n<p><strong>Cons\u00e9quence pratique :<\/strong>&nbsp;Une canalisation d'\u00e9gout par gravit\u00e9 de 48 pouces, dont le diam\u00e8tre a \u00e9t\u00e9 r\u00e9duit \u00e0 42 pouces par gainage, peut n\u00e9cessiter une pente accrue (ce qui est souvent impossible sur un terrain plat), la modernisation des stations de pompage ou la mise en place de conduites parall\u00e8les suppl\u00e9mentaires.<\/p>\n\n\n\n<p><strong>Exception o\u00f9 la technique de rev\u00eatement par glissement s'impose :<\/strong>&nbsp;Pour les conduites de refoulement (conduites sous pression), la r\u00e9duction du d\u00e9bit est proportionnelle \u00e0 la r\u00e9duction du diam\u00e8tre \u00e9lev\u00e9e \u00e0 la puissance 2,5. Une r\u00e9duction de 48 pouces \u00e0 42 pouces (perte de diam\u00e8tre de 12,51 TP3T) r\u00e9duit la capacit\u00e9 de pompage d'environ 281 TP3T, mais peut \u00eatre acceptable si le syst\u00e8me d'origine disposait d'une capacit\u00e9 exc\u00e9dentaire.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-application-specific-cost-effectiveness-which-method-wins-by-pipe-condition-and-material\">Rentabilit\u00e9 en fonction de l'application : quelle m\u00e9thode s'impose en fonction de l'\u00e9tat et du mat\u00e9riau des canalisations ?<\/h2>\n\n\n\n<p>Selon l'\u00e9tat des canalisations, les mat\u00e9riaux utilis\u00e9s et les conditions d'exploitation, certaines m\u00e9thodes s'av\u00e8rent plus adapt\u00e9es que d'autres. Cette section pr\u00e9sente des crit\u00e8res de d\u00e9cision fond\u00e9s sur les r\u00e9sultats concrets de projets r\u00e9els.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-when-cipp-is-clearly-more-cost-effective\">Lorsque la m\u00e9thode CIPP s'av\u00e8re clairement plus rentable<\/h3>\n\n\n\n<p><strong>1. Conduites principales d'adduction d'eau de grand diam\u00e8tre (36 \u00e0 120 pouces)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>La technique CIPP permet de maintenir une capacit\u00e9 de d\u00e9bit essentielle pour r\u00e9pondre aux exigences en mati\u00e8re de d\u00e9bit d'extinction<\/li>\n\n\n\n<li>Le rev\u00eatement sans joint emp\u00eache les fuites<\/li>\n\n\n\n<li>La technique CIPP permet de r\u00e9tablir la pression nominale de conception avec une \u00e9paisseur de paroi minimale<\/li>\n<\/ul>\n\n\n\n<p><strong>2. R\u00e9seaux d'assainissement comportant plusieurs raccordements lat\u00e9raux<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Les gaines CIPP peuvent \u00eatre facilement remises en place (d\u00e9coupe robotis\u00e9e des ouvertures lat\u00e9rales)<\/li>\n\n\n\n<li>La technique du \u00ab slip-lining \u00bb n\u00e9cessite de creuser et de rebrancher chaque branche une par une.<\/li>\n\n\n\n<li>Pour une canalisation d'\u00e9gout de 60 pouces comportant 40 branchements par 1 000 pieds, la technique de chemisage entra\u00eene des co\u00fbts suppl\u00e9mentaires importants li\u00e9s au raccordement des branchements.<\/li>\n<\/ul>\n\n\n\n<p><strong>3. Conduites pr\u00e9sentant une ovalit\u00e9 mod\u00e9r\u00e9e (d\u00e9formation de 5 \u00e0 151 TP3T)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>La technique CIPP s'adapte aux formes irr\u00e9guli\u00e8res<\/li>\n\n\n\n<li>La technique de chemisage n\u00e9cessite un tuyau h\u00f4te circulaire ou des gaines profil\u00e9es sp\u00e9cialis\u00e9es (co\u00fbteuses)<\/li>\n<\/ul>\n\n\n\n<p><strong>4. Conduites sous pression (eau, p\u00e9trole, air)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CIPP fournit une gaine enti\u00e8rement structurelle et r\u00e9sistante \u00e0 la pression (test\u00e9e selon les normes AWWA C210 ou ASTM F1216)<\/li>\n\n\n\n<li>La technique du \u00ab slip-lining \u00bb repose sur l'utilisation d'un coulis pour transmettre la pression \u00e0 la canalisation h\u00f4te<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-when-slip-lining-is-more-cost-effective\">Quand la technique du \u00ab slip-lining \u00bb est plus rentable<\/h3>\n\n\n\n<p><strong>1. Canalisations fortement endommag\u00e9es contenant des d\u00e9bris volumineux ou des pierres<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Les gaines CIPP peuvent \u00eatre perfor\u00e9es par des d\u00e9bris pointus rest\u00e9s dans la canalisation<\/li>\n\n\n\n<li>La technique de chemisage peut tol\u00e9rer la pr\u00e9sence de d\u00e9bris mineurs, \u00e0 condition que le nouveau tuyau puisse \u00eatre ins\u00e9r\u00e9.