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