Charlie Smith - RefiningCommunity.com
You can find MOVs in critical applications all over the refinery. On the coker structure, they operate daily. In the tank farm, they may only move once a year or less. Sulfur Recovery valves can be in nasty, corrosive service while a hydro-processing valve may only see nice, clean hydrogen. MOVs are part of pump and compressor logic systems and unit feed isolation. They are typically large, geared, electrical, and need to work when called upon. Sometimes they operate flawlessly, but often they are a consistent source of irritation for operators and maintenance alike.