<\/li>\n<\/ul>\n\n\n\n<p><strong>2. Conduites non circulaires (en forme d'\u0153uf, canaux-caissons, vo\u00fbt\u00e9es)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Les gaines CIPP fabriqu\u00e9es sur mesure pour des formes non circulaires co\u00fbtent 2 \u00e0 3 fois plus cher que celles de forme circulaire<\/li>\n\n\n\n<li>Les gaines de rev\u00eatement en PEHD ou en fibre de verre sont facilement disponibles en profils rectangulaires ou vo\u00fbt\u00e9s<\/li>\n<\/ul>\n\n\n\n<p><strong>3. Tr\u00e8s courtes distances (moins de 300 pieds)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>La technique du \u00ab slip-lining \u00bb n\u00e9cessite moins d'\u00e9quipement sp\u00e9cialis\u00e9 pour les courtes longueurs<\/li>\n\n\n\n<li>Les co\u00fbts de mobilisation li\u00e9s \u00e0 la m\u00e9thode CIPP repr\u00e9sentent la majeure partie des co\u00fbts des projets de courte dur\u00e9e<\/li>\n<\/ul>\n\n\n\n<p><strong>4. Pipes with multiple severe offsets or sags<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CIPP liners cannot bridge large gaps (over 2 inches of offset)<\/li>\n\n\n\n<li>Slip-lining new pipe creates an independent structural line<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-decision-matrix-for-large-diameter-pipe-rehabilitation\">Decision matrix for large-diameter pipe rehabilitation<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Pipe Characteristic<\/th><th>Choose CIPP<\/th><th>Choose Slip-lining<\/th><th>Comments<\/th><\/tr><\/thead><tbody><tr><td>Diameter 36-120 inches<\/td><td>\u2713<\/td><td><\/td><td>CIPP cost advantage increases with diameter<\/td><\/tr><tr><td>Pressure rating required<\/td><td>\u2713<\/td><td><\/td><td>CIPP provides verifiable pressure rating<\/td><\/tr><tr><td>Gravity flow (sewer\/storm)<\/td><td>\u2713<\/td><td><\/td><td>Flow loss critical for gravity systems<\/td><\/tr><tr><td>Multiple lateral connections<\/td><td>\u2713<\/td><td><\/td><td>Lateral reinstatement costs favor CIPP<\/td><\/tr><tr><td>Length over 500 feet<\/td><td>\u2713<\/td><td><\/td><td>Slip-lining insertion pits multiply<\/td><\/tr><tr><td>Severe debris\/rocks<\/td><td><\/td><td>\u2713<\/td><td>Debris risk punctures CIPP liner<\/td><\/tr><tr><td>Non-circular profile<\/td><td><\/td><td>\u2713<\/td><td>Custom non-circular CIPP is expensive<\/td><\/tr><tr><td>Severe offsets (&gt;2 inches)<\/td><td><\/td><td>\u2713<\/td><td>CIPP cannot bridge large gaps<\/td><\/tr><tr><td>Short distance (&lt;300 feet)<\/td><td><\/td><td>\u2713<\/td><td>CIPP mobilization cost inefficient<\/td><\/tr><tr><td>Existing pipe ovality &gt;15%<\/td><td><\/td><td>\u2713<\/td><td>Grout fills irregular annulus<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-real-world-pipeline-rehabilitation-projects-case-studies-from-the-field\">Real-world pipeline rehabilitation projects: Case studies from the field<\/h2>\n\n\n\n<p>Beijing Jinshiwan Pipeline Technology Co., Ltd. has completed numerous pipeline hot tapping, pipeline plug, pipeline stopple, and pipeline modification projects across natural gas, petroleum refining, high-temperature media, and steel coking applications. The following case studies demonstrate trenchless pipe rehabilitation in action.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-case-study-1-high-temperature-thermal-oil-pipeline-hot-tapping-at-ningbo-terminal\">Case Study 1: High-temperature thermal oil pipeline hot tapping at Ningbo Terminal<\/h3>\n\n\n\n<p><strong>Project name:<\/strong>&nbsp;Ningbo Terminal Expansion Phase III EPC Project \u2013 Hot Tapping Labor Subcontract<\/p>\n\n\n\n<p><strong>D\u00e9fi :<\/strong>&nbsp;The project required hot tapping on 12 locations including 6 high-temperature thermal oil openings at 300\u00b0C (572\u00b0F), 2 natural gas trunk line openings on non-standard D717 and D660 pipelines with high-grade thick-wall steel, and 4 vent gas openings. The D717.4 x 19.1mm pipe was X60 material with operating pressure of 6.0-7.0MPa. The D660 x 30mm pipe was L415Q material with design pressure of Class 600 and operating pressure of 6.0-7.0MPa. Both required maintaining future pigging capability.<\/p>\n\n\n\n<p><strong>Solution :<\/strong>&nbsp;The pipeline contractor used custom-fabricated four-way branch fittings with internal flow deflector grids. The fitting reinforcement plates were designed with 50mm wall thickness to handle high pressure and temperature. Specialized welding procedures were developed for thick-wall fittings. Long-stroke hot tapping machines with high-grade steel cutting capabilities were deployed.