Abstract
By a calculation approach it was determined that in cleaning conditions of steel pipes, for exam- ple, 56×3 и 76×3 mm, at discharge in liquid, and all the more in sediments layer 58 mm thick, pressure amplitude in discharge filament is several times higher the breaking point on compression of solid sed- iments (σ >40 MPа). The deciding role in the process of sediments destruction belongs to the pressure pulse in the channel of primary discharge inside the sediments layer. There are three pipe sections typi- cal for electrohydraulic refinement and two fissuring areas before the destruction front. The reasons of regrinding initiation, sediments cracks, primary and opposed destruction front rising and propagation were examined.