The method 2 wherein the composite film is wrapped around {HEAD ~ a pipe} containing {TAIL ~ a volume} of water 
The method 2 wherein the composite film is wrapped around { HEAD ~ a pipe } containing { TAIL ~ a volume } of water
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH