چكيده به لاتين
With the passage of time and the growth of industrial activities, their risks have also grown. Therefore, in order to reduce the scope or incidence of an accident, the need to implement conventional methods for consequence analysis of process incident is required. The first step in modeling consequence analysis is identifying the relevant hazards by defining scenarios and analyzing them. Each scenario (causing leakage or rupture in a tube or reservoir containing flammable or toxic substances or under pressure) can have several distinct consequences (fire, explosion, toxic gas dispersion) which are these consequences are analyzed by models of releasing and distributing materials in the environment, fire and explosion model and the impact of these consequences on the current population and existing facilities. PHAST is one of the most suitable and famous software which is prepared in order to modeling of process incident due to toxic gas dispersion, fire and explosion.
In this thesis, after examining the various consequences and their effects in various industrial units, the consequences of process incidents are modeled in four gas compressor station Ardebil, Chalvand, Arsanjan, Khavaran in the PHAST software and in order to find the worst case, effects of wind speed, pressure, temperature and hole leak diameter changes are studied.
The final results for fire zone indicate that when wind speed is increased, the gas dispersion is decreased but radiation level in jet fire is increased and when pressure is increased the jet fir distance & radiation level and LFL gas dispersion & cloud height are increased. The temperature seems not to have much effect on radiation level and LFL gas dispersion but cooler fluids tend to disperse more. When the hole diameter is increased the jet fir distance & radiation level and LFL gas dispersion & cloud height are increased. Also in gas phase, release direction is more important and dispersion is increased if a barrier exists.
