Local Thinning Analysis

🧮 Overview

📝 Inputs

  • Design Pressure: bar, psi, MPa (user-selectable)
  • Operating Pressure: bar, psi, MPa (user-selectable)
  • Measured Wall Thickness: mm, inches (user-selectable)
  • Original Wall Thickness: mm, inches (user-selectable)
  • Pipe Outside Diameter: mm, inches, cm (user-selectable)
  • Pipeline Design Code:
    • API 579
    • ASME B31.3
    • ASME B31.4
    • ASME B31.8
  • Output Pressure Unit: bar, psi, MPa

📊 Calculation Logic

  • All input units are converted to SI for calculation.
  • Each design code sets a minimum allowable ratio of measured/original wall thickness for acceptance (e.g., API 579: 87.5%).
  • The plugin checks: Measured Thickness≥(Code Allowable Ratio)×Original Thickness\text{Measured Thickness} \geq (\text{Code Allowable Ratio}) \times \text{Original Thickness}Measured Thickness≥(Code Allowable Ratio)×Original Thickness
  • Outputs the required minimum thickness (in mm and inches), measured thickness, and acceptance status.

📤 Outputs

  • ✅/⚠️ Acceptance or warning status (based on code)
  • Required minimum wall thickness (mm/in)
  • Measured-to-original thickness ratio (%)
  • Code reference and explanation
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