%0 Journal Article %T ANALYSIS OF THE EFFECT OF RELATIVE ROUGHNESS OF PIPELINES ON THE HEAD LOSS %A Litvincev, Y.I. %A Kozyrev, A.A. %A Zhuko, I.O. %K head loss, relative roughness, Reynolds criterion %J Modern Technologies and Scientific and Technological Progress %D 2023 %N 2023 %P 1 %I Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»