EN 14015 Shell Design Calculator

Allowable stress and minimum shell course thickness for design and test conditions (BS EN 14015:2004, §9.1–9.2)

◉ BS EN 14015:2004 §9.1–9.2 STYLE CHECK · NOT A REGULATORY SUBMISSION TOOL

⚠ Indicative tool only, and structurally distinct from the existing API 650 and IS 803 Shell Design/Thickness calculators. EN 14015 fixes joint efficiency at 1,0 throughout (§9.1.4) — no material/radiography table needed — and its allowable stress is capped at 260 N/mm² regardless of material grade (§9.1.1). Its thickness formula also includes the internal design/test pressure directly, which the basic API 650 and IS 803 formulas don't. Verified directly against this edition's page images; the test-condition formula (Eq.4) deliberately excludes the corrosion allowance term that the design-condition formula (Eq.3) includes, per the standard's own equations.

Identification

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Tank ID

Location

Record Type

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Allowable Design & Test Stress (§9.1.1)

Specified Minimum Yield Strength N/mm²

S = 2/3 × yield, capped at 260 N/mm² (design). S_t = 75% × yield, capped at 260 N/mm² (test). For carbon/carbon-manganese steel above 100°C design metal temperature, use the certified yield at that temperature instead (§9.1.2, not applied automatically here).

Result

Allowable design stress S—

Allowable test stress S_t—

Shell Course Minimum Thickness (§9.2.2, Eq.3–4)

D — Tank Diameter m

H_c — Height, Course Bottom to Design Liquid Level m

W — Max Design Density, Product kg/l

W_t — Max Design Density, Test Medium kg/l

p — Design Pressure mbar

c — Corrosion Allowance mm

Design pressure may be neglected if ≤10 mbar (§9.2.2 note). Test pressure p_t = 1.1×p automatically if p>10 mbar, else 0. Corrosion allowance is added directly in the design-condition formula only.

Result

Design pressure used (0 if ≤10 mbar)—

Test pressure p_t (1.1×p)—

Shell thickness, design condition e_c—

Shell thickness, test condition e_t—

Governing thickness (greater of e_c, e_t)—

Also check §9.1.5 (Table 16): the specified thickness shall never be less than the minimum nominal thickness banded by tank diameter and material — not computed here, cross-check separately. Maximum specified shell/reinforcing plate thickness is 40mm (§9.1.6); no course shall be thinner than the course above it, except the top compression area (§9.1.7).

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