1. A Safety-Factor is used to communicate about Risk. It is used to ensure that the design compensates adequately for both Systems-Engineering and operational uncertainties.
2. Historically, Safety-Factors were applied to mechanical loads. We are using it here to describe the amount of Safety-Margin we Wish to have designed into the System. The target and Constraint Levels are specified at the required Levels and then the Safety-Factor is applied to allow Safety-Margins. (An Assumption is being made here that there is only one Safety-Factor involved; there could be several.)
3. A Safety-Factor is either prescribed by Standards, such as Engineering Rules or Policy, or it is specified at project Level.
4. A Safety-Factor is a dimensionless ratio. Compare to a Safety-Margin, which is either expressed using Units-of-Measure (as it is the difference between two Levels on a Scale), or as a percentage value based on the required target or Constraint Level being 100%.
|Required Level||Estimated/Actual Level||Estimated/Actual Safety-Factor||Estimated/Actual Safety-Margin|
This Concept entered by Adore.
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