Rotork IQ and IQT intelligent electric actuators with Rotork Pakscan P3 two-wire digital control have been chosen to provide valve control throughout the Llobregat desalination plant in Barcelona, Spain. The EUR 230 million plant uses seawater reverse osmosis technology to supply 200,000cum/day of potable water, representing 24% of the water consumed by the 4.5 million people living in Barcelona. More than 400 Rotork actuators have been installed, controlled by eight hot-standby Pakscan P3 master stations. The Pakscan master stations provide a direct interface for each of the actuators controlled on its secure, two-wire loop with the Siemens Step7 PLC that operates the sequence of the recently opened plant’s processes. The combination of Rotork IQ actuation technology and Pakscan P3 two-wire control offers the capacity to include up to 240 actuators on a single 20km, 2-wire loop. It also allowed for built-in diagnostic features including performance data and fault location indication. Rotork IQ and IQT intelligent electric actuators feature non-intrusive set-up and adjustment, double-sealed IP68 watertight enclosure, data-logger, and comprehensive software tools for plant records and valve diagnostics and versatility encompassing isolating, modulating and multi-port valve applications.
