Application of controls to remote block valves when single phase power is the only option

Remote controlled pipeline block valves in high consequence areas require an extremely reliable installation in order to ensure line blockage and isolation. The Department of Transportation (DOT) defines high consequence areas (HCAs) as commercially navigable waterways and locations of environmental sensitivity or populated areas. When the installations of motor operated valves (MOVs) occur in these areas, the consistent operation of the MOV is critical to the design. In this paper three methods of MOV control where single-phase power only is available are examined: using a single-phase motor and control, using a capacitor static phase converter, and using an adjustable speed drive for phase conversion in 10 HP and below applications. The result of the study describe an installation that provides superior control, offers remote communication features, simplifies electrical component count, and reduces application specific design criteria.