Installed at the top of the BOP above the flow cross. Function is to divert returned fluids away from the drill floor. There are two types of flow diverter.
- Passive – creates a friction fit seal between the rubber element and the drill Tension in the rubber element and well pressure maintains the seal.
- Active. Active diversion relies on external hydraulic pressure to create a seal between the element and the drill string. A Hydraulic regulator is required to maintain the seal in the face of changes as different components pass through the element. This method requires an oil regulator, accumulator, charging pump and hydraulic controls.
Source: IADC UBO / MPD Glossary, December 2011. Global Standards