Separators are the most important static equipment used in chemical industries. These are principally used to separate vapor from liquid phase; the liquid phase can be a single continuous phase or a mixture of two immiscible phases. Both horizontal and vertical separators are extensively used in industries, and some typical applications include the following:
• Compressor knockout (KO) drum • Inlet separator in a gas processing plant • Distillation column overhead separator • Flare KO drum • Desalter
Separators are normally designed as steady-state equipment, i.e., the fluid physical properties do not change with time, though a dynamic state in a separator is not uncommon.