TY JOUR TI RISK ASSESSMENT ACCIDENT PIPELINE ON THE TERRITORY OF PETROL STATION KW Petrol station KW technogenic risk KW technological pipelines KW emergency leakages frequency KW pipeline depressurization JO NATURAL AND MAN-MADE RISKS (PHYSICO-MATHEMATICAL AND APPLIED ASPECTS) AU Medvedeva, O.M. PY 2014 IS 2014 PB Saint-Petersburg University of State Fire Service of Emercom of Russia