Piping and Instrumentation Diagrams (P&ID): Read, Interpret and Create

Program Overview

The P&ID is the master document of a process plant. Designers build it, operators run the plant from it, maintenance teams isolate equipment with it, and safety reviews such as HAZOP are conducted around it. Anyone who cannot read a P&ID fluently is working with an incomplete picture of the plant.

This program teaches the language of process diagrams from the ground up. Participants learn how block flow diagrams, process flow diagrams and P&IDs relate to each other, how instrument tags and line numbers are constructed, and how to trace a process stream and its control loops across multiple sheets. The final sessions move from reading to creating, using EdrawMax to draft P&ID sections and instrument loop diagrams to recognized symbology standards.

Learning Outcomes

• Distinguish the purpose and content of BFDs, PFDs and P&IDs and explain how they are used across a project lifecycle
• Decode instrument tags, function letters and line designations using ANSI/ISA-5.1 conventions
• Use the legend and lead sheet to identify equipment, valves, instruments and specialty items
• Trace process streams and identify pipe size, material class and service from line numbers
• Identify control loops and distinguish pneumatic, electric, hydraulic and software signal lines
• Create a P&ID section and an instrument loop diagram using engineering drawing software

Program Modules

1. Introduction to Piping and Instrumentation Drawings — the role of BFDs, PFDs and P&IDs in design, operation and safety reviews
2. Instrumentation Terminology — measured variables, primary elements, transmitters, controllers and final control elements
3. Information in PFDs and P&IDs — what each drawing type shows and what it deliberately leaves out
4. Legend and Lead Sheets — using the master symbol sheet to identify P&ID symbols, abbreviations and labels
5. Reading and Interpreting P&IDs — sheet conventions, continuation flags and drawing revision control
6. Piping Identification — line numbering, size, material specification, insulation and service of each pipeline
7. Tracing Process Flow and Equipment — following a process stream and identifying pumps, vessels, exchangers and valves
8. Signal Lines — pneumatic, electric, hydraulic, capillary and data link signal representation
9. Loops, Hook-Ups and Loop Diagrams — identifying control and safety loops and creating an instrument loop diagram
10. Practical Application with EdrawMax — drafting P&ID sections and loop diagrams to standard symbology

Who Should Attend

• Process, instrument and electrical engineers in the early stages of their careers
• Plant operators and control room staff
• Instrument and maintenance technicians
• Engineering drafters and document controllers
• Project and HSE personnel who participate in design and HAZOP reviews

Standards & Codes Referenced

• ANSI/ISA-5.1 (Instrumentation and Control Symbols and Identification)
• ISO 14617 (Graphical Symbols for Diagrams)
• ISO 10628-1 (Diagrams for the Chemical and Petrochemical Industry: Specification of Diagrams)
• DIN 19227-1 (Graphical Symbols and Identifying Letters for Process Control Engineering)
• BS 1646 Parts 1–4 (Symbolic Representation for Process Measurement Control Functions)
• PIP PIC001 (Piping and Instrumentation Diagram Documentation Criteria)

Assessment & Certification

Assessment includes a written examination on symbology and drawing interpretation and a practical exercise in which each candidate traces loops on an unfamiliar P&ID and produces a correct loop diagram in EdrawMax. Practical sessions take place at ASEEE-approved training centers.

Successful candidates are awarded the ASEEE competency certificate, issued with a unique certificate ID that employers and clients can verify online through Certificate Check. The certificate records the competencies demonstrated and supports continuing professional development records.