The system also serves as a testing system for {HEAD ~ control umbilicals} that usually are located near {TAIL ~ the pipelines} 
The system also serves as a testing system for { HEAD ~ control umbilicals } that usually are located near { TAIL ~ the pipelines }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL