Definition(s)
Return System
Handles returns from the well – injected fluids, (gas and liquid) cuttings, hydrocarbons, formation water etc. Consists of flow diverter, flow cross, emergency shut down valve, choke manifold, pressure vessel and solids control equipment, from where the liquid phase used for drilling is passed on to the drilling fluid tank, and then to the rig pumps for re injection to the well.
Source: IADC UBO / MPD Glossary, December 2011. Global Standards