Api Tank Design: LT50
API 650 aboveground storage tank shell design data — minimum nominal shell thickness by tank diameter range and allowable design/test stresses for common shell plate materials
| diameter range | shell course | design stress psi (psi) | diameter max ft (ft) | diameter min ft (ft) | material spec | min thickness in (in) | min thickness mm (mm) | min yield psi (psi) | notes | test stress psi (psi) |
|---|---|---|---|---|---|---|---|---|---|---|
| LT50 | 1 | 23,200 | 50 | 0 | ASTM A36 | 0.1875 | 4.8 | 36,000 | All courses tanks ≤50 ft diameter (3/16 in min) | 26,700 |
| LT50 | 2 | 23,200 | 50 | 0 | ASTM A36 | 0.1875 | 4.8 | 36,000 | All courses tanks ≤50 ft diameter | 26,700 |
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