Electro-hydraulic actuators deliver improved safety at India’s tank farms

21 August, 2015

The application required the valves to be electrically operated, spring-return failsafe with SIL2 functional safety certification for use in hazardous areas. During the two-year specification writing period, Rotork worked closely with the three main oil companies in India, providing live product presentations, technical advice and performance reports, leading to the selection of Rotork Skilmatic SI/EH electro-hydraulic actuators operating triple-offset butterfly valves as the standard for the critical ROSOV application.

The Rotork Skilmatic self-contained electro-hydraulic valve actuator combines all-electric simplicity with the precision of hydraulic actuation and the reliability of spring-return failsafe operation. Standard Skilmatic features include non-intrusive setting, performance monitoring and configurable data logging of valve and process data for analysis, preventative maintenance and asset management.

Explosion-proof

To-date, over 1600 Skilmatic actuators have been supplied through Indian valve makers. All actuators are certified explosion-proof to Exd llB T4 with CCoE (Chief Controller of Explosives) approval and SIL2 functional safety system certification. For this application actuators are supplied with dual Modbus fieldbus communications and separate local controls mounted outside the tank bung with a local ESD (Emergency Shut Down) pushbutton.

Along with the above, Rotork was also selected to supply 4000 CP/GP spring return pneumatic actuators to various valvemakers for tank farm applications. Rotork therefore took the lead as the single vendor for failsafe actuators on triple-offset butterfly valves on all tank farm applications.

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