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A steam-water-oxygen treatment, passivation, and preservation (SWOT, P, and Pr) of the internal heating surfaces of TPP-110, P-210, and P-210A boilers for the 300-MW power-generating sets have been successfully introduced at the Novocherkassk State Area Power Station (SAPS). The condition of the treated heating surfaces of the boilers while in service or on stand-by was investigated to determine the required periodicity of the SWOT, P, and Pr under the service loads and existing water-chemical regime. Specific results of the investigation are presented.

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