TY JOUR TI ANALYSIS OF THE EFFECT OF RELATIVE ROUGHNESS OF PIPELINES ON THE HEAD LOSS KW head loss KW relative roughness KW Reynolds criterion JO Modern Technologies and Scientific and Technological Progress AU Litvincev, Y.I. AU Kozyrev, A.A. AU Zhuko, I.O. PY 2023 IS 2023 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»