<\/p>\n\n\n\n<p><strong>Key construction difficulties overcome:<\/strong>&nbsp;Thick-wall fitting welding procedures, long-stroke tapping machine operation, high-grade steel penetration, thick-wall high-pressure tapping.<\/p>\n\n\n\n<p><strong>Project date:<\/strong>&nbsp;October 2024<\/p>\n\n\n\n<p><strong>Localisation :<\/strong>&nbsp;Ningbo, Zhejiang Province<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-case-study-2-natural-gas-pipeline-hot-tapping-at-linyi-shandong\">Case Study 2: Natural gas pipeline hot tapping at Linyi, Shandong<\/h3>\n\n\n\n<p><strong>Project name:<\/strong>&nbsp;China-Russia Eastern Route Linyi Offtake Station \u2013 Linyi Loop Pipeline Interconnection Project<\/p>\n\n\n\n<p><strong>D\u00e9fi :<\/strong>&nbsp;The project required adding a new D508 pipeline connection to an existing D508 live natural gas pipeline. The downstream customer demand could not tolerate shutdown, requiring live hot tapping.<\/p>\n\n\n\n<p><strong>Pipeline parameters:<\/strong>&nbsp;D355.6 x 6.3mm, natural gas medium, operating pressure 3.0MPa<\/p>\n\n\n\n<p><strong>Work scope:<\/strong>&nbsp;DN500 hot tapping and plugging<\/p>\n\n\n\n<p><strong>R\u00e9sultat :<\/strong>&nbsp;Successful hot tapping completed within 2 days (May 22-23, 2024) without interrupting gas supply to downstream customers.<\/p>\n\n\n\n<p><strong>Owner:<\/strong>&nbsp;State Reserve Pipeline (Shandong) Investment Group Co, Ltd.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-case-study-3-high-pressure-natural-gas-pipeline-relocation-at-liling-hunan\">Case Study 3: High-pressure natural gas pipeline relocation at Liling, Hunan<\/h3>\n\n\n\n<p><strong>Project name:<\/strong>&nbsp;Xiangli Branch Line (Yuci Road to Gas Company Section) High-Pressure Gas Pipeline Relocation Project<\/p>\n\n\n\n<p><strong>D\u00e9fi :<\/strong>&nbsp;Approximately 551 meters of new D355.6 x 6.3mm L360M high-frequency welded steel pipe needed to be tied into an existing live 6.3MPa GA1-class natural gas pipeline. The abandoned pipeline section required nitrogen purging and grout filling.<\/p>\n\n\n\n<p><strong>Pipeline parameters:<\/strong>&nbsp;D355.6 x 6.3mm, design pressure 6.3MPa, natural gas medium, L360M material, 3PE enhanced corrosion coating<\/p>\n\n\n\n<p><strong>Work scope:<\/strong>&nbsp;2 hot tapping stopple locations, 4 cold-cut locations, 4 grease barrier installations, and fitting corrosion protection<\/p>\n\n\n\n<p><strong>R\u00e9sultat :<\/strong>&nbsp;Project completed within one month (November 20 to December 20, 2023) with zero safety incidents.<\/p>\n\n\n\n<p><strong>Owner:<\/strong>&nbsp;Hunan Zhongyou Gas Co., Ltd.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-case-study-4-high-temperature-refinery-pipeline-valve-replacement-at-yanan-shaanxi\">Case Study 4: High-temperature refinery pipeline valve replacement at Yanan, Shaanxi<\/h3>\n\n\n\n<p><strong>Project name:<\/strong>&nbsp;Yanan Refinery Unit 2 Overhead Oil-Air Cooler Inlet Valve Online Replacement<\/p>\n\n\n\n<p><strong>D\u00e9fi :<\/strong>&nbsp;A 273mm diameter gasoline pipeline operating at 120\u00b0C and 4.0MPa required valve replacement without shutdown. The construction space was extremely confined, and equipment lifting was very difficult.<\/p>\n\n\n\n<p><strong>Pipeline parameters:<\/strong>&nbsp;D273mm, gasoline medium, 120\u00b0C operating temperature, 4.0MPa design pressure<\/p>\n\n\n\n<p><strong>Work scope:<\/strong>&nbsp;Single block on D273 pipeline<\/p>\n\n\n\n<p><strong>R\u00e9sultat :<\/strong>&nbsp;Despite high temperature, confined space, and difficult lifting conditions, the project team overcame all challenges and successfully completed the valve replacement, earning high praise from the refinery owner.<\/p>\n\n\n\n<p><strong>Project date:<\/strong>&nbsp;January 2025<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-case-study-5-large-diameter-steel-coking-gas-pipeline-hot-tapping-at-inner-mongolia\">Case Study 5: Large-diameter steel coking gas pipeline hot tapping at Inner Mongolia<\/h3>\n\n\n\n<p><strong>Project name:<\/strong>&nbsp;Inner Mongolia Qinghua Group Qinghua Coal Chemical Co., Ltd. Hot Tapping Service Contract<\/p>\n\n\n\n<p><strong>D\u00e9fi :<\/strong>&nbsp;A DN1600 gas pipeline operating at very low pressure (5Kpa) required hot tapping and stopple. The extremely large diameter combined with low pressure presented unique sealing challenges.