FIELD: chemistry.
SUBSTANCE: circuit assembly is treated with 5÷20% oxyethylidenediphosphonic acid solutions neutralised to pH=2.0÷2.9 with ammonia, or potassium or sodium alkali at temperatures 55÷95°C; once pH reaches its permanent value (that is in line with termination of swallow iron oxide deposit dissolution), circulating concentrate of potassium or sodium alkali or ammonia is introduced into the circuit to ensured the solution pH=8.0÷8.5.
EFFECT: compounds for treatment or deactivation of circuit assembly or separate units used in the given method possess high effectiveness to dissolve iron oxide deposits and fewer corrosion loss of carbon steels.
6 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| SOLUTION FOR CLEANING THERMAL UTILITY EQUIPMENT | 0 |
|
SU1016398A1 |
| STEAM GENERATOR WASHING METHOD | 1999 |
|
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| METHOD OF CHEMICAL DEACTIVATION OF NUCLEAR POWER PLANTS EQUIPMENT | 2007 |
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| METHOD OF CHEMICAL DECONTAMINATION OF NUCLEAR POWER PLANT EQUIPMENT | 2007 |
|
RU2340967C1 |
| METHOD OF CLEANING THE HEAT EXCHANGE SURFACE OF ATOMIC POWER STATION STEAM GENERATOR WITH WATER-COOLED POWER REACTOR (ITS VERSIONS) | 1991 |
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| SCALE REMOVAL METHOD | 2008 |
|
RU2386729C2 |
| PROCESS OF STEAM GENERATOR WASHING | 2002 |
|
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| METHOD OF DETERMINING OPTIMAL PARAMETERS OF DISSOLUTION OF OXIDES OF TRANSITION METALS IN SOLUTIONS, CONTAINING COMPLEXING AGENT | 2012 |
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RU2516274C2 |
| METHOD OF CLEANING METAL SURFACES FROM CORROSION DEPOSITS | 2012 |
|
RU2507312C1 |
