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