FIELD: power industry.
SUBSTANCE: in the method of steam and chemical cleaning and passivation of surfaces of metal pipes which is characterized by their purging with water vapour with oxidizer and activators of cleaning process into the water vapour flow during their purging first the reagent is added which emits carbon oxide - water solution of formic acid, then hydrogen and at the end of the process oxygen is added.
EFFECT: improvement of efficiency of cleaning and passivation of internal surfaces of heat exchange pipes due to performing the process in three stages at consecutive dosing in the flow of steam of reagent of the formic acid decayed with release of carbon oxide in the following sequence: formic acid, hydrogen and oxygen.
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