Who Writes What — ASME, API, ASTM, ISO, EN, and Why There Are Five of Them
Read this first. This note explains the landscape of standards bodies — who they are, what problem each was created to solve, and what kind of document each produces. It paraphrases and cites; it reproduces no clause text, no tables and no allowable values from any standard. Nothing here replaces reading the applicable edition of the actual document.
Look at the code list on any project. ASME B31.3. ASME B16.5. ASME Section VIII and Section IX. API 610, API 650, API 5L. ASTM A106, A105, A193. ISO 9712. EN 13480. NACE MR0175. NFPA 70.
A reasonable person assumes there is…
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