Overview - EN ISO 10628-1:2015 (ISO 10628-1:2014)
EN ISO 10628-1:2015 specifies the classification, content and graphical representation of flow diagrams used in the chemical and petrochemical industry. It defines drafting rules and minimum information requirements for the main diagram types - block diagrams, process flow diagrams (PFDs) and piping and instrumentation diagrams (P&ID) - and clarifies their role in the plant documentation lifecycle (planning, construction, commissioning, operation, maintenance and decommissioning). This European adoption is identical to ISO 10628-1:2014 and does not apply to electrical engineering diagrams. It is a collective application of ISO 15519.
Key topics and technical requirements
- Classification of diagrams
- Distinguishes block diagrams, process flow diagrams (including utility flow diagrams) and P&IDs according to information need.
- Minimum information content
- Block diagrams: frame denominations, incoming/outgoing material names, main flow directions (plus optional flow rates, energies, operating conditions).
- Process flow diagrams: equipment types and designations, flow routes and directions, material/energy names and flow rates, characteristic operating conditions.
- P&IDs: detailed equipment, piping, valves, instrumentation and control functions representing the technical realization of the process.
- Drafting rules
- Layout of flow diagrams, connecting lines and arrows, inscription practice, scales and diagram limits.
- Graphical standards
- Equipment, valves and fittings must follow graphical symbol rules (see ISO 10628-2) and measuring/control representations per IEC 62424.
- Interoperability
- Encourages consistent reference designation (e.g., IEC 81346 series) and alignment with ISO 15519 for exchange of diagram data.
Practical applications and users
- Used to produce standardized plant documentation that enables clear information exchange between:
- Process engineers and plant designers
- Piping and instrumentation engineers
- CAD/drafting teams and technical illustrators
- Project managers, commissioning and maintenance teams
- Regulatory reviewers and asset owners
- Benefits include reduced misinterpretation, improved safety and operational handover, consistent design deliverables, and easier integration between engineering disciplines and software tools.
Related standards
Keywords: EN ISO 10628-1:2015, diagrams for the chemical and petrochemical industry, process flow diagrams, P&ID, block diagrams, drafting rules, graphical symbols.
