API 5CT L80 Pipe Calculator
API 5CT — Hydrostatic test pressure and pipe weight. Yield strength is locked to the grade value.
API 5CT L80 has a minimum yield of 552 MPa (80 ksi) and is produced in the quench and tempered condition with hardness controlled to ≤23 HRC. It is the standard sour service casing grade, NACE MR0175 qualified for wells with H₂S.
When to use this calculator: Calculate hydrostatic test pressure and casing weight for L80 sour service well design and preliminary procurement checks.
Example (API 5CT L80)
| OD (mm) | Wall (mm) | Result |
|---|---|---|
| 177.8 | 10.36 | 51.5 MPa | 515 bar test pressure (f=0.8) |
Results are reference values — verify against API TR 5C3 (OCTG) or ASME B31.8 (line pipe) before use in final design.
Pipe Weight per Metre
W = 0.02466 × t × (OD − t) | API 5C3
Hydrostatic Test Pressure (API 5CT §10.12.3)
p = (2 × f × YS_min × t) / D | Rounded to nearest 0.5 MPa. Max 69.0 MPa.
f = 0.8 (standard coefficient for this grade and all sizes).
Related Technical Guide
API 5CT L80 — Grades, Specifications & Selection Guide →Related Resources