<\/p>\n\n\n\n<p><strong>Pipeline parameters:<\/strong>&nbsp;DN1600, coal gas medium, 5Kpa operating pressure<\/p>\n\n\n\n<p><strong>Work scope:<\/strong>&nbsp;Single block on DN1600 pipeline<\/p>\n\n\n\n<p><strong>R\u00e9sultat :<\/strong>&nbsp;Successful hot tapping and stopple completed on one of the largest diameter low-pressure gas pipelines in the region.<\/p>\n\n\n\n<p><strong>Project date:<\/strong>&nbsp;February 2024<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-case-study-6-china-coal-ordos-circulating-water-pipeline-relocation\">Case Study 6: China Coal Ordos circulating water pipeline relocation<\/h3>\n\n\n\n<p><strong>Project name:<\/strong>&nbsp;China Coal Ordos Energy and Chemical Co., Ltd. Gasification Workshop Circulating Water Pipeline Relocation<\/p>\n\n\n\n<p><strong>D\u00e9fi :<\/strong>&nbsp;A DN1200 circulating water pipeline required relocation involving both hot tapping and stopple at four locations.<\/p>\n\n\n\n<p><strong>Pipeline parameters:<\/strong>&nbsp;DN1200, water medium, 0.1Mpa operating pressure<\/p>\n\n\n\n<p><strong>Work scope:<\/strong>&nbsp;Four stopple locations on DN1200 pipeline<\/p>\n\n\n\n<p><strong>R\u00e9sultat :<\/strong>&nbsp;Circulating water flow was maintained throughout the relocation with minimal disruption to gasification operations.<\/p>\n\n\n\n<p><strong>Project date:<\/strong>&nbsp;September 2019<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-material-supplier-and-equipment-manufacturer-considerations\">Material supplier and equipment manufacturer considerations<\/h2>\n\n\n\n<p>The quality of materials and equipment significantly affects installed cost and long-term performance. Working with established material suppliers and equipment manufacturer partners ensures consistent results.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-key-suppliers-and-their-impact-on-cipp-cost-effectiveness\">Key suppliers and their impact on CIPP cost-effectiveness<\/h3>\n\n\n\n<p>Leading CIPP material suppliers offer:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pre-impregnated liners with factory-controlled resin content (reduces field waste by 15-20%)<\/li>\n\n\n\n<li>UV-cured systems that cut curing time by 50% for large diameters<\/li>\n\n\n\n<li>Custom liner thickness designs based on host pipe condition (avoids over-engineering)<\/li>\n<\/ul>\n\n\n\n<p><strong>Cost impact of choosing the right equipment manufacturer:<\/strong>&nbsp;A high-quality curing boiler reduces fuel consumption by 30% and curing time by 15-20% compared to rental fleet units.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-slip-lining-material-and-equipment-considerations\">Slip-lining material and equipment considerations<\/h3>\n\n\n\n<p>For slip-lining projects, working with a reliable Material Supplier of HDPE or fiberglass pipe ensures:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Consistent wall thickness and dimensional tolerances (\u00b10.5% vs. \u00b12% for lower-grade products)<\/li>\n\n\n\n<li>Proper fusion equipment calibration (joint integrity is critical for pressure applications)<\/li>\n\n\n\n<li>Grout materials matched to annular space volume (reduces waste by 10-15%)<\/li>\n<\/ul>\n\n\n\n<p><strong>Equipment manufacturer recommendation for slip-lining:<\/strong>&nbsp;Butt-fusion machines provide data logging of fusion parameters (temperature, pressure, cooling time), which is increasingly required by specifications for large-diameter pressure pipelines.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-frequently-asked-questions-about-cipp-vs-slip-lining-cost-effectiveness\">Frequently asked questions about CIPP vs. slip-lining cost-effectiveness<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-q-which-method-has-lower-long-term-maintenance-costs\">Q: Which method has lower long-term maintenance costs?<\/h3>\n\n\n\n<p>A: CIPP typically has lower long-term maintenance costs because the seamless, jointless liner eliminates leak paths and root intrusion points. Slip-lined pipes have annular space that, despite grouting, can develop voids over time due to settlement or thermal cycling. Industry follow-up inspections show CIPP requires fewer maintenance interventions per mile than slip-lining.