How to read P&ID’s to get most out of it

How to read P&ID’s to get most out of it

Process Engineering World

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Basic course for beginners

Why enroll

Mastering "How to Read Piping and Instrumentation Diagrams" (P&IDs) unlocks career advancement opportunities in the oil and gas, chemical, and process industries. By learning to interpret and understand P&IDs, professionals can transition into roles like Process Engineer, Instrumentation Technician, or Plant Operator, or enhance their career prospects in fields like project management, engineering design, and operations management. With expertise in P&IDs, individuals can improve their problem-solving skills, enhance their understanding of complex systems, and increase their value to employers, leading to improved job prospects, increased earning potential, and opportunities for leadership and innovation.

Opportunities that awaits you!

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Career opportunities

Course details

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Course suitable for

Oil & Gas
Pharmaceutical & Healthcare
Health, Safety & Environmental
Mechanical
Metallurgy & Material Science
Onshore Pipeline
Petroleum
Piping & Layout
Production

Key topics covered

Understanding P&ID’s. Reading P&ID’s, Key ideas and tips to understand hidden points in P&ID’s.

Training details

This is a live course that has a scheduled start date.

Live session

Our Alumni Work At

Ex-Tata Steel , Precision Engineering Division , West Bengal university

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Arghyapratim Haldar

Sr Process Engineer

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Questions and Answers

Q: You're staring at a separator P&ID at 02:00 offshore and google "how to read P&ID line number and service code on offshore separator". A line is tagged 12"-P-150-CS-101. From the drawing alone, what can you reliably infer?

A: A: Line size, service code, material family, and flange class are encoded here. That's exactly what the tag gives you. B: Class 150 is a flange rating, not MAWP. Pressure depends on material and temperature. C: Corrosion allowance is a line class detail, not readable from the tag alone. D: Temperature derating exists. Class 150 at 200 °C is already constrained.

Q: During normal operation you google "P&ID pump minimum flow recycle how to read". The centrifugal pump on the P&ID shows a minimum flow recycle with an FCV failing open. Suction pressure drops suddenly. What happens first if nothing intervenes?

Q: You're asked to confirm a valve choice and search "P&ID control valve type throttling versus isolation". The P&ID shows a 6 in pneumatically actuated valve on a pressure control loop upstream of a separator. Which interpretation holds?

Q: Pre-commissioning offshore, you google "P&ID loop check transmitter to control valve sequence". The P&ID shows PT-204 feeding PIC-204 driving PCV-204. What's the correct verification sequence?

Q: While reviewing an upset you search "separator pressure increase downstream effect P&ID reading". Separator pressure creeps up 15% above normal, still below PSV set. What downstream effect is most likely per the P&ID?

Q: During SAT you google "datasheet says valve fail open but P&ID shows fail close". Datasheet for PCV-312 says FO, but the P&ID bubble shows FC. What action aligns with good practice offshore?

Q: You search "P&ID relief valve inlet outlet requirements how to read". A PSV is drawn with a 2 in inlet and a 3 in outlet to flare. What does the P&ID actually confirm?

Q: You're checking metallurgy and google "P&ID material mismatch galvanic corrosion offshore". A stainless steel instrument tap is shown on a carbon steel wet gas line. What's the real risk?

Q: An operator asks and you google "P&ID level control valve fail position meaning". A separator LCV is marked fail open. Loss of instrument air occurs. What does the P&ID tell you?

Q: You measure 5 barg IA at the skid but search "instrument air pressure P&ID discrepancy measured vs drawing". P&ID utility header is marked IA 7 barg. What's the right interpretation?