Failure Finding Interval Calculator V1.0

Failure Finding Interval Calculator

Welcome to the Failure Finding Interval (FFI) Calculator. This tool helps you determine appropriate intervals for detecting hidden failures of protective devices through Failure Finding. It uses standard mathematical formulae to calculate the failure finding interval using the required inputs for each formula.

Availability-based FFI

Calculate FFI based on target availability and MTBF of the protective device.

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Economic Optimum FFI

Calculate FFI based on the cost of the multiple failure, the cost of doing the task, the probability the protective device will fail, and the probability it will be needed.

Risk Based FFI

Calculate FFI based on the MTBF of the protective device, the rate of demand on the protective device, and the tolerable period between occurrences of the multiple failure.

Risk Based Voting FFI

Calculate FFI based on the MTBF of the protective device, the rate of demand on the protective device, the tolerable period between occurrences of the multiple failure and the voting configuration

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This Failure Finding Interval (FFI) Calculator is provided for informational purposes only. By using this tool, you agree to the following terms:

  • The results generated by this tool should not replace professional engineering judgment or analysis.
  • The user is fully responsible for any decisions or actions taken based on the outputs of this tool.
  • The developers and owners of this tool shall not be held liable for any damages or losses arising from the use of or reliance on this tool. While we strive for accuracy, we cannot guarantee the completeness or accuracy of the tool's outputs.
  • This tool is provided 'as-is' without any warranties, either express or implied.
  • Always consult with qualified professionals before making critical decisions related to equipment maintenance and safety.