TY JOUR TI Hydraulic Hits in Penstocks with Above-Ground Laying KW Pressure pipelines KW water hammer KW flow continuity KW design KW operation KW permafrost KW above-ground laying KW steel pipes KW polymer pipes JO Proceedings of Petersburg Transport University AU Kapinos, O.G. AU Tvardovskaya, N.V. PY 2023 IS 20 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"