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Diagrams for the chemical and petrochemical industry - Graphical symbols Ingestion-build-202139 BS EN 62315-1 describes Digital1 Scope This part of ISO 10628 defines graphical symbols for the preparation of diagrams for the chemical and petrochemical industry. It is a collective application standard of the ISO 14617 series. This part of ISO 10628 does not apply to graphical symbols for electrotechnical diagrams; for these, see IEC 60617.