Advanced FEA & integrity

Steel remembers

Anchor impact and dent on a subsea pipeline · narrated

Duration

1:25

Year

2026

The case

A 2 t anchor hits a 12 in X65 subsea pipeline, unpressurized at that moment, with 11.9 kJ. The wall goes in 34 mm under 549 kN; with the anchor gone the dent springs back to 25.5 mm, and with 180 bar in service it shrinks to 21 mm. The plastic strain does not go back: 22.0 % under the anchor, 22.2 % after rerounding (local peak in the model). An in-line inspection finds the smallest dent of the three.

Topics

• Pipeline dents
• Elastic-plastic FEA
• Narrated explainer

Basis. Generic synthetic case built for this piece. No client data. Not a design verification.