Cryogenic piping for magnet cooling

[gravitate]

We have to install a substantial amount of cryogenic piping which is He around 4K. What usually is the best material for the pipe and insulation? Also to tag individual spools how can this be done so the identification mark remains in tact through the life of the pipe?
Many thanks

 

[EdStainless]

What is your piping?
At this temp most of what I have seen is Invar pipe with SS jacket and vacuum for insulation.

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Plymouth Tube