The major conduit portion 34 comprises {HEAD ~ a steel pipeline} formed by {TAIL ~ numerous lengths} of steel pipe 
The major conduit portion 34 comprises { HEAD ~ a steel pipeline } formed by { TAIL ~ numerous lengths } of steel pipe
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH