Calculators
Each one shows the formula, every intermediate value and a plain-English explanation.
ILI report check
Upload a POF 100-style CSV. Get ERF for every anomaly, a ranking by severity, 49 CFR 192.933 flags and a CSV export.
CorrosionModified B31G (0.85 dL)
Failure pressure, safe pressure and ERF from maximum depth and length.
CorrosionOriginal B31G
The conservative parabolic criterion, plus the Level 0 maximum allowable length.
Corrosion · Level 2RSTRENG effective area
Paste a river-bottom profile. Every subsection is checked and the critical length is found.
Mechanical damageDent strain (B31.8 App. R)
Bending and extensional strain combined into an effective strain vs the 6% limit (2018+ equations).
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🧮 Show the work
Folias factor, flow stress, area term and failure stress are all on screen, so you can check them against your own spreadsheet or code.
📋 Built for report review
Single-defect sites check one anomaly at a time. DigSheet checks the whole list and tells you which defects need attention first.
Checked against published examples
Automated tests reproduce worked examples from the published sources below. The full table, with inputs, published values, DigSheet values and tolerances, is in tests/RESULTS.md.
| Method | Published sources reproduced |
|---|---|
| Original B31G (+ Level 0 length) | Kiefner & Vieth, Oil & Gas Journal (1990); MidstreamCalculator worked example; PipingToolset P.E.-verified fixtures |
| Modified B31G | MidstreamCalculator worked examples 2 and 3; PipingToolset fixture |
| RSTRENG effective area | Kiefner & Vieth (OGJ 1990) effective-area prediction for a two-depth test flaw (735 psig) |
| B31.8 App. R dent strain | Mackintosh, "Pipeline Dent Strain Assessment Using ASME B31.8" (ndt.net), metric and inch examples |
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