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-q-how-does-pipe-diameter-affect-the-cost-crossover-point\">Q: How does pipe diameter affect the cost crossover point?<\/h3>\n\n\n\n<p>A: For diameters under 24 inches, slip-lining often costs less because smaller HDPE pipe is inexpensive and insertion pits are smaller. Above 36 inches, CIPP becomes increasingly cost-competitive. At 60 inches, CIPP is typically 10-15% less expensive than slip-lining for total installed cost including downtime. At 96 inches, the advantage grows to 20-25% due to slip-lining grout volume and pit excavation costs.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-q-can-cipp-or-slip-lining-be-used-for-oil-or-gas-pipelines\">Q: Can CIPP or slip-lining be used for oil or gas pipelines?<\/h3>\n\n\n\n<p>A: Yes, both methods are approved for oil and gas pipelines with appropriate material certifications. CIPP requires epoxy or vinyl ester resins rated for hydrocarbon exposure (polyester is not acceptable). Slip-lining with HDPE is widely used for oil and gas gathering lines and produced water lines. However, hot tapping and pipeline modification requirements for live hydrocarbon lines add significant safety and regulatory costs to both methods. Always consult a qualified pipeline contractor experienced with hazardous service conditions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-q-what-is-the-role-of-hot-tapping-in-pipeline-rehabilitation\">Q: What is the role of hot tapping in pipeline rehabilitation?<\/h3>\n\n\n\n<p>A: Hot tapping (connecting new branches to a live pipeline without shutdown) is often required during rehabilitation to maintain service connections. For CIPP projects, hot tapping is performed after liner installation to reconnect lateral lines. For slip-lining, hot tapping may be needed at multiple insertion pit locations. A specialized hot tapping service provider using proper pipeline tapping equipment ensures safety and compliance with applicable regulations.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-q-how-do-i-verify-a-contractor-qualifications-for-large-diameter-projects\">Q: How do I verify a contractor qualifications for large-diameter projects?<\/h3>\n\n\n\n<p>A: Ask potential contractors for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Completed project list of pipes 36 inches and larger (minimum 5 projects)<\/li>\n\n\n\n<li>References from material suppliers and equipment manufacturers they use<\/li>\n\n\n\n<li>Quality control documentation (ASTM or ISO standards)<\/li>\n\n\n\n<li>Insurance and bonding capacity matching project size<\/li>\n\n\n\n<li>Experience with pipeline plug and pipeline stopple systems for large diameters<\/li>\n\n\n\n<li>Certifications from industry associations<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-how-to-calculate-total-cost-effectiveness-for-your-specific-project\">How to calculate total cost-effectiveness for your specific project<\/h2>\n\n\n\n<p>Follow this five-step framework to determine which method delivers superior value for your large-diameter pipe rehabilitation.<\/p>\n\n\n\n<p><strong>Step 1: Gather baseline data<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pipe diameter, material, and length<\/li>\n\n\n\n<li>Current flow rate and pressure (if pressure pipe)<\/li>\n\n\n\n<li>Pipe condition assessment (CCTV inspection with laser profiling)<\/li>\n\n\n\n<li>Number and location of lateral connections<\/li>\n\n\n\n<li>Accessibility for insertion pits (slip-lining) or liner insertion points (CIPP)<\/li>\n<\/ul>\n\n\n\n<p><strong>Step 2: Calculate direct rehabilitation costs<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Obtain quotes from at least two qualified CIPP contractors and two slip-lining contractors<\/li>\n\n\n\n<li>Request line-item pricing for materials, labor, equipment, grout (slip-lining), bypass pumping, and restoration<\/li>\n\n\n\n<li>Add 15% contingency for both methods (large-diameter projects have higher uncertainty)<\/li>\n<\/ul>\n\n\n\n<p><strong>Step 3: Quantify downtime costs<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Daily cost of pipeline outage (lost revenue, purchased alternative supply, social costs)<\/li>\n\n\n\n<li>Multiply by estimated shutdown duration for each method (use the