Feed Control

The heavy bottoms from the crude distillation unit are the feed to a vacuum crude unit, and would not have undergone any processing other than the preliminary separation of lighter components. 

Feed valves in this application perform flow control and are fail open, so that a valve failure would protect the furnace radiant section tubes. If a radiant tube loses or has insufficient flow, the tube can become so hot that they melt and rupture, which would cause fuel to dump directly into the furnace firebox. Poor valve control also provides inconsistent feed rates and can lead to difficulties controlling the outlet temperature of the furnaces, or allow layers of coke to build on the inside of the radiant tubes. This typically shortens the furnace cycle time between decoking procedures, which normally requires the process unit downstream to shut down.

Achieve unrivaled valve control using Spartan’s chrome moly bodied Fisher EZ/EW globe valves or V500 ball valves with ENVIRO-SEAL graphite packing. Protect your assets, and reduced unplanned down0time with Spartan’s Vacuum Unit Feed Control solutions. 

Fisher EZ valves (figure 1) are used for throttling or on-off control of a wide variety of liquids and gases. The single-port, globe-style body design offers quick-change trim and a post-guided, unbalanced valve plug. The EZ valve is used in chemical or hydrocarbon processing applications or wherever control of non-lubricating, viscous, or other hard-to-handle fluids is required.

Fisher EW series easy-e valves feature large internal cavities with expanded end connections and a variety of unbalanced and balanced plug designs.

The Fisher V500 eccentric plug rotary control valve controls erosive, coking and other hard-t-handle fluids, providing either throttling or on-off operation.
The FIELDVUE DVC6200 is a digital valve controller capable of operating using 4-20 mA, HART, Fieldbus, or Profibus communication protocols. The basis of its operation is the conversion of a control signal into a pneumatic output controlling valve position.