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Tie-In List


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#1 _urban_

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Posted 07 June 2024 - 08:40 AM

Hello to all.

 

Let's say that a piping line is to be dismantled.

The data (operating & design conditions, insulation, etc) that you add to the tie-in list is of the "to be dismantled line" or of the adjacent piping line / equipment, and why?

I.e. what info does the dismantling contractor want to know?

 

Thank you.



#2 latexman

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Posted 07 June 2024 - 09:53 AM

The data/information on each row should apply to a specific "line number" per the P&ID.

 

The contractor needs to know:

Exactly where does the line to be demo'd begin.

Exactly where does the line to be demo'd end.

Diameter?

Schedule?

Length?

Tracing?

Insulation?

 

We would spray paint everything that would be demo'd with neon yellow paint.



#3 Pilesar

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Posted 07 June 2024 - 10:11 AM

Line list forms usually include columns for pressure and temperature. These data are useful when planning new lines. The same line list forms are often used for listing lines for demolition. Just leave blank the information not needed. Communication covers a lot of potential problems so include some way for contractor to ask for more information if you have doubts. Finding and talking to the contractor directly with an example of what you intend to provide will probably give you peace of mind that you are fulfilling your role adequately. For any engineering deliverable, it is good practice to understand how the information will be used. Once you learn the basics of how your deliverables fit in other workflows, you can better tailor the deliverable to their needs. Your customer may tell others 'that stupid engineer did it wrong' without ever explaining to the 'stupid engineer' what is really wanted! They are less likely to complain to others if they know you are a real person trying to do the job correctly.



#4 _urban_

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Posted 08 June 2024 - 03:39 AM

Thank you all for your answers.
But at a specific tie-in, do you provide info of the dismantled line, or the the one that is connected to it?

#5 latexman

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Posted 08 June 2024 - 04:28 AM

But at a specific tie-in, do you provide info of the dismantled line, or the the one that is connected to it?

 

If the "one that is connected to" is not to be demo'd, I would not provide that information.






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