Method of cleaning hollow conductors of cooled electrical machines

Claim 1

Method for chemical cleaning of water-cooled waveguides of electric machines whose interiors have become corroded which comprises circulating cooling water through waveguides of an electric machine, cooling the water after discharge from the waveguides, and returning the cooled water to the waveguides by a pump which maintains the cooling cycle of the circulating water, and a closable bypass with an interposed ion exchanger connected to the cooling cycle, the combination therewith of closing the bypass and adding a complexing agent into the cooling cycle with the bypass closed to effect removal of at least some of the corrosion products in the waveguides into the circulating water, thereafter opening the bypass to cause the water containing impurities after cleaning the waveguides to flow in contact with the ion exchanger to effect purification of the water, and repeating said operations of closing the bypass and adding a complexing agent, and thereafter opening the bypass to purify the water by contact with the ion exchanger, until sufficient cleaning of the waveguides is effected.