Which devices in a separator help direct each phase to the proper outlet?

• A. Weirs and level controls
• B. Heat exchangers
• C. Filters
• D. Pumps

Answer: (A)

Directing each phase to the proper outlet in a separator relies on weirs and level controls. A weir is a raised edge inside the vessel that defines distinct flow paths at specific heights, helping separate the streams so each phase has its own outlet. Level controls monitor the heights of the liquid interfaces (for example, the oil–water boundary) and adjust valves to keep those interfaces in the right positions, routing the gas to the top outlet, oil to the middle, and water to the bottom. This combination maintains stable separation and minimizes cross-flow, which is essential for clean, proper outlet streams. Heat exchangers, filters, and pumps serve different roles and don’t determine which phase exits where.