TY JOUR TI Calculation of cooling time of above-ground water pipeline with heat insulation under conditions of negative temperatures KW above-ground water pipeline KW internal icing KW freezing time KW mathematical modeling KW quasistationary approximation JO Proceedings of Petersburg Transport University AU Lapshin, V.F. PY 2024 IS 21 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"