Having no expertise in composites I am still a bit confused why the choice of carbon fiber here. Makes perfect sense if the pressure was internal.
Is light weight really an advantage for the vessel itself or does it just a convenience for handling operations?
Interesting paper 100% on subject, just skimmed but says tube started delaminating at pressure less than predicted by FE computational methods.
https://www.iccm-central.org/Proceedings/ICCM12proceedings/site/papers/pap631.pdf
Stick me in a Inconel, titanium of high grade stainless tube please. Save the composites for planes, bikes, and sportscar theatre