METHOD FOR CLEANING AND PROTECTING THE SURFACE OF DEVICES CONTACTING WITH HEATING MEDIUM

Equipment in contact with heating fluids is cleaned and the surfaces of the equipment are protected by first loosening the existing deposits with a 0.5-1.5 kg per cubic meter, pref. 0.7-0.9 kg per cubic meter soln. of a non-ionic detergent, pref. a poly-ethylene-glycol, removing the loosened water-h...

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Bibliographische Detailangaben
Hauptverfasser:	SZABO,ISTVAN,HU, CSATHONE DOBOS,PIROSKA,HU, OLAH,JOZSEF,HU
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25 NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE
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Beschreibung
Zusammenfassung:	Equipment in contact with heating fluids is cleaned and the surfaces of the equipment are protected by first loosening the existing deposits with a 0.5-1.5 kg per cubic meter, pref. 0.7-0.9 kg per cubic meter soln. of a non-ionic detergent, pref. a poly-ethylene-glycol, removing the loosened water-hardness deposits with a soln. of a known descaler, pref. poly-maleic-anhydride having a concn. of 0.02-0.1 kg per cubic meter, a pH below 4.5, pref. below 3.5 and contg. a known inhibitor, and/or treating the surfaces with a 0.1-0.7 kg per cubic meter, pref. 0.3-0.5 kg per cubic meter soln. of an organic sulphonic acid combined with a known inhibitor, and opt. passivating the surfaces with a catalytically activated 0.2-0.5 kg per cubic meter, pref. 0.35-0.45 kg per cubic meter soln. of hydrazine having a pH of at least 10(10-11), by pumping the reagents through the system at a linear flow velocity of at least 0.5 m per sec., pref. 1-2 meter per sec.