WINDA STUDIO
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保温层下腐蚀（CUI）是什么？

FIG. 01 · CORROSION UNDER INSULATION (CUI)WINDA BEACON · LIBRARYcladdinginsulationsteel wallbore126 o'clockA–A1 WATER INrain · deluge · condensation2 LOW POINTSit runs down and gathers3 HELDthe insulation keeps it wet4 HEATmetal temperature, °C5 FOUNDscreening through insulationSOURCESraindeluge, sprinklerscooling towerscondensationWAYS INfailed joint sealantdamaged claddingnot refitted after workunderside of horizontal runselbowsvessel basespipe supportsnozzles, drain legsoften at 6 o'clockSOAKS UP EASILYmineral woolfibreglasscalcium silicateTAKES UP LESSfoam glassperliteHSE 2011 30–120Cao 2022* 50–175overlap 50–120050100150200* citing NACE SP0198, API RP 583≈0.5 mm/y at 80 °C (HSE, US data)windowsas good as where you cutpulsed eddy currentremaining wall, averagedguided wavelosses from ~10 % of sectionradiographyimages the wallinfraredwet insulation, not corrosionneutron backscatterwet insulation, ~300 m a day
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