Publish validation cases for the pressure vessel calculators

[YurMil]

Closes #117

Adds a Validation cases section to the two calculators with a normative basis, using the exact fixtures from their unit-test suites (#96) as the single source of truth — the same numbers that gate CI in the app repos now serve as public evidence of correctness.

Dished End Calculator (3 cases)

• DIN 28011 Klöpper, Da=1000/s=10/h1=40: R, r, dish depth (0.1935·Da − 0.455·s = 188.95 mm), total height, blank Ø 1170 mm, weight ≈ 84.4 kg — each with the hand calculation spelled out
• DIN 28013 Korbbogen: 0.8·Da / 0.154·Da form factors, dish depth 248.65 mm, blank factor 1.14
• Forming-thinning estimate: knuckle 12 % governs → 8.8 mm vs QC minimum 9.7 mm triggers the warning; suggested starting plate 11.5 mm

Blind Flange Calculator (3 cases)

• PN class selection table (10→PN10 … 321→PN400, EN 1092-1 series)
• Flat circular plate bending closed form: σ = 3PR²(3+ν)/(8t²) = 77.34 MPa and center deflection 0.170 mm for the P=1.6 MPa / R=125 / t=20 case; thickness solver verified as the exact inverse
• Gasket seating bolt load Wm1 = π·G·b·y ≈ 103 673 N and the governing-case bolting check

Each section states explicitly that these numbers run as unit tests on every engine change, so a release that breaks them cannot deploy — the trust argument the tool pages were missing.

Acceptance criteria

• At least 2 validation cases per covered calculator on its docs page
• Cases generated from / consistent with the test fixtures (single source of truth)
• Standard references included (DIN 28011/28013 form factors, EN 1092-1 PN series, classical plate theory)

Verification

• pnpm typecheck + full pnpm build green (MDX validated, broken-link check passes)

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
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[gemini-code-assist]

Code Review

This pull request adds detailed validation cases to the documentation for both the blind flange and pressure vessel dished end calculators, aligning the documentation with the automated test suite. The feedback suggests correcting the engineering nomenclature for the gasket seating bolt load (changing Wm1 to Wm2) and resolving a unit mismatch in the blank weight calculation formula to improve clarity.

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[chatgpt-codex-connector]

Correct the graphite gasket seating load

With the shipped calculator data, the Graphite gasket material uses y = 40 in static/utility-apps/blind-flange-calculator/assets/index-BJcMC13r.js, and the engine computes Wm1 as π·G·b·y. For the documented G = 250 mm and b = 12 mm case, selecting Graphite therefore gives about 376,991 N, not 103,673 N, so this validation case is not reproducible in the calculator despite the section saying users can compare digit for digit.

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