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We used to have proximity switches on our wedge plug valves. They were activated while the valve was seated in either the open or closed positions by switch and shaft collar “contact”. During operation of the valves, once unseated, the valve indication on the TDC would go from either open or closed to moving. As for the Wilson Synder we’ve never had an in house proximity switch. Now that we use the MEA Operator it has a local switch for seat/unseat. I do not see any reason though why the shaft couldn’t be tapped for bolt installations that will “contact” proximity switches located at the Drum 1, Drum 2 and Bypass positions. As for showing seated/unseated some sort of collar “contacting” a proximity switch as we have with our MEA appears to be an easy installation. One thing to keep in mind is that the Coke Dust will sometimes keep the switches from working, so occasional cleaning of the switches may be needed.
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We’ve never had this problem, as far as not being able to move the head after the “hockey puck” falls. We seldom encounter a “hockey puck” but have heard in places were they are more frequent using 1″ stock bar welded to the Drum ID to catch said “hockey puck” and keep it from falling.
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No. We’ve never tried it for that application. Dry steam and continued quench oil (5-10mins after) have seemed to be adequate in keeping down foam @ switch.
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We use Fischer Valves. We’ve closed them fully at times, but generally we may close them to 40-50% in order to get adequate preheat within 45-60mins. By adequate I mean 400*F+ skin temps./minimum OVHD temp. drop after switch. If you are to start doing this on a routine basis I would suggest thourough and routine drum seem inspection.
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We use a butterfly valve in the common lines of our drum pairs. We’ve had extremely short warm ups, but only choose to do so when we are behind in schedule. We run 14hrs.
