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RE: Velan Feed Valve Stuck Up

Home Forums Coking Maintenance Pumps, Valves, Rotary Joints, Cranes Valves Velan Feed Valve Stuck Up RE: Velan Feed Valve Stuck Up

#7333

Mitchell Moloney
Participant


Sticking of the valve is most likely due to inadequate steam purging of the valve. It is important to verify that your steam piping arrangement is proper and that you are not losing flow to the valve purges due to steam being used preferentially in another part of the process. 
 
You can install a blind to do work as long as the switch valve is holding and is deenergized and locked in place while the blind is being installed. 
 
Feed line spool flushing should start before moving the switch valve (3″ steam line is best)and should continue for 5 – 10 minutes, then shut the downstream isolation feed valve.  The amount of flow should be ~ 5klb/hr or more if the MF can handle it. 

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