Process Flow Diagram and P&ID
6 weeks · 0 milestones
Produce a Process Flow Diagram (PFD) and a Piping and Instrumentation Diagram (P&ID) for a real or representative chemical or process engineering system to industry standard symbology (ISO 10628 or ANSI/ISA 5.1). The PFD must include: all major process equipment identified with equipment tags, all process streams with stream numbers linked to a stream data table (flowrate, composition, temperature, pressure), the major control loops shown in simplified form, and a process description narrative. The P&ID must include: all equipment with instrument and equipment tag numbers, all instrumentation (sensors, transmitters, indicators, controllers) with ISA function codes, all control loops with instrument tags and signal types, all valves (manual, automatic, check) with valve tags, and line specifications (pipe class, insulation, heat tracing where applicable). Preferred proof: a real PFD and P&ID from a project. Accessible alternative: DWSIM (which includes a PFD drawing environment and equipment library) for the PFD; for the P&ID, draw.io with ISA symbol libraries (free, available as community add-ons) or Lucidchart free tier with P&ID shapes. Proof artifacts: the PFD with stream data table (design artifact) and the P&ID with complete instrument and line annotations (documentation artifact). Verification: a process engineer reviews 'this high-pressure steam line — what line class would you specify, and where is your pressure relief?' — requiring specific reasoning from your own P&ID.
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3 milestones
Choose a chemical or industrial process to document — a distillation unit, reactor system, utility package, or similar. Establish the PFD scope: which unit operations and streams are included, what the system boundary is. Plan the PFD structure: how many unit operations, how streams will flow left-to-right, and which streams need heat and material (H&M) balance data. A well-planned scope prevents the most common PFD error: missing streams or equipment that makes the balance tables inconsistent.
Proof required
Submit your PFD scope document: the process selected, a written description of what is included and excluded, a sketch of the planned PFD layout (hand-drawn is acceptable), and a list of all unit operations and major streams.
What gets checked
- Scope document states explicitly what is included and excluded from the PFD boundary
- Sketch shows planned layout with unit operations in boxes and streams as directed arrows — not text descriptions
- At least five unit operations and eight streams are included — sufficient complexity for a meaningful P&ID in M3