Pipeline Corrosion Assessment (ASME B31G) Calculator

Evaluate metal loss depth and axial length per ASME B31G and Modified B31G to compute the Folias bulging factor, safe pressure, and ERF repair urgency.

Pipe Geometry & Defect Dimensions

Pipeline Outside Diameter OD (in):

Nominal Wall Thickness t (in):

Maximum Defect Depth d (in): From ultrasonic or MFL ILI scan

Axial Defect Length L (in):

Specified Minimum Yield SMYS (psi): API 5L Grade X52 = 52k, X65 = 65k

Operating Pressure MAOP (psig):

Fitness-For-Service Results

Estimated Repair Factor (ERF):

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Safe Burst / Failure Pressure (P_f):

—

Corrosion Depth % of Wall (d/t):

—

Folias Bulging Stress Factor (M):

—

Safe Operating Pressure (P'_safe):

—

Repair Requirement:

—

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ASME B31G & Modified RSTRENG Criterion

ASME B31G is the statutory regulatory standard for determining the remaining pressure containment capacity of corroded energy pipelines. The Estimated Repair Factor (ERF) is the ratio of actual operating pressure ($MAOP$) to allowable safe pressure ($P'_{safe}$). An ERF greater than $1.0$ mandates either a pressure derating or an engineered composite sleeve / steel repair clamp.

Folias Bulging Factor (M)

Internal pressure bulges the thinner thinned wall outward, amplifying tensile hoop stress. The Folias factor $M$ accounts for this geometric shell curvature stress concentration.

Pipeline Corrosion Assessment (ASME B31G) Calculator

Pipe Geometry & Defect Dimensions

Fitness-For-Service Results

ASME B31G & Modified RSTRENG Criterion

Folias Bulging Factor (M)

Frequently Asked Questions