Through-wall circumferential cracks longer than half the circumference
The reference stress of a through-wall circumferential crack in a cylinder (Annex 9C.5.2 and 9C.5.3) now uses Eq. 9C.54, ψ = arccos(sin θ / 2), at every crack length. Cracks with θ > π/2 used ψ = π/3 before.
- From half to about 70 % of the circumference the reference stress is lower than before.
- Beyond about 70 % it is higher: an Acceptable result can become Not acceptable.
- A crack as long as the circumference is refused.
Saved assessments keep their old results. Calculate again each saved through-wall circumferential crack that is longer than half the circumference, or whose largest acceptable flaw in the crack sensitivity analysis is: open it, choose Edit inputs, calculate, and choose Overwrite old assessment. Then use Refresh comparison on saved FAD comparisons that include it.
Fatigue crack growth
Level 2 crack-like flaw assessments of cylinders, spheres, round bars and bolts can grow the flaw through your operating cycles, to API 579-1 9.5.1.2 or to ASME VIII-3 KD-4 (9.5.1.3). Tick Perform subcritical crack growth analysis in the wizard. The result gives the cycles and the date at which the flaw reaches the FAD limit, and the allowable cycles with your margin, on the page and in the PDF report.
Pinned assessments
Pin up to 10 assessments to the top of the dashboard.