International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

In this this research work, the results of investigation corrosion condition of the steel pipe system for the heated water transportation and distribution after long years of exploitation are presented. The analysis was performed on the pipe segments after their removing i.e. cutting. Thirty segments were taken for inspection. The outer and inner surface of the pipes was inspected. Plan for inspection was prepared basing of the literature revue and personal experience. All specimens were visually inspected. For the investigations of pitting corrosion measuring of depth of pits was done. Performed investigations confirmed that general corrosion, uniform and no uniform is represented on the pipe from the outer side. From the inner side are presented different types of pitting: narrow, shallow, and elliptical and corrosion under layer. Performed investigation confirmed that the most dangerous for the piping systems is corrosion on the outer sides of the pipes which their perforation. Measurement of the pits deepness showed that pitting corrosion is not so danger because pits deepness is in the range between 0.18-1.24 mm which is negligible compared with the pipes wall thickness.

In this paper the solution to the inverse problem of hydrodynamics of the viscous incompressible liquid, moving through pipes of the circular cross-section without a free surface, is given. For a given mass flow at one of the outlets of the pipeline system, the required pressure at its inlet is determined. The numerical simulation of the change in liquid velocity in the pipeline system is carried out for the given pressure variation at the inlet of the system.