PSA 6.5 — Vessels & Columns: WRC 107/537 and 297, Local Stress, Nozzle Flexibility, and When to Go FEA
A 3 m diameter column, 20 mm shell, SA-516-70, design pressure 1.5 MPa at 250 °C. A vendor's datasheet says "allowable nozzle moment, 12 in nozzle: 15 kN·m". Your model reports 12.4 kN·m. Green tick, move on.
Before you do, compute what the pressure has already spent:
R_m = (3 000 − 20)/2 = 1 490 mm σ_h = p·R_m/T = 1.5 × 1 490 / 20 = 111.75 MPa S = 138 MPa (SA-516-70, ASME VIII-1, flat through 250 °C) σ_h/S = 111.75 / 138 = 81 % Commit to an answer before reading on: with 81 % of…
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