Ejectors perform a central role in Flare Gas Recovery Systems [subsequently denoted by FGRS] by compressing the low pressure gas mixtures to working pressures. Ejectors utilize the available high pressure gas as an energy source to bring about this compression. Since the commencement of Oil and Gas Production and advent of petroleum refineries, little importance was given to the generated flare gas mixtures. This gas was termed as waste gas and was collected in large diameter headers. The gas was then burned off and the combustion products were let off to the Atmosphere. Flare Gas Recovery (FGR) is the process of recovering the waste gases that would normally be flared, so they can be used as fuel gas elsewhere in the facility. This results in reduced emissions and cost savings. Flare Gas Handling Systems: Since the commencement of Oil and Gas Production and the advent of petroleum refineries, little importance was given to the generated flare gas mixtures. This gas wa