📝 Overview

The RSTRENG Calculator estimates the remaining strength of corroded pipes using industry-accepted methods (Original/Modified RSTRENG, ASME B31G, API 579). It converts all units and guides users on acceptance for continued operation or the need for further assessment.

🧾 Inputs

  • Pipe Outside Diameter: mm, inches (selectable)
  • Wall Thickness: mm, inches (selectable)
  • Maximum Defect Depth: mm, inches (selectable)
  • Defect Length (axial): mm, inches (selectable)
  • SMYS (Yield Strength): MPa, psi (selectable)
  • Assessment Method:
    • Original RSTRENG
    • Modified RSTRENG
    • ASME B31G
    • API 579
  • Output Pressure Unit: bar, psi, MPa

🧮 Calculations

  • All inputs are converted to SI units for consistency.
  • The calculation uses the Folias Factor and defect geometry for remaining strength: Pf=frac2S(t−d)DcdotFFP_f = \\frac{2 S (t-d)}{D \\cdot FF}Pf​=frac2S(t−d)DcdotFF
    • PfP_fPf​: Failure pressure (MPa)
    • SSS: SMYS (MPa)
    • ttt: Wall thickness (mm)
    • ddd: Defect depth (mm)
    • DDD: Outside diameter (mm)
    • FFFFFF: Folias factor (method-dependent)
  • Acceptance is based on the minimum remaining wall ratio (method-dependent).

📤 Outputs

  • Acceptance Status: ✅/⚠️ (based on method and safety margins)
  • Calculated Failure Pressure: user-selected units
  • Folias Factor: (geometry influence)
  • Defect/wall thickness ratio
  • Summary of assessment method and logic