Frequently Asked Question
In a report with an On/Off valve with the accessories MTL-4521, ASCO SOV, Emerson Actuator, and OMS Ball Valve, all the accessories are individually meeting SFF of above 70% but the overall SFF is coming to be 54%. Can you explain this please?
Last Updated a year ago
The Safe Failure Fraction for the final element group is determined by adding up all of the individual components that make up the element. In your configuration you may have defined that your partial stroke test is initiated manually. Only diagnostics that are initiated automatically are included in the SFF calculation.