TY JOUR TI ANALYSIS OF FOAM DOSING SYSTEMS IN PUMP UNITS OF FIRE VEHICLES: STATUS, PROBLEMS, TECHNICAL SOLUTIONS KW foaming agent dosing systems KW pumping units of fire trucks KW operational characteristics of dosing systems KW equipment and instrumentation of dosing systems JO Problems of risk management in the technosphere AU Pechurin, A.A. AU Presnov, A.I. AU Markova, N.B. PY 2023 IS 2023 PB Saint-Petersburg University of State Fire Service of Emercom of Russia