{"id":12974,"date":"2025-11-05T18:57:28","date_gmt":"2025-11-05T18:57:28","guid":{"rendered":"https:\/\/ipsenglobal.com\/?post_type=knowledge-center&p=12974"},"modified":"2026-03-11T17:15:13","modified_gmt":"2026-03-11T17:15:13","slug":"ask-the-expert-when-leak-up-rates-and-part-discoloration-dont-align","status":"publish","type":"knowledge-center","link":"https:\/\/ipsenglobal.com\/fr\/knowledge-center\/ask-the-expert-when-leak-up-rates-and-part-discoloration-dont-align\/","title":{"rendered":"Demandez \u00e0 un expert : Quand les taux de fuite et la d\u00e9coloration des pi\u00e8ces ne concordent pas"},"content":{"rendered":"

Par Matt Clinite, directeur des ventes<\/h4>\n\n\n\n
\n\n\n\n

Taux de fuite<\/a> peut \u00eatre trompeuse. Il se peut que vous voyiez des pi\u00e8ces propres et brillantes sortir de votre four, m\u00eame si le taux de fuite sugg\u00e8re un probl\u00e8me. D'autres fois, vous pouvez remarquer une d\u00e9coloration des pi\u00e8ces sans aucun signe d'augmentation du taux de fuite.<\/p>\n\n\n\n

Il s'agit de situations courantes qui peuvent entra\u00eener une certaine confusion et un d\u00e9pannage suppl\u00e9mentaire. Examinons de plus pr\u00e8s ces deux sc\u00e9narios et quelques m\u00e9thodes pratiques pour identifier le probl\u00e8me avant de passer des heures \u00e0 diagnostiquer le mauvais probl\u00e8me.<\/p>\n\n\n\n

Pi\u00e8ces propres, taux de fuite suspect<\/h3>\n\n\n\n

L'une des raisons les plus courantes pour lesquelles vous obtenez une pi\u00e8ce propre, malgr\u00e9 un taux de fuite plus \u00e9lev\u00e9 que pr\u00e9vu, peut \u00eatre un joint us\u00e9 dans l'une des soupapes de remplissage ou de pression partielle.<\/p>\n\n\n\n

Ces types de fuites permettent au gaz inerte de p\u00e9n\u00e9trer dans la chambre, de sorte qu'il n'y a pas d'interaction chimique entre le gaz qui fuit et les pi\u00e8ces. Cependant, une fuite lente de gaz inerte peut toujours causer des probl\u00e8mes au cours d'une recette qui n\u00e9cessite un faible vide. Par exemple, une fuite de gaz de traitement peut emp\u00eacher le four d'atteindre le niveau de vide n\u00e9cessaire pour d\u00e9clencher la vanne principale de la pompe de diffusion.<\/p>\n\n\n\n

La meilleure fa\u00e7on de v\u00e9rifier cette th\u00e9orie est d'isoler l'alimentation en gaz en utilisant la vanne manuelle pour fermer les conduites de gaz du four, de mettre le four sous vide et de v\u00e9rifier s'il y a toujours une anomalie au niveau du taux de fuite.<\/p>\n\n\n\n

Si le taux de fuite redevient normal lorsque toutes les vannes manuelles sont ferm\u00e9es, cela signifie probablement que du gaz s'\u00e9chappe de la vanne de remplissage ou du sol\u00e9no\u00efde de pression partielle, ce qui indique que la vanne doit \u00eatre remplac\u00e9e.<\/p>\n\n\n\n

Comme toujours, suivez les instructions du fabricant pour remplacer une vanne. Si vous remplacez un robinet \u00e0 papillon, profitez de l'offre d'Ipsen Proc\u00e9dures recommand\u00e9es pour l'installation d'une vanne papillon<\/a>.<\/p>\n\n\n\n

N'oubliez pas que les taux de fuite sont cumulatifs. De nombreuses sources diff\u00e9rentes peuvent contribuer \u00e0 un taux de fuite \u00e9lev\u00e9. Ne vous arr\u00eatez donc pas une fois que vous avez trouv\u00e9 une valve qui fuit - soyez minutieux et assurez-vous de d\u00e9tecter toutes les fuites lorsque vous testez l'ensemble du syst\u00e8me.<\/p>\n\n\n\n

Pi\u00e8ces d\u00e9color\u00e9es, taux de fuite constant<\/h3>\n\n\n\n

Des pi\u00e8ces d\u00e9color\u00e9es sont le signe qu'un gaz ind\u00e9sirable, g\u00e9n\u00e9ralement de l'air atmosph\u00e9rique, a p\u00e9n\u00e9tr\u00e9 dans le four au cours du traitement. Mais comment cela peut-il se produire alors qu'il n'y a pas d'alerte \u00e0 une augmentation du taux de fuite ?<\/p>\n\n\n\n

La r\u00e9ponse est souvent une fuite ou une incursion d'air dans votre r\u00e9servoir de gaz de traitement ou dans les conduites de service de gaz.<\/p>\n\n\n\n

De l'air peut parfois s'infiltrer dans le r\u00e9servoir ou les conduites lors d'un remplissage, ou en raison de la dilatation et de la contraction naturelles des conduites de service dues aux changements de temp\u00e9rature.<\/p>\n\n\n\n

