TY JOUR TI GAS-DYNAMIC SHOCK IN THE PISTON COMPRESSOR LINES KW GAS-DYNAMIC SHOCK IN THE PISTON COMPRESSOR LINES KW piston compressor KW receiver KW gas-dynamic shock KW acceleration wave KW energy loss KW pressure jump KW gas lines JO Problems of risk management in the technosphere AU Kuzmin, A.A. AU Romanov, N.N. PY 2018 IS 2018 PB Saint-Petersburg University of State Fire Service of Emercom of Russia