API 5CT J55 Pipe Calculator
API 5CT — Hydrostatic test pressure and pipe weight. Yield strength is locked to the grade value.
API 5CT J55 has a minimum yield of 379 MPa (55 ksi) and is produced in the normalized or hot-finished condition. It is the standard grade for surface casing, conductor casing, and shallow low-pressure well applications.
When to use this calculator: Calculate API 5CT hydrostatic test pressure and pipe weight for J55 surface or conductor casing during preliminary casing design.
Example (API 5CT J55)
| OD (mm) | Wall (mm) | Result |
|---|---|---|
| 339.7 | 9.65 | 13.0 MPa | 130 bar test pressure (f=0.6) |
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 = 0.6 for J55 with OD > 244.5 mm (9⅝"); f = 0.8 for OD ≤ 244.5 mm.
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