The ability to separate oil, gas, and water in oilfield operations is critical, that why we have two and three phase separators. Two phase separators are designed specifically for gas and oil, while 3 phase separators are designed for gas, oil, and water. A vessel that separates the well fluids into gas and two types of liquids: oil and water. This type of separator is commonly called a free-water knockout because its main use is to remove any free water that can cause problems such as corrosion and formation of hydrates or tight emulsions, which are difficult to break. A three-phase separator can be horizontal, vertical or spherical. Vertical separators are designed primarily for intermediate gas-oil ratios, while horizontal separators are suited for high gas-oil ratios and constant flow wellstreams. These high-pressure separators are available in vertical or horizontal configurations, with a wide range of sizes and capacities.