Piping for N2 1

What type of piping should I use for N2 running 125 ft at 165 PSI

wrong forum

hi,
Drop an email or call your N2 supplier, they should support your query.
What is the temperature at this pressure?
Pierre

What is the application and temperature?

Have you looked here:

https://www.eng-tips.com/threads/nitrogen-piping.27735/

Here is a general process piping spec that includes nitrogen.

If flows are small, you can choose between copper or SS316 tubing. If flow requires piping, SS316 would be better to avoid external corrosion over the long term, especially in damp ambient conditions, or when piping runs through difficult to access areas and/ or when it runs along with many other pipes and tubing, making painting almost impossible in the future. In some Operating companies , such services are run in SS316 pipe or tubing for all line sizes <= DN50.