ASME B31G Remaining Strength of Corroded Pipeline

Learn more about PASS/START-PROF pipe stress analysis software

Determines if corroded pipeline segments require repair or replacement. Analysis outputs include:

• Failure stress level
• Maximum safe operating pressure (with safety factor)
• Burst pressure (without safety factor)
• Maximum allowable defect length

Method 1: Original B31G (0.67dL) - Level 1

Approximates corroded area as 0.67 × d × L

Method 2: Modified B31G (0.85dL) - Level 1

Approximates corroded area as 0.85 × d × L

Method 3: Exact Trapezoid

Calculates corroded area using trapezoidal numerical integration

Method 4: Equivalent Area

Calculates corroded area as d_a × L, where d_a represents average pit depth. Uses equivalent flaw length L × d_a / d for Folias factor calculation.

Method 5: RSTRENG Effective Area - Level 2

Calculates corroded area using trapezoidal numerical integration. Analyzes all potential local metal loss combinations - requires n!/2(n − 2)! iterations to evaluate all remaining wall thickness configurations. The exact trapezoid method represents a specific case within this effective area methodology.

Input Parameters

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