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“P&ID Checking” – Commissioning Video Training Course – “The 9 Key Elements of Successful Plant Commissioning” – Part 4 of 10

Commissioning Training - MindMap - The 9 Key Elements - P&ID CHECKING

What is P&ID Checking?

After the 3rd commissioning training video “Mechanical Completion” we continue with the 4th part: P&ID Checking

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Click here to watch the next video “PRE-COMMISSIONING” (part 05 of 10).

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Commissioning Training - MindMap - The 9 Key Elements - P&ID CHECKING

“The 9 Key Elements of Successful Plant Commissioning”
Click the mind map above to download your free PDF now!

P&ID Checking – Video Transcript

Hello everybody,

Here is Thomas Stuenkel, founder of, a commissioning manager, and a commissioning engineer.

Welcome to part 4 of my 10 parts video mini-training course for commissioning newbies. I hope you already enjoyed Part 1, 2, and 3.

In this fourth course I want to explain more about the third key element, P&ID Checking. You will learn how to prepare and how to perform a P&ID check.

As always, I’m using the mind map format for my presentation because it’s easier to remember. Of course, you can download as well this mind map in HD quality from my download section on

Let’s start with the detailed explanation of key element number 3, P&ID Checking.

The 9 Key Elements of Successful Plant Commissioning, Element 3, P&ID Checking.

P&ID Checking – You can say as well system check, system check for construction and engineering errors, plant inspection or punching. All these words are synonyms for P&ID checking.

Who will execute the checks?

Usually this is done by the commissioning team members, especially by commissioning engineers.

Which items have to be checked?

We have to check all the piping. Here it is very important to walk each and every single line. If you check small and simple equipment, like small pumps and simple vessels, there is usually no need for a vendor’s representative, but for large and complicated machines, like boiler feed water pumps or turbines, it will be a good idea to invite the vendor onsite and to perform all checks together with him.

All the instrumentation has to be checked. Usually, this will be done together with an instrumentation engineer. You, as a commissioning engineer, verify the basics, like nameplate, flow direction, mounting position, temperature range, and measurement range.

When you perform the P&ID check, you will do it from different points of view. The most important is safety. Is the installation safe? Can it be operated in a safe manner? Did the construction team a good job?

Please observe the system from the point of view of an operator. Is it possible to operate this valve or do we need an additional platform? Write these findings down.

The same is valid for maintenance works. Is there a hoist over this big motor and pump to remove it, or do we have to build a complicated mechanism?

It’s a good idea to perform the following additional tasks, like to attach temporary identification tags, or to attach temporary signs for various lines, valves and equipment, or to put on temporary signs for medium and flow direction. Why is this a good idea? Because this makes it easier to perform the future commissioning and startup activities.

Which P&IDs should we use?

The most important rule is to use the latest revision only. All P&IDs should be marked with the system boundaries.

There are a few, or sometimes even a lot more, other documents. You need to perform the P&ID check with different kinds of plans, equipment drawings, different type of checklists, engineering and vendor specifications, company, national and international standards, hook-up drawings, and vendor documents for complicated equipment.

When you perform the P&ID check, you will for sure find one or more deviations from the P&ID or other specifications. In such cases, you have to put this deviation into a punch list. If you are unsure of the validity of any item, please contact the lead unit process engineer to discuss it.

Here is one important advice. Any punch item which changes any feature of the P&ID must be screened by the lead unit process engineer from a design and safety point of view before implementation. The punch list should be transmitted to the construction, engineering and QA/QC department.

I want to give you an example how to perform the P&ID check. Please be aware that this method can change in different industries, but the basic rules apply.

At first, define which color has which meaning. Mark checked items with a highlighter on the system P&IDs.

Faulty items get a check number. Write this check number on the P&ID and enter this number with a description of the fault into the punch list.

Make two copies of the marked system P&IDs and two copies of the system punch list. Attach each punch list to its respective P&ID.

One copy is used as a work or recheck copy. The other copy is used as a commissioning team master copy and filed with the respective system files.

The original punch list and marked-up P&ID is the system master punch list and is sent to and kept in the system punch list master files by QA/QC department. Punch items should be signed off by the respective originating punch team or authority.

Construction QA/QC control management, through their respective punch list coordinator, takes care of execution, correction, and signing off of the original system master punch list through the respective construction discipline punch list execution team.

After correction of punch items, the respective construction punch list execution team will inform the respective originating punch team or authority that the work is completed and will do a combined recheck for immediate signing off of the original system punchlist.

Last, but not least, I want to let you know an important fact. A smooth startup of any industrial plant depends to a large degree on the thoroughness the unit is checked beforehand.

I summarized the fourth lesson. We learned how to prepare and how to perform a P&ID check.

In lesson number 5, I will speak about the fourth key element, pre-commissioning, in more detail.

Please sign up for my Commissioning Coach newsletter and I will keep you up-to-date about new training lessons.

Thank you for watching and see you soon.

Leave a Comment

  • PARAMASIVAM KALIYAN March 9, 2014, 7:30 am

    Dear Sir,
    Thankyou very much for the video clip training which is very helpful for fill the gapes of my commissioning knowledge.Your video clips are very simple and easy to understand all the technical words has been utilized . Kindly send me more of about Precom ;comm clips to boost up my knowledge. Also let me know when you are coming to Singapore so that it will be convenient for me to attend seminar.
    Thanking you
    Sincerely ,
    a Permanent Resident of Singapore and an Indian origin.

  • Thomas Stuenkel March 10, 2014, 11:04 pm

    Hello Kaliyan,

    Just sign up for my newsletter and I will inform you about new videos and new training dates and locations.

    –> <–

    Talk soon,