Thank you, everyone, for the responses!
TBD: Based on your feedback on 'preinsulated pipe,' I think we'll stay away from that. Unfortunately the area has a plethora of other utilities in the way for a tunnel. It's feasible, but would be very costly. I think we'll continue to use sched 80 carbon...
Basic system information: Steam distribution system at 125psi, return condensate ~200deg F. Systems typically run 24/7 with the exception of shutdowns for repairs/maintenance. There is over 10 miles of piping that interconnect (for redundant/ back feeds) in various sizes and various settings...
