dropping to the bottom of the pipes with the gas above. Liquid-free gas is drawn off at the far end of the separation pipes by risers at the top of the pipes. The risers are manifolded together and the gas is routed to further treatment. From the base of the separation pipes liquids flow through down-comers into a further, lower array of horizontal pipes. These pipes slope down away from the inlet, they can typically be 100 to 250 metres in length. The initial section of the lower pipes provides for further gas/liquid separation and the far end provides a buffer storage volume for the liquids which are drawn off at a steady rate for further treatment. The operating pressure in the slug catcher is maintained by a pressure controller and pressure control valve in the gas outlet. The liquid level in the storage end of the slugcatcher is controlled by a liquid level controller and level control valve in the liquid outlet. A Parking Loop slug catcher combines features of the vessel and finger types. The Gas/Liquid Separation occurs in the Vessel, while the Liquid is stored in the parking loop shaped fingers. A Hybrid Slug Catcher combines the high efficiency of a vessel separator and the large storage volume of a harp slug catcher. A basic slug catcher design contains the buffer volume for gas and liquid. A control system is used for controlled outflow of gas and liquid to the downstream processing facilities. The inlet section is designed to promote the separation of gas and liquids. References http://www.glossary.oilfield.slb.com/en/Terms/s/slug_flow.aspx Petroleum production Natural gas technology Pipeline transport Pigging