ranges provided in this article)<\/li>\n\n\n\n<li>Add bypass pumping and temporary pipeline plug rental costs<\/li>\n<\/ul>\n\n\n\n<p><strong>Step 4: Calculate 50-year lifecycle costs<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Maintenance frequency and cost<\/li>\n\n\n\n<li>Pumping energy cost increase (if flow capacity is reduced)<\/li>\n\n\n\n<li>Future rehabilitation likelihood (CIPP can be re-lined; slip-lined pipes require excavation for re-rehabilitation)<\/li>\n<\/ul>\n\n\n\n<p><strong>Step 5: Factor non-monetary considerations<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Public disruption from multiple insertion pits (slip-lining)<\/li>\n\n\n\n<li>Traffic impact duration (CIPP shorter timeline often reduces community impact)<\/li>\n\n\n\n<li>Regulatory approval timeline (some agencies have preferred methods)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-maintenance-and-restoration-considerations-after-rehabilitation\">Maintenance and restoration considerations after rehabilitation<\/h2>\n\n\n\n<p>Both methods require ongoing maintenance and eventual restoration planning, though the frequency and nature differ significantly.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-post-cipp-maintenance-requirements\">Post-CIPP maintenance requirements<\/h3>\n\n\n\n<p>CIPP liners require minimal maintenance due to their jointless, corrosion-resistant nature. Standard maintenance includes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Annual CCTV inspection (recommended for first 5 years, then every 3-5 years)<\/li>\n\n\n\n<li>Hydrostatic pressure testing every 5 years for pressure pipelines<\/li>\n\n\n\n<li>Lateral connection inspection (robotic cameras)<\/li>\n<\/ul>\n\n\n\n<p><strong>Restoration when CIPP reaches end of life (50+ years):<\/strong>&nbsp;The existing liner can be removed via mechanical cutting or burst with a new CIPP liner installed inside\u2014no excavation required. This creates a true trenchless forever solution.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-post-slip-lining-maintenance-requirements\">Post-slip-lining maintenance requirements<\/h3>\n\n\n\n<p>Slip-lined pipes require more frequent attention:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Annual grout void detection (ground-penetrating radar or acoustic monitoring)<\/li>\n\n\n\n<li>Annular space re-grouting (typically every 15-20 years as grout shrinks)<\/li>\n\n\n\n<li>Joint inspection for HDPE fusion integrity<\/li>\n\n\n\n<li>Flow monitoring to detect capacity loss from grout debris<\/li>\n<\/ul>\n\n\n\n<p><strong>Restoration at end of life:<\/strong>&nbsp;Removing a slip-lined pipe typically requires excavation or pipe bursting (which is difficult for large diameters with grout-filled annulus). Many utilities accept that slip-lined pipes will require full replacement when the liner fails.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-making-the-right-choice-for-your-large-diameter-pipeline\">Making the right choice for your large-diameter pipeline<\/h2>\n\n\n\n<p>After analyzing industry project data and case studies from natural gas, petroleum refining, high-temperature media, and steel coking applications, the evidence clearly shows that&nbsp;CIPP is more cost-effective than slip-lining for the majority of large-diameter pipe rehabilitation projects, particularly for pressure pipelines, gravity sewers, water transmission mains, and any application where maintaining flow capacity is critical.<\/p>\n\n\n\n<p><strong>Choose CIPP when:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pipe diameter exceeds 36 inches<\/li>\n\n\n\n<li>Flow capacity preservation is important (almost always true)<\/li>\n\n\n\n<li>Multiple lateral connections exist<\/li>\n\n\n\n<li>Downtime costs are significant<\/li>\n\n\n\n<li>Design life of 50+ years is required<\/li>\n<\/ul>\n\n\n\n<p><strong>Choose slip-lining when:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pipe has severe debris or sharp protrusions<\/li>\n\n\n\n<li>Non-circular profile cannot accommodate CIPP economically<\/li>\n\n\n\n<li>Very short project length (under 300 feet)<\/li>\n\n\n\n<li>Host pipe has offsets over 2 inches that cannot be repaired<\/li>\n<\/ul>\n\n\n\n<p>For large-diameter pipeline owners, working with an experienced trenchless pipe rehabilitation contractor who offers both methods ensures unbiased recommendations. The right contractor will perform a thorough condition assessment, provide transparent cost comparisons including downtime and lifecycle costs, and execute the chosen method safely and efficiently.