📊Overview
The Fitness-for-Service (FFS) Screening tool evaluates whether a pipeline or vessel section is suitable for continued service, based on wall thickness and pressure conditions.
🔢Inputs (user-selectable units)
- Design Pressure: bar, psi, or MPa
- Operating Pressure: bar, psi, or MPa
- Measured Wall Thickness: mm or inches
- Original Wall Thickness: mm or inches
- Corrosion Allowance: mm or inches
🧮Calculations
- All pressures are converted to bar; thickness values to mm for internal calculations.
- Utilization Ratio: Operating PressureDesign Pressure\frac{\text{Operating Pressure}}{\text{Design Pressure}}Design PressureOperating Pressure
- Thickness Ratio: Measured WallOriginal Wall−Corrosion Allowance\frac{\text{Measured Wall}}{\text{Original Wall} – \text{Corrosion Allowance}}Original Wall−Corrosion AllowanceMeasured Wall
- Screening logic flags if thickness or utilization are outside safe limits, per typical FFS standards.
📤Outputs
- Utilization ratio (%)
- Thickness ratio (%)
- Recommendation message (Fit for service or Further assessment needed)