On industrial steam boilers the safety valves are required to be mounted in the vertical up position.

• A. Horizontal
• B. Angled
• C. Vertical down
• D. Vertical up position

Answer: (D)

Safety relief valves must vent in a way that guarantees reliable opening, complete discharge, and safe release of steam. Installing them in the vertical up position ensures the discharge path stays clear of condensate that can collect in horizontal runs and interfere with the valve’s ability to open fully or reseat after relief. It also directs the released steam upward and away from personnel and nearby equipment, reducing scald and contact hazards. If the valve were horizontal or downward, condensate could accumulate in the discharge line or near the valve seat, potentially blocking the flow, causing hammer effects, or hindering proper reseating after relief. For these reasons, the vertical up orientation is the standard requirement for safety valves on industrial steam boilers.