Sure, but if you ever lose steam trace you must have the compressor shut down and purge the line.
And we know that operation will never allow that.
Just know that a single failure may render the line unsafe.
I have seen this so many times with tracing, chem injection, impressed current, and others.
One failure will either force a system shutdown or risk consuming 100% (or more) of the CA.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

Of course it is possible to use “CS with 3.2 mm corrosion allowance” if the risk associated with a future loss of containment is tolerable. You probably won’t be able to change the consequence side of the equation if the equipment inventory and layout is fixed, so you will have to focus on the likelihood side, and then work out how much it will cost over the lifetime to maintain and verify the barriers, including replacement. Compare that cost to alternative materials and see which is the more attractive to management. Bear in mind that the modelling results could be substantially over pessimistic, so make sure that you have followed the ECE user manual, and that you have taken into account guidance from NACE TR21413.

Steve Jones
Corrosion Management Consultant

www.linkedin.com/in/drstevejones

All answers are personal opinions only and are in no way connected with any employer.