Process Skids, Modular Equipment & Packaged Plants worked example
FAT Duration at 12% retest and contingency allowance: a worked example
Push retest and contingency allowance up to 12% and the picture changes. This example computes every intermediate figure at that operating point. Use it when fat duration in process skids, modular equipment and packaged plants is changing rate or allowance and you want to see the impact.
The inputs for this scenario
- FAT test points to execute: 120 units (unchanged)
- Test point execution rate: 12 units / hr (unchanged)
- Retest and contingency allowance: 12 % (raised for this scenario; the documented default is 10)
Working through the calculation
- Applying the documented formula (Base FAT duration time = required work รท processing rate) to the inputs above produces each figure below.
- At this operating point the engine returns 11.2 hr for adjusted run time, the number this scenario is built around.
- At this operating point the engine returns 10 hr for base run time.
- At this operating point the engine returns 12 % for allowance applied.
- At this operating point the engine returns 12 pieces / min for process rate.
How this compares with the baseline
- Against the tool's baseline example, where retest and contingency allowance sits at 10% and the headline result is 11 hr, this scenario comes in 1.82% above the baseline at 11.2 hr.
- It divides test points by the execution rate for base hours, then applies a retest allowance to give adjusted FAT duration. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.
Results at a glance
- Adjusted run time: 11.2 hr (headline result)
- Base run time: 10 hr
- Allowance applied: 12 %
- Process rate: 12 pieces / min
Run it with your numbers
- Every input above is editable in the live FAT Duration calculator, which recalculates instantly and can be shared with the inputs intact.
Last reviewed 2026-05-12.