In one example, each steel pipe has {HEAD ~ a 12 inch} inside {TAIL ~ diameter} and a length of 40 feet , with the pipes being connected in series 
In one example , each steel pipe has { HEAD ~ a 12 inch } inside { TAIL ~ diameter } and a length of 40 feet , with the pipes being connected in series
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH