Two-phase flow reliefs are typically associated with which scenario?

Two-phase flow reliefs are typically associated with which scenario?

• A. Runaway reactions
• B. Non-choking throttling
• C. Normal ventilation
• D. Dry gas release

Answer: (A)

Two-phase reliefs occur when the relief stream carries both vapor and liquid. This situation arises most often during runaway reactions, where the heat generated drives rapid vapor formation inside a vessel containing liquid. As pressure pushes the liquid to flash to vapor and droplets remain entrained in the gas, the discharge becomes a two-phase mixture. The other scenarios typically produce gas-only or non-relief flows, so they don’t create the liquid–vapor combination that characterizes two-phase flow in reliefs.

Two-phase reliefs occur when the relief stream carries both vapor and liquid. This situation arises most often during runaway reactions, where the heat generated drives rapid vapor formation inside a vessel containing liquid. As pressure pushes the liquid to flash to vapor and droplets remain entrained in the gas, the discharge becomes a two-phase mixture. The other scenarios typically produce gas-only or non-relief flows, so they don’t create the liquid–vapor combination that characterizes two-phase flow in reliefs.