(186a) LPG Dryer System Automation

LPG dryers systems can be prone to incident as a result of valve misalignment, partial movement of a valve, and partial completion of a step, to name a few. A well designed Sequence Function Chart with properly instrumented switching valves and process inputs can mitigate the familiar hazards associated with LPG dryer regenerations.

This paper provides an example of a propylene dryer system capable of swapping beds, regenerating the offline bed and returning the bed to standby with a push of a single button. Independent verification of the completion of a step is a key element to the success of the automated dryer system.

An advantage of an automated system is the additional layers of protection beyond administrative controls, operator checklist or captive key systems typical for dryer systems.