The unit feed valve is a challenging valve which can cause swings in the amount of conversion through the hydrocracker unit. If the swings are wide enough, this will actually limit unit throughput and lead to increased coke laydown on the catalyst, potentially shortening reactor life.
Feed valves are usually set up as flow-control loops and are configured to fail open so that a valve failure will protect the furnace’s radiant section tubes. If a radiant tube loses or has insufficient flow it can become so hot that it melts and ruptures, causing fuel to dump directly into the furnace firebox.
Poor valve control provides inconsistent feed rates and can lead to difficulties controlling the outlet temperature of the furnaces, or allow layers of the coke to build on the inside of the radiant tubes. This shortens the furnace cycle time between decoking procedures, which causes increased and unplanned unit shut downs.
Achieve unrivaled valve control using Spartan’s steel body Fisher V300 or Fisher ET/EWT globe valves with ENVIRO-SEAL packing. Gain increased throughput, reduce unplanned shut downs and increase your reactor life.