TY JOUR TI APPLICATION OF FOAM MIXERS OF TYPE PS-1 AND THEIR ANALOGUES FOR SUPPLY OF LOW AND MEDIUM EXPENSION FOAM LOCALLY IN FIRE EXTINGUISHING KW foaming agent KW foam mixer PS-1 KW foam of low and medium expansion KW foam extinguishing vehicle KW foam generators GPS-600 KW UKTP «Purga-2» KW UKTP «Blizzard-5» JO Scientific and analytical journal «Vestnik Saint-Petersburg university of State fire service of EMERCOM of Russia» AU Tursenev, S.A. AU Dashkevich, E.I. AU Urakov, A.E. PY 2023 IS 2023 PB Saint-Petersburg University of State Fire Service of Emercom of Russia