<\/div>\n
\u00c9ponge humide (low voltage)<\/h2>
La m\u00e9thode \u00e0 \u00e9ponge humide utilise une \u00e9ponge imbib\u00e9e d’eau (\u00e9ventuellement additionn\u00e9e d’un tensioactif afin de r\u00e9duire la tension superficielle) reli\u00e9e \u00e0 un p\u00f4le de l’appareil ; l’autre p\u00f4le est reli\u00e9 au substrat m\u00e9tallique. Lorsque l’\u00e9ponge est d\u00e9plac\u00e9e sur le rev\u00eatement, en pr\u00e9sence d’un pore ou d’une discontinuit\u00e9 l’eau p\u00e9n\u00e8tre jusqu’au substrat en fermant le circuit \u00e9lectrique, et l’instrument \u00e9met un signal d’alarme sonore et visuel. La m\u00e9thode fonctionne \u00e0 basse tension (9 \u00e0 90 V DC), n’endommage pas le rev\u00eatement et s’emploie pour les faibles \u00e9paisseurs (jusqu’\u00e0 500 \u00b5m). Elle est couverte par l’ASTM D5162 m\u00e9thode A et la NACE SP0188 pour les rev\u00eatements minces. <\/p>
Haute tension (spark test)<\/h2>
La m\u00e9thode high voltage holiday detector (HVHD), ou spark test, utilise une tension \u00e9lev\u00e9e (1 000 \u00e0 30 000 V DC) entre une sonde glissante (g\u00e9n\u00e9ralement une brosse en fils d’acier, des faisceaux de cha\u00eenes en cuivre, ou un anneau \u00e0 brosse) et le substrat m\u00e9tallique. Lorsque la sonde franchit un pore ou une discontinuit\u00e9 suffisamment profonde pour atteindre le substrat, une d\u00e9charge \u00e9lectrique visible (\u00e9tincelle) se produit et l’instrument d\u00e9tecte le passage du courant en d\u00e9clenchant l’alarme. Elle est employ\u00e9e pour les rev\u00eatements \u00e9pais (1 \u00e0 25 mm) tels que caoutchouc, plastique et rev\u00eatements de canalisations en FBE (Fusion Bonded Epoxy) ou 3LPE. La tension d’essai se calcule en fonction de l’\u00e9paisseur du rev\u00eatement selon des formules normalis\u00e9es (NACE SP0490, ASTM G62, ISO 29601). <\/p>
Applications gazoducs et ol\u00e9oducs<\/h2>
L’application principale est le contr\u00f4le des rev\u00eatements de canalisations de transport d’hydrocarbures : gazoducs, ol\u00e9oducs, conduites d’eau potable et r\u00e9seaux d’assainissement. Le rev\u00eatement externe (g\u00e9n\u00e9ralement poly\u00e9thyl\u00e8ne tricouche 3LPE, ou FBE, Fusion Bonded Epoxy, ou \u00e9mail bitumineux) est essentiel pour prot\u00e9ger la conduite de la corrosion du sol et de l’action galvanique avec d’autres structures enterr\u00e9es. Chaque m\u00e8tre de tuyauterie est balay\u00e9 au holiday detector avant l’enfouissement afin de localiser et r\u00e9parer tout d\u00e9faut du rev\u00eatement. Pour les conduites \u00e0 haute pression, le respect de la proc\u00e9dure d’essai est prescrit par les normes produit (ISO 21809). <\/p>
Applications industrielles<\/h2>
Outre les canalisations, les holiday detectors sont utilis\u00e9s pour : les r\u00e9servoirs industriels enterr\u00e9s et a\u00e9riens (avec rev\u00eatements internes anticorrosion pour liquides) ; les cuves chimiques et pharmaceutiques \u00e0 rev\u00eatement polym\u00e8re interne ; les rev\u00eatements de sols industriels (r\u00e9sines \u00e9poxy et polyur\u00e9thane) ; les structures m\u00e9talliques de grandes dimensions avec peinture anticorrosion sur le substrat ; le caoutchouc appliqu\u00e9 aux cuves industrielles ; les rev\u00eatements des stations d’\u00e9puration des eaux us\u00e9es. Pour les applications de forte criticit\u00e9, le contr\u00f4le est r\u00e9alis\u00e9 sur 100 % des surfaces avant la mise en service. <\/p>
Normes de r\u00e9f\u00e9rence<\/h2>
Les normes principales sont : NACE SP0188 (Standard Practice, Discontinuity (Holiday) Testing of New Protective Coatings on Conductive Substrates) ; NACE SP0490 (Holiday Detection of Fusion-Bonded Epoxy External Pipeline Coatings) ; ASTM D5162 (low voltage wet sponge) ; ASTM G62 (high voltage) ; ISO 29601 (peintures et vernis, d\u00e9tection des holidays) ; EN 14430 (corrosion, rev\u00eatements pour protection cathodique). L’\u00e9talonnage des instruments s’effectue p\u00e9riodiquement avec des calibrateurs haute tension \u00e9talonn\u00e9s ISO 17025 et des manom\u00e8tres \u00e9lectroniques de haute pr\u00e9cision. <\/p>","protected":false},"excerpt":{"rendered":"
Holiday detectors \u00e0 \u00e9ponge humide et haute tension pour la localisation des pores et discontinuit\u00e9s dans les rev\u00eatements.<\/p>\n","protected":false},"author":157040980,"featured_media":0,"parent":19509,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_wpcom_ai_launchpad_about_page":false,"_wpcom_ai_launchpad_gallery_page":false,"_wpcom_ai_launchpad_contact_page":false,"_wpcom_ai_launchpad_events_page":false,"_wpcom_ai_launchpad_video_page":false,"_wpcom_ai_launchpad_portfolio_piece":false,"footnotes":""},"class_list":["post-20689","page","type-page","status-publish","hentry"],"yoast_head":"\n
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