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  <!-- 2 New Articles (Aug 7, 2026 - Batch 11) — Siting & Secondary Containment -->
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  <!-- 5 New Articles (Aug 7, 2026 - Batch 9) — Construction, Seismic & Wind Second-Angles -->
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  <!-- 5 New Articles (Aug 7, 2026 - Batch 8) — Floating Roof Systems & Appurtenances -->
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  <!-- 5 New Articles (Aug 7, 2026 - Batch 7) — Foundations & Bottom Corrosion Protection -->
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  <!-- 5 New Articles (Aug 7, 2026) — Materials, Fabrication & Erection -->
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  <!-- 5 New Articles (Aug 7, 2026) — Engineering Workflow & Code Scope -->
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  <!-- 4 New Articles (Aug 7, 2026) — Annex P, Manway, Materials, Roof Crossover -->
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  <!-- 8 New Articles (Aug 6, 2026) — PWHT, Roofs, Anchorage, Wind, Bottom -->
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  <!-- 4 New Articles (Aug 6, 2026) — Annex X/AL, Lightning Protection, Containment -->
  <url>
    <loc>https://tankcode650.com/blog/annex-x-duplex-stainless-steel-shell-thickness-api-650.html</loc>
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  <!-- 5 New Articles (Aug 5, 2026) — Annex M/S, Foundations, NDE -->
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    <loc>https://tankcode650.com/blog/annex-m-elevated-temperature-api-650.html</loc>
    <lastmod>2026-08-05</lastmod>
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  <!-- Engineering articles -->
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    <lastmod>2026-07-12</lastmod>
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  <url>
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    <loc>https://tankcode650.com/blog/external-pressure-api-650.html</loc>
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  <url>
    <loc>https://tankcode650.com/blog/floating-roof-pontoon-api-650.html</loc>
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    <loc>https://tankcode650.com/blog/hydrotest-api-650.html</loc>
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    <loc>https://tankcode650.com/blog/frangible-roof-joint-api-650.html</loc>
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  <url>
    <loc>https://tankcode650.com/blog/mechanical-datasheet-export-tankcode-650.html</loc>
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  <!-- 20 New Articles (Jul 16, 2026) -->
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    <loc>https://tankcode650.com/blog/corrosion-allowance-calculation-api-650.html</loc>
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