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-about-beijing-jinshiwan-pipeline-technology-co-ltd-your-pipeline-rehabilitation-partner\">About Beijing Jinshiwan Pipeline Technology Co., Ltd. \u2013 Your Pipeline Rehabilitation Partner<\/h2>\n\n\n\n<p>Beijing Jinshiwan Pipeline Technology Co., Ltd. (JSW) has established itself as a trusted name in the pipeline rehabilitation and hot tapping industry, serving natural gas, petroleum refining, chemical, steel coking, and industrial facilities across China. As both a service provider and an equipment manufacturer, Jinshiwan brings vertical integration that benefits clients through reduced costs, faster project delivery, and single-source accountability.<\/p>\n\n\n\n<p><strong>Company background:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Founded: 1998<\/li>\n\n\n\n<li>Headquarters: Beijing, China<\/li>\n\n\n\n<li>Service coverage: Nationwide across all major industrial regions<\/li>\n\n\n\n<li>Core expertise: Hot tapping, pipeline plug, pipeline stopple, pipeline tapping, pipeline modification, and pipeline maintenance<\/li>\n<\/ul>\n\n\n\n<p><strong>Integrated capabilities:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Engineering and consultation<\/strong>\u00a0\u2013 Free initial assessment of your large-diameter pipe rehabilitation needs with a no-obligation cost comparison between CIPP and slip-lining for your specific project parameters<\/li>\n\n\n\n<li><strong>Fabrication d'\u00e9quipements<\/strong>\u00a0\u2013 Jinshiwan manufactures its own pipeline plug, pipeline stopple, hot tapping, and pipeline tapping equipment, eliminating rental costs and ensuring equipment availability when you need it<\/li>\n\n\n\n<li><strong>Installation services<\/strong>\u00a0\u2013 Fully insured, certified installation crews experienced with pipes across all diameters for water, oil, air, natural gas, and wastewater applications<\/li>\n\n\n\n<li><strong>Maintenance and restoration<\/strong>\u00a0\u2013 Ongoing support including annual inspections, pressure testing, and emergency response<\/li>\n<\/ul>\n\n\n\n<p><strong>Selected project track record (natural gas pipelines):<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Localisation<\/th><th>Project<\/th><th>Diam\u00e8tre<\/th><th>Pressure<\/th><th>Date<\/th><\/tr><\/thead><tbody><tr><td>Langfang<\/td><td>Yongbei East\/West Line and Suyong Lines<\/td><td>D219, D529, D377<\/td><td>4.0MPa<\/td><td>2024<\/td><\/tr><tr><td>Baoding<\/td><td>Rongcheng Xin`an Gas EA1 West Section | DN300, DN200 | 1.6MPa | 2024 |<\/td><td><\/td><td><\/td><td><\/td><\/tr><tr><td>Xiong`an | Gas Phase II West Extension | 508mm | 1.3MPa | 2024 |<\/td><td><\/td><td><\/td><td><\/td><td><\/td><\/tr><tr><td>Linyi<\/td><td>China-Russia Eastern Route Interconnection<\/td><td>D355.6<\/td><td>3.0MPa<\/td><td>2024<\/td><\/tr><tr><td>Liling<\/td><td>Xiangli Branch Line Relocation<\/td><td>D355.6<\/td><td>6.3MPa (design)<\/td><td>2023<\/td><\/tr><tr><td>Nanjing<\/td><td>Yunmi Road DN600 Gas Relocation<\/td><td>DN600<\/td><td>3.0MPa<\/td><td>2023<\/td><\/tr><tr><td>Lanzhou<\/td><td>Honggu Xin`an Gas Pipeline | DN400, DN50 | 2.0MPa | 2023 |<\/td><td><\/td><td><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Selected project track record (high-temperature and petroleum refining):<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Localisation<\/th><th>Project<\/th><th>Moyen<\/th><th>Temp\u00e9rature<\/th><th>Pressure<\/th><th>Date<\/th><\/tr><\/thead><tbody><tr><td>Yanan<\/td><td>Refinery Overhead Valve Replacement<\/td><td>Gasoline<\/td><td>120\u00b0C<\/td><td>4.0MPa<\/td><td>2025<\/td><\/tr><tr><td>Ningbo<\/td><td>Terminal Expansion Thermal Oil<\/td><td>Thermal Oil<\/td><td>300\u00b0C<\/td><td>4.0MPa<\/td><td>2024<\/td><\/tr><tr><td>Nanjing<\/td><td>BASF Hot Tapping<\/td><td>Steam<\/td><td>160\u00b0C<\/td><td>0.4MPa<\/td><td>2022<\/td><\/tr><tr><td>Guangzhou<\/td><td>Refinery Heat Exchanger Repair<\/td><td>Gasoline<\/td><td>120\u00b0C<\/td><td>1.5MPa<\/td><td>2021<\/td><\/tr><tr><td>Tianjin<\/td><td>Sinopec Ethylene Plant<\/td><td>Gasoline<\/td><td>250\u00b0C<\/td><td>0.59MPa<\/td><td>2020<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Selected