LINE LIST – Input data temperature carefully!

All of us already know that line list is one of deliverable documents provided by process engineer. It is our important product document as a process engineer at IKPT. Many important data will be covered in this document.

The information to be provided in the line list depends on CLIENT's requirement. Based on my experience, on DEGC Project, ConocoPhillips asked IKPT to put so much information in this document –line name, from-to, operating and design condition, PWHT, NDT, flushing, blowing, and indication of critical pipe etc-. So many of them, right? ConocoPhillips asked all of them since it was project base. On the other hand, when we prepare line list for proposal stage, the whole data does not have to be complete.

Here, I assume that all of us have experience in developing line list -It feel just peculiar when process engineers at IKPT have no experience in developing this document..ha ha ha.just kidding guys-. So, I assume that the explanation about what line list is, how to determine the correct data, etc. are not required anymore.

The data in line list will be used by piping engineer to conduct pipe stress and flexibility analysis (temperature, pressure and density). Pipe stress and flexibility is influenced more by temperature rather than the pressure. Temperature will affect the expansion of both the fluid in the pipe and the pipe material itself. That is why I wrote “Input data temperature carefully “. I mean, we must be sure we have given the correct temperature data.
If you want to know more about what the stress pipe is, you can read here and here

I am not too worried about pressure since the pipe has a specific rating that's generally higher than required design pressure. For example, for pipe which has operating pressure 20 psig, we input design pressure in line list say 22 psig- 10% higher than the operating pressure-. This pipe has rating 150 # which is capable of handling the pressure even more than 150 psig - .

I just say not too worried, it does not mean the correct data is not important. Design pressure in line list will be used as basis of test pressure requirement - 1.5 x DP (internal design gauge pressure) for hydrotest and 1.1 x DP for pneumatic test, for safety reason maximum pneumatic test is 100 psig (or depends on project requirement). You can read ASME B 31.3 for more detail about test pressure -.

Hopefully the following pictures will tell you more about the important of correct data in line list.



Piping engineer has responsibility to provide adequate support and to provide sufficient flexible design. Process engineer, for that sake, has responsibility to provide correct data for that design, then we provide line list.
So, Don’t under estimate that job!