PSA 2.6 — The Code Map: B31.1 vs B31.3 vs B31.4 vs B31.8
X52 (Sy = 359 MPa), 20″, hoop allowable:
B31.3: S = min(2/3×359, 460/3) ≈ 153 MPa B31.4: 0.72×359 ≈ 258 MPa (~70 % more pipe utilisation) B31.8 class 3: 0.50×359 ≈ 180 MPa Same steel: the pipeline trusts it 1.7× harder — hydrotest + ductility + remoteness buys that. Where a pipeline enters a plant, the scope break (typically first flange/valve inside the fence, contract-defined) flips the rulebook; anchor flanges (our Sheet 01!) often live exactly at that boundary to decouple the two regimes.
🔒 Members only
The rest of this lesson is in the members' libraryThe full text, the 3D model, the worked example and the quiz.
Join to read it →A members' lesson from EPiC Circle
This one is part of the members' library — the full lesson, its 3D model, the worked example and the quiz open with membership. Dozens of lessons across every EPC discipline are free to read without an account.
See what's free →Educational teaching material — simplified and illustrative. Not for engineering
design use.
© EPiC Circle · provided by PipeAxis