How to read Piping and Instrumentation Diagrams (P&IDs) ?
How to read Piping and Instrumentation Diagrams (P&IDs) ?
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What enrolled engineers say
The emphasis on best practices over shortcuts shows, even at a beginner level, and it maps cleanly to how diagrams behave once they hit prod docs. The section where they trace the LT‑101 → TIC‑101 → FV‑201 control loop, including the interlock note and revision cloud, stuck with me; that's how I expect engineers to read a P&ID in oilgas or chemicalpharmaceutical infra. I wasn't sold on the skimpy treatment of vendor legend variance and redlines—wished there was more there. Still, it doesn't talk down to you, which is rare.
the valve tag conventions section clarified line numbers vs service codes; it's practical, though I wished more on instrument loops.
Clear walkthrough of ISA‑5.1 symbols; the moment tracing a control valve loop from the reflux drum example and explaining fail-open vs fail-closed—it clicked fast. As a grad, it helped map diagrams to prod infra decisions, though I wasn't sold on the alarm tag bit and wished there was more on chemicalpharmaceutical variants.
Is this course for you?
You should take this if
- You work in Oil & Gas Upstream or Pharmaceutical & Healthcare
- You're a Piping & Layout Engineering / Instrumentation Engineering professional
- You prefer self-paced learning you can revisit
You should skip if
- You need a different specialisation outside Piping & Layout Engineering
- You need live interaction with an instructor
Course details
Course suitable for
Key topics covered
Course content
The course is readily available, allowing learners to start and complete it at their own pace.
- What is P&ID?33 min
- Basic View of P&ID29 min
- ISA General Notes19 min
Opportunities that await you!
Career opportunities
Why people choose EveryEng
Industry-aligned courses, expert training, hands-on learning, recognized certifications, and job opportunities-all in a flexible and supportive environment.
What learners say about this course
Feels aimed at people who’ve already tripped over the obvious gaps and want names for them. The BEP vs DEP boundary in Section 2.4, especially the battery limits checklist tied to the sample P&ID, stuck; that’s the kind of thing that bites you in oilgas infra when arch docs meet CI handoffs. It’s mostly clear, though I wasn’t sold on the brief pass over IFC vs IFD revisions. I’ve moved from barely adequate to actually competent, which helps in prod.
Coming from software, this course reframed an old control problem the way refactoring a legacy service does: same constraints, clearer mental model. The walk through the ISA sizing equation, especially the Cv vs Kv example with water at 60°F, stuck because it mirrored how I sanity-check RPS assumptions in prod before a PR lands. I liked the section on flashing vs cavitation; the pressure drop chart felt like reading infra limits instead of hand-wavy arch talk, and it clicked fast. As a beginner track it mostly lands, though I wasn't sold on how briefly valve trim selection was handled; a few more edge cases would help folks crossing over from chemicalpharmaceutical or energyutilities. The pacing works for between-meeting study, and the exercises felt closer to CI checks than homework. I've already reused the sizing worksheet like a repo snippet, which is saying something.
Needed material that wouldn’t fall apart under a PR-level sanity check, and this mostly held. The LMTD vs ε-NTU section, especially the shell-and-tube example where fouling factors changed sizing, stuck with me and maps well to how I think about legacy arch versus modern constraints. It connects old plant math to how I reason about infra tradeoffs in prod, even if the plate exchanger coverage felt light. still, it trimmed a lot of mental tech debt I’d been carrying from chemicalpharmaceutical work.
Section 3's shell-and-tube LMTD worked example (120→80°C, 2-pass) stuck; the step where fouling factor bumps area made the math click, it's easy to map to a prod calc. Mostly helpful, but I wasn't sold on the brief NTU coverage—wished there was more obs on sizing tradeoffs for chemicalpharmaceutical service.
Oct 2, 2026 
