Casing Burst & Collapse Calculator
Check burst and collapse ratings for any OD, wall thickness and grade — handy when you're on location without the spec book.
Formulas
Barlow burst
Pb = 0.875 × 2 × Yp × t / ODYield collapse
Py = 2Yp × [(D/t − 1) / (D/t)²]Worked example
GIVEN
- 9-5/8" 47# N-80
- Wall t = 0.472 in
- Yp = 80,000 psi
WORKING
- Pb = 0.875 × 2 × 80,000 × 0.472 / 9.625
Burst ≈ 6,866 psi (API: 6,870 psi)
FAQ
Why 0.875?
API allows 12.5% under-tolerance on wall thickness, so burst is calculated on 87.5% of nominal wall.
Run it with your well data
Field & Metric units, works offline, save and share results with your crew.
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Reference only. Always verify against your company procedures and well-control certification.