Apparatus and methods for cooling a mixture of hot gas and liquid received from a compressor and simultaneously separating the gas from the liquid, the apparatus comprising a receiving inlet, a header unit, a collector, and a plurality of conduits comprising turbulators which creates turbulence and heat-exchange surfaces to simultaneously separate the liquid from the gas and cooling both the liquid and the gas, and the method comprising receiving the mixture from the compressor through a receiving inlet; directing the mixture into a plurality of conduits; and in each of the plurality of conduits, simultaneously separating the liquid from the gas and cooling both the gas and the liquid.