Yes Nels, show it to everybody to get them thinking in this direction, but keep in mind this sketch I made in photobucket is decades old and is a revision from my original polypipe plan I sketched in Tommy's Elbow Room 1974.   Flowline in Fairbanks is experienced with wrapping steel pipes with HDPE, they have likely already already seen it and giggled. But the purpose of this pipe design is to break all the rules and move propane in an emergency, we are now at the point where the rules can be bent to prevent a bigger disaster. Nowdays we have plenty of ways to strengthen this little pipe without adding much more cost...  For example we can add a bit of graphene from the graphite mine in Nome. I know how to make graphene from graphite quick+cheap.

goog:  bulletproof graphene plastic

We can also add basalt fiber to make a gasline stronger than the Fiberspar gasline installed at Nikolaevsk/AnchorPoint.

When we get good at making flexpipe then we can make HVDC-elpipes for our SuperGrid.