Improving P&ID Reading Competency for Operations Team Commissioning Readiness at an Oil & Gas Processing Facility
An Engineering Capability Development and In House Training program designed to improve operations, commissioning, and engineering personnel's ability to interpret P&IDs, perform system tracing, understand control loops and interlocks, and connect engineering documentation with field and commissioning activities.
The client is a national company engaged in hydrocarbon processing, with a facility approaching the final construction and commissioning preparation phase. During the transition from project execution to operations, responsibility was gradually shifting from the construction and project teams to operations. Personnel readiness became an important factor in supporting system handover, pre-commissioning, commissioning, and start-up activities.
As the project approached commissioning, the operations team became increasingly involved in engineering document review, system and sub-system identification, mechanical completion, punch list clearance, loop checks, functional testing, system handover, and start-up preparation. P&IDs were among the primary documents used to connect design intent with actual field conditions. During this process, variations were identified in personnel experience and P&ID reading capability.
The primary issue was not simply the ability to recognize P&ID symbols, but the ability to translate diagram information into process understanding and technical action. Some personnel could identify equipment, valves, instruments, and tag numbers individually but still required guidance when tracing process flow from upstream to downstream, connecting instruments to control loops, understanding alarm, trip, shutdown, and interlock relationships, and using P&IDs as references for field verification and commissioning.
Root Cause
Experience Gap
Experience in reading and interpreting P&IDs varied among team members.
Fragmented Knowledge
Process, piping, instrumentation, control, alarms, and interlocks tended to be understood as separate elements rather than as one integrated system.
Symbol-Based Learning
Previous learning tended to emphasize symbol and terminology recognition without sufficiently connecting them to process behavior.
Limited Tracing Practice
Opportunities to perform systematic upstream-to-downstream tracing exercises were limited.
Engineering-to-Operations Gap
A gap existed between how engineering documentation represented design intent and how operators needed to understand actual field conditions and actions.
PT KGM designed a 5-day Engineering Capability Development program delivered through In House Training. Rather than focusing primarily on symbol recognition, the program followed a structured learning path: Process Understanding → P&ID Reading → Systematic Tracing → Control & Instrumentation → Alarm & Interlock → Field Application → Commissioning Readiness. Training materials were customized using selected and anonymized project P&ID extracts in accordance with client confidentiality requirements.
Program Structure
Process Engineering Foundation
Participants understand basic process behavior and equipment functions before interpreting P&IDs.
P&ID Reading
Participants can read the main structure and information contained in P&IDs.
P&ID Tracing Workshop
Participants can systematically trace process systems from upstream to downstream and explain system functions.
Control, Alarm & Interlock
Participants can explain the relationship between process conditions, measurement, control logic, alarms, trips, interlocks, and final actions.
Commissioning Application
Participants can connect P&ID information with field verification and commissioning activities.
Before / After
Before
At the initial stage, participants were relatively capable of recognizing symbols and identifying basic equipment but showed inconsistent capability in system tracing, control-loop and interlock interpretation, and connecting P&IDs with field activities.
- Symbol recognition: relatively good
- Equipment identification: adequate
- Process tracing: inconsistent
- Instrument loop interpretation: limited
- Alarm and interlock interpretation: limited
- P&ID-to-field correlation: inconsistent
- Commissioning application: required guidance
After
Following the intervention, participants were guided to use P&IDs more systematically, starting from understanding process intent and progressing toward translating engineering information into field verification and commissioning requirements.
- More consistent symbol and tag recognition
- Improved understanding of P&ID structure and information
- Upstream-to-downstream tracing capability
- Improved control-loop interpretation
- Improved understanding of alarm, trip, and interlock relationships
- Improved connection between P&IDs and actual field conditions
- Improved use of P&IDs during commissioning activities
Engineering Capability Model
Participants recognize symbols, tags, and basic P&ID elements.
Participants understand information represented in P&IDs.
Participants can follow process flow relationships from upstream to downstream.
Participants can understand relationships among process, instrumentation, control, alarms, trips, and interlocks.
Participants can use P&IDs to support field verification and commissioning activities.
Participants can use P&ID information as one of the bases for technical judgment in operations and commissioning contexts.
Business Impact
- Improved technical understanding consistency among operations, commissioning, instrumentation, and process engineering teams.
- Reduced dependence on individual explanations during initial P&ID interpretation.
- Improved operations personnel readiness for loop checks, functional tests, field verification, and system handover.
- Established a competency baseline that can support further coaching and capability development.
- Improved the team's ability to connect engineering documentation with actual field conditions.
- Reduced the knowledge gap between project and operations teams during the transition toward commissioning and start-up.
The primary value of the program was not simply the delivery of training, but the development of engineering capability that could be directly applied to project execution. The intervention helped transform P&IDs from engineering documents into operational decision-support documents. The value covered improved people readiness, stronger learning processes, support for project transition, and improved cross-functional knowledge transfer.
People
Improved technical competency, confidence, and operations personnel readiness.
Process
Established a more systematic approach to P&ID interpretation and tracing.
Project
Supported system handover, commissioning readiness, and transition toward start-up.
Knowledge
Reduced dependence on individual tacit knowledge and improved cross-functional knowledge transfer.
Technical Lessons Learned
P&ID Reading is Process Understanding
P&ID reading is ineffective when taught merely as symbol recognition. Participants need to understand relationships among process conditions, equipment, piping, instrumentation, control, and operational response.
Tracing is a Core Skill
Upstream-to-downstream tracing is a fundamental skill for understanding how an entire process system operates.
P&IDs Must Be Connected to the Field
The value of P&IDs increases when participants can translate diagram information into field verification, loop checks, valve verification, and functional testing activities.
Control and Interlocks Must Be Understood as Process Behavior
Instruments, alarms, trips, and interlocks should be understood as part of system responses to changing process conditions rather than as isolated symbols.
Competency Development Must Be Evidence-Based
The effectiveness of capability development should be evaluated through assessments and practical exercises rather than attendance or participant satisfaction alone.
This case demonstrates that P&ID reading capability development delivers the greatest value when designed around the actual project workflow. By combining Process Engineering, P&ID Reading, Tracing Workshop, Control & Interlock, Field Verification, and Commissioning Application, the program evolves from technical training into an engineering capability intervention.
The primary outcome was the establishment of a P&ID learning approach more closely aligned with operations and commissioning requirements. Participants were not only trained to read drawings but also to understand process intent, perform systematic tracing, interpret controls and interlocks, and connect engineering documentation with actual field conditions.