Il peut sembler contre-intuitif que des conduites de gaz sous pression puissent laisser passer l'air ambiant, mais un ph\u00e9nom\u00e8ne physique, appel\u00e9 le Effet Venturi<\/strong> peut entra\u00eener l'aspiration de l'air atmosph\u00e9rique dans la conduite, ce qui d\u00e9place le gaz de traitement lorsqu'il s'\u00e9coule.<\/p>\n\n\n\n

Avant de supposer que de l'air s'est infiltr\u00e9 dans le r\u00e9servoir de r\u00e9serve de gaz de traitement, assurez-vous qu'il n'y a pas de fuites le long des conduites de gaz de traitement \u00e0 l'aide d'un test de bulles. Veillez \u00e0 porter une attention particuli\u00e8re \u00e0 chaque raccord et \u00e0 chaque coude.<\/p>\n\n\n\n

\"Leaky<\/figure>\n\n\n\n

Si vous d\u00e9couvrez une fuite, quelle qu'en soit la quantit\u00e9, suivez tous les protocoles de s\u00e9curit\u00e9 relatifs aux gaz de proc\u00e9d\u00e9, colmatez la fuite (aussi petite soit-elle) et signalez-la \u00e0 votre point de contact en mati\u00e8re de s\u00e9curit\u00e9.<\/strong><\/p>\n\n\n\n

\n \n Pour en savoir plus sur la s\u00e9curit\u00e9 des gaz de process, cliquez ici. <\/a>\n <\/section>\n\n\n\n

Apr\u00e8s une inspection approfondie, si aucune fuite n'est d\u00e9couverte dans les conduites de gaz de traitement entre votre fourneau et le r\u00e9servoir, il peut \u00eatre conseill\u00e9 de demander \u00e0 votre fournisseur de gaz de traitement de proc\u00e9der \u00e0 une inspection de ses conduites de gaz de traitement. test\u00e9 pour le point de ros\u00e9e<\/a> pour d\u00e9tecter toute pr\u00e9sence d'humidit\u00e9.<\/p>\n\n\n\n

Conseil : <\/strong>Pour \u00e9viter de rencontrer des poches d'air dans vos conduites de traitement apr\u00e8s un remplissage de r\u00e9servoir de gaz de traitement ou une intervention sur une conduite de gaz, remplissez votre four et pompez-le une ou deux fois pour vous assurer que tout l'air ind\u00e9sirable est \u00e9vacu\u00e9 du syst\u00e8me et que toutes les conduites menant \u00e0 votre four sont correctement charg\u00e9es avec uniquement du gaz de traitement. Si les conduites de traitement entre votre four et votre r\u00e9servoir sont particuli\u00e8rement longues, vous devrez peut-\u00eatre r\u00e9p\u00e9ter ce cycle plus de deux fois.<\/p>\n\n\n\n

\n\n\n\n

Pour d'autres conseils utiles, consultez notre Page \"Demandez \u00e0 l'expert<\/a>.<\/p>\n\n\n\n

Vous avez une question technique concernant le traitement thermique ou le fonctionnement et l'entretien des fours \u00e0 vide ?<\/h5>\n\n\n\n
<\/div>\n\n\n\n
\n \n Contacter un expert Ipsen <\/a>\n <\/section>","protected":false},"excerpt":{"rendered":"

Par Matt Clinite, directeur des ventes Les taux de fuite peuvent \u00eatre trompeurs. Vous pouvez voir des pi\u00e8ces propres et brillantes sortir de votre four, m\u00eame si le taux de fuite sugg\u00e8re un probl\u00e8me. D'autres<\/p>","protected":false},"author":7,"featured_media":0,"menu_order":0,"template":"","meta":{"_acf_changed":false,"_tec_requires_first_save":true,"_searchwp_excluded":"","_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_tribe_ticket_capacity":"0","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"_EventAllDay":false,"_EventTimezone":"","_EventStartDate":"","_EventEndDate":"","_EventStartDateUTC":"","_EventEndDateUTC":"","_EventShowMap":false,"_EventShowMapLink":false,"_EventURL":"","_EventCost":"","_EventCostDescription":"","_EventCurrencySymbol":"","_EventCurrencyCode":"","_EventCurrencyPosition":"","_EventDateTimeSeparator":"","_EventTimeRangeSeparator":"","_EventOrganizerID":[],"_EventVenueID":[],"_OrganizerEmail":"","_OrganizerPhone":"","_OrganizerWebsite":"","_VenueAddress":"","_VenueCity":"","_VenueCountry":"","_VenueProvince":"","_VenueState":"","_VenueZip":"","_VenuePhone":"","_VenueURL":"","_VenueStateProvince":"","_VenueLat":"","_VenueLng":"","_VenueShowMap":false,"_VenueShowMapLink":false,"_tribe_blocks_recurrence_rules":"","_tribe_blocks_recurrence_description":"","_tribe_blocks_recurrence_exclusions":"","_ecp_custom_2":"","footnotes":""},"categories":[112],"tags":[],"class_list":["post-12974","knowledge-center","type-knowledge-center","status-publish","hentry","category-ask-the-expert"],"acf":[],"yoast_head":"\nAsk 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