{"id":6672,"date":"2023-05-15T14:55:34","date_gmt":"2023-05-15T13:55:34","guid":{"rendered":"https:\/\/gf-eez.com\/?p=6672"},"modified":"2023-10-25T09:41:31","modified_gmt":"2023-10-25T08:41:31","slug":"comment-faire-des-tests-de-pressions-et-de-fuites-dune-installation","status":"publish","type":"post","link":"https:\/\/gf-eez.com\/fr\/comment-faire-des-tests-de-pressions-et-de-fuites-dune-installation\/","title":{"rendered":"M\u00e9thodes de tests de pression"},"content":{"rendered":"\t\t
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Comment r\u00e9aliser des tests de pression et de fuites ?<\/b><\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Voici un aper\u00e7u des diff\u00e9rentes m\u00e9thodes de tests<\/b> existantes, pour la pression<\/b> ou pour les fuites<\/b><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Un certain nombre de normes et de directives internationales et nationales sont disponibles pour les tests d’\u00e9tanch\u00e9it\u00e9 et de pression<\/b>.<\/p>\n

Par cons\u00e9quent, il n’est souvent pas facile de trouver la proc\u00e9dure de test applicable et, par exemple, la pression de test. <\/p>\n

L’objectif d’un <\/span>test de pression<\/b> est :<\/span><\/p>\n

– de s’assurer de la r\u00e9sistance \u00e0 la pression de la canalisation<\/b>
– de d\u00e9montrer l’<\/span>\u00e9tanch\u00e9it\u00e9 du fluide<\/b> test\u00e9.<\/span><\/p>\n

G\u00e9n\u00e9ralement, l’essai de pression est effectu\u00e9 sous forme d’essai de pression d’eau<\/b> et seulement dans des cas exceptionnels (en tenant compte de pr\u00e9cautions sp\u00e9ciales de s\u00e9curit\u00e9) comme un test de pression de gaz avec de l’air ou de l’azote<\/b>.<\/p>\n

La comparaison suivante tente de mettre en \u00e9vidence la diff\u00e9rence entre l’eau et l’air comme moyen d’essai : L’eau est un milieu incompressible, c’est-\u00e0-dire qu’en soumettant un tube PVDF<\/b> de 1 m de diam\u00e8tre (d160) \u00e0 une pression de 3 bars, on obtient une \u00e9nergie d’environ 1 joule. En
revanche, l’air est un milieu compressible. Le m\u00eame tuyau avec une pression d’essai de 3 bars stocke d\u00e9j\u00e0 une \u00e9nergie de 5 000 joules. En cas de d\u00e9faillance lors de l’essai de pression, la conduite remplie d’eau ferait un bond de 0,02 m de haut compar\u00e9 au tuyau rempli d’air qui en ferait un 110 m.<\/p>\n

Quel est le comportement des mati\u00e8res en plastiques \u00e0 la rupture de ceux-ci ?<\/b><\/span><\/h3>\n

En cas de rupture, les mat\u00e9riaux thermoplastiques pr\u00e9sentent des comportements diff\u00e9rents. Ainsi, le PE et le PB pr\u00e9sentent un comportement ductile<\/a> (et l’ABS l\u00e9g\u00e8rement inf\u00e9rieur), de sorte qu’une rupture fragile ne peut pas se produire.<\/p>\n

N\u00e9anmoins, les pr\u00e9cautions suivantes doivent \u00eatre prises en compte pendant l’essai de pression. Comme mentionn\u00e9 pr\u00e9c\u00e9demment, l’essai de pression est la premi\u00e8re charge impos\u00e9e \u00e0 la canalisation et a pour but de d\u00e9couvrir tout d\u00e9faut de traitement existant (par exemple, une fusion insuffisante).<\/p>\n

L’\u00e9tanch\u00e9it\u00e9 au gaz<\/b> ne peut pas \u00eatre d\u00e9montr\u00e9e par un test de pression \u00e0 l’eau, m\u00eame avec une augmentation de la pression exerc\u00e9e pendant ledit test !<\/p>\n

Test de pression avec de l’eau ou un fluide similaire incompressible<\/span><\/span><\/strong><\/h3>\n

L’essai sous pression est effectu\u00e9 lorsque les travaux d’installation sont termin\u00e9s et pr\u00e9suppose une canalisation op\u00e9rationnelle ou des sections d’essai op\u00e9rationnelles. La charge de pression d’essai<\/b> est destin\u00e9e \u00e0 fournir la preuve exp\u00e9rimentale de la s\u00e9curit\u00e9 de fonctionnement<\/b>.<\/p>\n

