TY JOUR TI Accounting for Flow Discontinuities While Water Hammers at Engineering Stage of Pressure Pipelines Made of Polymeric Materials KW engineering KW pressure pipelines KW polymeric materials KW water hammer KW flow continuity KW flow discontinuity KW method of characteristics JO Proceedings of Petersburg Transport University AU Kapinos, O.G. AU Tvardovskaya, N.V. PY 2022 IS 19 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"