For many years, the Petroleum Industry has relied mainly on the conventional vessel-type separators. They are bulky, heavy and expensive in capital, installation and operation. Due to economic and operational pressures, the petroleum industry has recently shown interest in the development of innovative alternatives to the conventional separators. One such alternative is the Gas-liquid Cylindrical Cyclone (GLCC). Unlike the conventional vessel type separators, the GLCC is simple, compact, low weight, low-cost, requires little maintenance, and is easy to install and operate. It is therefore gaining popularity as an easy-to-operate economically attractive, alternative to the conventional separator. The development ranking of the various separation technology alternatives are shown schematically in Fig. 1. As shown in this figure, conventional vessel-type separators have reached their maturity, except for some minor improvements that are being incorporated, such as new developments of internal devices and control systems. Large diameter vertical cyclones and hydro-cyclones have also been used by the industry for some time. However, recent trends in development are focused towards new type of compact separators such as the GLCC