Exida , the global leader in functional safety, cybersecurity, and alarm management for the process industries, has presented Emerson with the 2020 exida Safety Award for their Fisher Digital Isolation TOV SIS Solution. The Fisher Digital Isolation Final Element is a triple offset valve (TOV) solution which was developed to serve the needs of customers' in critical safety instrumented system (SIS) applications. The Emerson final element is the first valve assembly to be certified as a whole system.
The TOV Solution is made up of the Fisher Digital Isolation Triple Offset Valve assembled with the Fisher G or CB Series actuators and Fisher DVC6200 Digital Valve Positioner. exida was eager to work alongside Emerson as they developed the first Final Element valve assembly to meet exida’s rigorous eRAVA certification requirements. Introducing the first valve assemblies to meet the design process requirements of Safety Integrity Level (SIL) 3 per IEC 61508. The exida Safety and Cyber Awards were designed to identify and acknowledge the exida certified products which best display an innovative and practical approach to the Functional Safety Lifecycle.
With a defined process in place for the complete valve assembly design and development, the Fisher Digital Isolation TOV SIS Solutions are engineered, built, and tested to meet specifications to operate as a complete assembly. “We were excited to work with Emerson to accomplish the first certified valve assembly,” comments Loren Stewart, exida Evaluating Assessor for this project. “By providing a complete SIL solution for valve assemblies, Emerson is reducing unknown variables while helping ensure safety is incorporated, earning them this award.” “exida certification assures our customers that the Fisher Digital Isolation TOV SIS Solutions will perform as designed in their most demanding SIS applications and provide a significantly improved probability of failure on demand (PFD) rate.
In some cases, the failure rate of the assembly will be up to 50% less than the combination of the same components assembled individually, allowing a plant to significantly extend proof test intervals,” explains Mike Hoyme, a product manager for Fisher Rotary Valves.