La pression d’essai n’est pas bas\u00e9e sur la pression de fonctionnement, mais sur la capacit\u00e9 de charge de la pression interne<\/b>, bas\u00e9e sur l’\u00e9paisseur de la paroi du tuyau<\/b>.<\/p>\n

L’addendum 2 du DVS 2210-1 constitue la base des informations suivantes. Il remplace enti\u00e8rement les donn\u00e9es du DVS 2210-1. Les modifications sont devenues n\u00e9cessaires parce que la valeur de r\u00e9f\u00e9rence “pression nominale (PN)<\/b>” est de moins en moins utilis\u00e9e pour d\u00e9terminer la pression d’essai (1,5 x PN, ou 1,3 x PN) et est remplac\u00e9e par SDR. En outre, une
surcharge de courte dur\u00e9e, voire une r\u00e9duction de la dur\u00e9e de vie, peut se produire si la valeur de r\u00e9f\u00e9rence de la pression nominale est d\u00e9pass\u00e9e.<\/p>\n

Une surcharge de courte dur\u00e9e ou m\u00eame une r\u00e9duction de la dur\u00e9e de vie peut se produire si la temp\u00e9rature de la paroi du tube TR = 20 \u00b0C<\/b> est d\u00e9pass\u00e9e de plus de 5 \u00b0C au cours de l’essai de pression bas\u00e9 sur la pression nominale.<\/p>\n

Les pressions d’essai sont donc d\u00e9termin\u00e9es en fonction de la DTS et de la temp\u00e9rature de la paroi du tuyau. La valeur 100-h du diagramme de comportement \u00e0 long terme est utilis\u00e9e pour la pression d’essai.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Param\u00e8tres des tests r\u00e9alis\u00e9s<\/u><\/b><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Le tableau suivant pr\u00e9sente les m\u00e9thodes recommand\u00e9es pour effectuer le test de pression.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Pr\u00e9-test<\/u><\/b><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Le pr\u00e9-test sert \u00e0 pr\u00e9parer le syst\u00e8me de tuyauterie pour le test r\u00e9el (test principal). Au cours de l’essai pr\u00e9liminaire, un \u00e9quilibre tension-dilatation li\u00e9 \u00e0 une augmentation du volume se d\u00e9veloppe dans\u00a0le syst\u00e8me de tuyauterie.<\/a><\/p>

Une chute de pression li\u00e9e au mat\u00e9riau se produira, ce qui n\u00e9cessitera un pompage r\u00e9p\u00e9t\u00e9 pour r\u00e9tablir la pression d’essai et, fr\u00e9quemment, un resserrage des boulons de raccordement<\/b> de la bride.<\/p>

\u00a0<\/p>

Les directives pour une baisse de pression li\u00e9e \u00e0 l’expansion dans un tuyau sont les suivantes :<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Test principal<\/u><\/b><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Dans le cadre de l’essai principal, on peut s’attendre \u00e0 une chute de pression<\/b> beaucoup plus faible \u00e0 des temp\u00e9ratures constantes de la paroi des tuyaux, de sorte qu’il n’est pas n\u00e9cessaire de pomper \u00e0 nouveau.\u00a0<\/p>

Les contr\u00f4les peuvent se concentrer principalement sur la d\u00e9tection des fuites au niveau des joints de brides<\/b> et sur les \u00e9ventuels changements de position de la conduite.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Comment r\u00e9aliser des tests de pression et de fuites ? Voici un aper\u00e7u des diff\u00e9rentes m\u00e9thodes de tests existantes, pour la pression ou pour les fuites Un certain nombre de normes et de directives internationales et nationales sont disponibles pour les tests d’\u00e9tanch\u00e9it\u00e9 et de pression. Par cons\u00e9quent, il n’est souvent pas facile de trouver …<\/p>\n","protected":false},"author":124,"featured_media":4993,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"content-type":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[108],"tags":[],"hashtags":[],"class_list":["post-6672","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-expertises","has-thumb","has-featured"],"yoast_head":"\nM\u00e9thodes de tests de pression et de fuites d'une installation - EEZ<\/title>\n<meta name=\"description\" content=\"D\u00e9couvrez comment r\u00e9aliser des tests de pressions et de fuites, v\u00e9rifier la pression des canalisations et l'\u00e9tanch\u00e9it\u00e9 d'une installation\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/gf-eez.com\/fr\/comment-faire-des-tests-de-pressions-et-de-fuites-dune-installation\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"M\u00e9thodes de tests de pression et de fuites d'une installation - 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