Chapter 8

Steam/Air Blowing of Main Steam, Cold Reheat, Hot Reheat and Other Steam Pipe Lines

Abstract

Steam turbine performances are greatly affected by the presence of any debris in main steam and reheat steam. Impingement of suspended particles on turbine blades may lead to blade failure. “Steam” or “compressed air” is used to blow-out various steam pipe lines to remove rust, mill scales, loose pieces of scales, welding slag left over in pipe lines. Two different methods—“continuous blowing” and “puffing,” are used in blowing of steam pipe lines. Disturbance effect, K, of any suspended particulate matter during blowing must be greater than the disturbance effect experienced by the particle under BMCR. Value of K should be about 1.3–1.6 ...

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