What is the main purpose of a drip pan elbow downstream of a PSV?

The main purpose of a drip pan elbow downstream of a Pressure Safety Valve (PSV) is to collect condensate. This is a critical function as it helps in managing any liquid that may form as a result of temperature changes in the system. When steam or gas leaves the PSV and cools, it can condense into liquid. The drip pan elbow is designed to accumulate this liquid, preventing it from flowing back into the system, which could lead to issues such as water hammer, pressure surges, or even valve malfunction.

This design not only contributes to the safety and efficiency of the system by ensuring that condensate is properly drained, but it also aids in maintaining consistent operational conditions. Other options, such as increasing pressure, decreasing flow, or monitoring temperature, do not align with the primary function of a drip pan elbow in this context. Those functions pertain to different components or systems and do not reflect the typical use of a drip pan elbow.