project track record (steel coking and industrial):<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Localisation<\/th><th>Project<\/th><th>Diam\u00e8tre<\/th><th>Moyen<\/th><th>Pressure<\/th><th>Date<\/th><\/tr><\/thead><tbody><tr><td>Inner Mongolia<\/td><td>Qinghua Coal Chemical<\/td><td>DN1600<\/td><td>Coal Gas<\/td><td>5Kpa<\/td><td>2024<\/td><\/tr><tr><td>Qingdao<\/td><td>Power Plant Circulating Water<\/td><td>DN1020<\/td><td>Circulating Water<\/td><td>0.25MPa<\/td><td>2023<\/td><\/tr><tr><td>Dingzhou<\/td><td>Blast Furnace Air Pipeline<\/td><td>DN1400<\/td><td>Compressed Air<\/td><td>5Kpa<\/td><td>2020<\/td><\/tr><tr><td>Xinjiang<\/td><td>Jin Yuan Energy Gas Pipeline<\/td><td>DN1300<\/td><td>Coke Oven Gas<\/td><td>4Kpa<\/td><td>2020<\/td><\/tr><tr><td>China Coal<\/td><td>Ordos Circulating Water<\/td><td>DN1200<\/td><td>Water<\/td><td>0.1MPa<\/td><td>2019<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Why clients choose Jinshiwan for large-diameter pipeline projects:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Transparent, fixed-price quoting with no hidden fees for bypass pumping, traffic control, or restoration<\/li>\n\n\n\n<li>In-house equipment manufacturer means you never pay third-party rental markups on pipeline plug, pipeline stopple, or hot tapping equipment<\/li>\n\n\n\n<li>10-year warranty on all installation workmanship<\/li>\n\n\n\n<li>24\/7 technical support during active construction phases<\/li>\n\n\n\n<li>Over 50 large-diameter and high-temperature projects completed in the last 36 months<\/li>\n<\/ul>\n\n\n\n<p><strong>Service guarantees:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fixed-price contracts with defined contingency allowances (no surprise billing)<\/li>\n\n\n\n<li>24-hour emergency response for pipeline plug and pipeline stopple deployments<\/li>\n\n\n\n<li>Free annual inspection for the first 5 years following project completion<\/li>\n<\/ul>\n\n\n\n<p><strong>Industries served:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Natural gas transmission and distribution<\/li>\n\n\n\n<li>Petroleum refining and petrochemical<\/li>\n\n\n\n<li>Steel manufacturing and coking<\/li>\n\n\n\n<li>Power generation (circulating water systems)<\/li>\n\n\n\n<li>Industrial process piping<\/li>\n<\/ul>\n\n\n\n<p><em>JSW&nbsp;\u2013 Engineered for the long run.<\/em><\/p>\n\n\n\n<p><strong>Auteur :<\/strong>&nbsp;Li Chao, Engineering Department Manager, Beijing Jinshiwan Pipeline Technology Co., Ltd. With over a decade of experience managing hot tapping, pipeline plug, pipeline stopple, and pipeline modification projects across natural gas, petroleum refining, high-temperature media, and steel coking applications. Has led more than 50 successful pipeline interventions including high-temperature thermal oil (300\u00b0C) and ultra-large diameter (DN1600) low-pressure gas pipeline operations.<\/p>\n\n\n\n<p><strong>Last updated:<\/strong>&nbsp;April 2026<\/p>","protected":false},"excerpt":{"rendered":"<p>For large-diameter pipes (typically 36 inches and above), CIPP is generally more cost-effective than slip-lining when considering total project costs, operational disruption, and long-term performance, though slip-lining offers advantages in specific scenarios involving severe structural degradation or non-circular profiles. This comprehensive guide compares both trenchless pipe rehabilitation methods across material costs, installation requirements, downtime, durability, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4529,"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":[701],"tags":[705,703,229,702,436,540,386,505,704,381],"class_list":["post-5437","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-trenchless-technology","tag-cipp-cost-per-linear-foot","tag-cipp-vs-slip-lining-2","tag-hot-tapping","tag-large-diameter-pipe-rehabilitation","tag-pipeline-modification","tag-pipeline-plug","tag-pipeline-stopple","tag-pipeline-tapping","tag-slip-lining-hdpe-cost","tag-trenchless-pipe-rehabilitation-cost"],"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>CIPP vs Slip-lining: Large-Diameter Pipe Cost-Effectiveness Guide | JSW<\/title>\n<meta name=\"description\" content=\"Compare CIPP vs slip-lining for large-diameter pipes (36-120 inches). 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