Where should the pressure relief valve be located in a chlorine or sulfur dioxide evaporator?

In the context of a chlorine or sulfur dioxide evaporator, the pressure relief valve should be located downstream of the gas outlet to ensure safe operation and to effectively manage the system's pressure. This positioning allows the valve to monitor and relieve any excess pressure that may build up in the system after the gas has exited the evaporator. By placing the valve downstream, any pressure that exceeds the predetermined safety limits can be vented safely, preventing potential damage or catastrophic failures in the equipment.

Furthermore, this location minimizes the risk of backflow or contamination of the gas supply from the relief valve. It ensures that the gases released during pressure relief are not redirected back into potentially hazardous areas, which could pose safety risks to personnel or equipment. Proper placement in this manner adheres to safety regulations and best practices, enhancing the overall safety and reliability of the gas handling system.