Pipeline walls hydrophobic properties study and their protective coatings used in trenchless technologies

Abstract

Abstract.The results of field and theoretical studies to determine the degree of hydrophobicity of the inner pipe walls in static and dynamic conditions are reported. The water drops spreading nature in contact with the horizontal and concave surface of different materials with the definition of contact angles is determined. The flow pattern formed when the critical mass of liquid miniflow is reached on an inclined surface in the form of an open trough was studied. The geometric parameters of the frontal and coaxial miniflow projections were determined, its dimensions and hydraulic characteristics were studied. The trial stand design for the protective coatings hydrophobic properties study was presented and described and method of evaluation of the pipeline work surfaces hydrophobic properties by applying the relative hydrophobicity ratio. Calculation formulas of the relative hydrophobicity ratio for work surfaces were presented. The relationships of hydrophobicity of various coatings used in the trenchless technologies to relative roughness coefficients were established.

Experimental studies of the transporting capacity of the pipe textured relief trays

“…The pipelines of water discharge systems, which are subject to trenchless repair by applying various types of internal protective coatings in the form of thin-walled sleeves (shells), are characterized by a number of parameters, which first of all include their strength and hydraulic characteristics [1,2]. When using new composite and polymer materials in the repair of pipelines in recent years, a special attention has been paid to the hydrophobic parameters, which can also be attributed to the hydraulic characteristics of pipes and their protective coatings [3].…”