In the present study, Computational Fluid Dynamics (CFD) simulations were carried out on a separator subjected to three different fire scenarios: pool fire, jet fire and fireballs. The empirical models applicable to such plants are not developed and conventional radiation models leads to an overestimation of the heat flux and safety distances. Therefore an alternative tool like CFD is used to model the potential equally probable fire scenarios mentioned above in a model oil and gas separator plant. Validations are performed by determining the flame length,maximum flame temperature and its location above pan surface in case of pool fire and comparing them with literature data. It is found that in case of flame length the deviation from literature data is about 10% while this deviation is less than 5% for the maximum flame temperature. For jet fire the average surface temperature is 561 K while this value is 423 K in case of pool fire and 317 K for fireballs. When it comes to the radiative flux, an average value of 29 kW/m2 is found for jet fires while this value is only 14 kW/m2 for pool fire and 23 kW/m2 for fireballs. The thermal loads on the separator vessel due to above fire scenarios are also calculated from which it can be concluded that from safety point of view jet fires are the most critical one. The results obtained form simulations are also compared with that of data from empirical models.