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09/06/2018 - API 5CT 10th edition

Casing and Tubing

The 10th edition of API Specification 5CT, Casing and Tubing, has been published.

The effective date of this edition is July 1, 2019

Key changes to the 5CT specification can be reviewed on the API website

The key changes to highlight for Spec 5CT are:

- Scope to reference RP 5C6 for new requirements for large diameter PSL 2 casing not specifically covered by Spec 5CT (e.g. conductor casing)
- New content on converting USC unit to SI units to be used in stress intensity factor toughness and updates to SSC requirements
- Updated pipe range length requirements for carload shipping
- Update requirements for grade N80 Type 1
- Update requirements for pipe with special end-finish threads
- Updates to how material grades are grouped throughout document
- Eliminate Supplementary Requirement 15 (test certificates) and add new requirements for mill test reports/certifications in its place
- Expand triangle stamp marking requirements
- Add polymer quenching for grade L80
- Update hardness requirement for grades L80, C90, T95 and C110 as result of NACE MR0175
- Delete clause on reducing couplings
- Update requirements for L80 13Cr inside surface preparation
- Expand requirements for NDE personnel certification
- Elimination of grade M65 entirely from the specification
- Updates and clarifications for NACE testing methods as result of updates to NACE’s requirements
- Increase casing coupling OD wall thicknesses for 4-1/2, 5 and 5-1/2 inch, and update spec respectively throughout as result, e.g. recalculate weight gain/loss of material
The key changes to highlight for TR 5C3 are:
- Increase casing coupling OD wall thicknesses for 4-1/2, 5 and 5-1/2 inch, and update TR respectively throughout as result
- Updates to using nominal linear mass in calculations and remove equation for calculating theoretical mass
- Corrective updates to mass steel density and related equations and calculations.


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