Piping & Instrumentation Diagram Series


Vents and Drains

Vents and drains on high and low points of lines
respectively, to be used for hydrostatic testing, are not shown, as they are
established on the piping arrangements drawings. Process vents and drains are

Valves on the P&ID
1. Show and tag process and service valves with
size and identifying number if applicable. Give pressure rating if different from
line specification.

2. Indicate any valve that have to be locked open
or locked closed.

3. Indicate powered operators.

Next time

Showing Instrumentation on the P&ID

Atilio Zelaya

Total Cad Systems Inc.


One Response to “Piping & Instrumentation Diagram Series”

  1. Kunle Says:

    I am presently a graduate of chemical engineering. I have an extreme interest in knowing how to develop a P & ID, hence I would love for you to recommend a training program that you feel is thorough enough in teaching me this skill and making me employable.
    Thanks a lot.
    Do send your reply to Ayodaygee@yahoo.com

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