Flowserve achieves SIL 2 and 3 ratings for Arctic actuators | Automation.com

Flowserve achieves SIL 2 and 3 ratings for Arctic actuators

December 16, 2013 - Flowserve received IEC 61508 SIL 2 and SIL 3 certifications for Limitorque MXa electronic actuator optional output boards and arctic temperature components. This certification is in addition to the original SIL certification granted by exida to the basic MXa in January 2012. Customers can combine the MXa actuator, which is certified to SIL 3, with any of the newly certified boards and components, and all SIL certifications will remain compliant to address arctic environments down to -60˚C (-76˚F). The MXa was designed for long service life in applications that require severe safety measures.

"Customers want assurances that the equipment they purchase for critical installations is safe," said Scott Mayo, vice president, sales and operations, Flow Control Operations, Power Sector. "The SIL certifications for the MXa and its add-ons, and the actuator's built-in safeguard features, reaffirm our commitment to systematic integrity and safety."   

Flowserve customers can order the MXa actuator with any combination of option boards, including network protocol field units like Modbus DDC, Foundation Fieldbus H1, Profibus DP and PA, and Device Net. Optional analog output board and digital output boards are included in the updated certification.   

In June 2012, the company announced availability of the MXa with capability up to a SIL 3 safety rating. Advantages of this certification include continued torque and position protection during a safety event, and the removal of external devices needed to track the actuator's position. Furthermore, the MXa is SIL certified independently of hardware modules, removing the risk for additional points of failure from the safety system.

SIL certification was granted based upon the MXa's reliable LimiGard(TM) technology which means that the user does not need to bypass connection to the actuator's internal relays to ensure sound actuator operation. The internal safeguard features of the MXa actuator are sufficient to report its status and to respond when an ESD is asserted.

For safe operation, no peripheral wiring is required to isolate the actuator from its internal programmable logic. Together, the MXa and its select option boards' Probability of Failure on Demand (PFD) values are the lowest in the electronic actuator industry.
About Flowserve
Flowserve Corporation is one of the world's leading providers of fluid motion and control products and services. Operating in more than 55 countries, the company produces engineered and industrial pumps, seals and valves as well as a range of related flow management services. Flowserve operates a global network of more than 160 quick response centers to provide customers with aftermarket support for its products.

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