▁were ▁in ▁the ▁pre lim inary ▁stages ▁of ▁planning ▁a ▁system ▁of ▁production ▁facilities ▁based ▁on ▁the ▁Rank in ▁and ▁Good w yn ▁fields ▁( located ▁about ▁ 1 3 0   km ▁off ▁the ▁coast ▁of ▁D amp ier ), ▁linked ▁to ▁an ▁L NG ▁processing ▁plant ▁and ▁a ▁domestic ▁gas ▁plant ▁situated ▁at ▁With nell ▁Bay . ▁ ▁As ▁the ▁state ▁government ▁had ▁access ▁to ▁more ▁attract ive ▁interest ▁rates ▁than ▁the ▁commercial ▁vent ur ers , ▁the ▁state ▁agreed ▁to ▁fund ▁and ▁build ▁( through ▁SE C WA ) ▁a ▁ 1 5 4 0   km ▁gas ▁pipeline ▁to ▁transport ▁the ▁output ▁from ▁the ▁domestic ▁gas ▁plant . ▁ ▁In ▁addition , ▁SE C WA ▁entered ▁into ▁long ▁term ▁( 2 0 - year ) ▁' take - or - pay ' ▁contract s ▁with ▁the ▁North ▁West ▁Sh elf ▁partners , ▁in ▁which ▁SE C WA ▁agreed ▁to ▁pay ▁for ▁fixed ▁volumes ▁of ▁gas ▁which ▁exceed ed ▁the ▁market ▁demand ▁for ▁gas ▁in ▁the ▁south ▁west . ▁ ▁Engineering ▁design ▁comm enced ▁in ▁ 1 9 7 9 . ▁and ▁the ▁pipeline ▁was ▁constructed ▁between ▁ 1 9 8 3 ▁and ▁ 1 9 8 4 , ▁with ▁the ▁extension ▁south ▁to ▁Bun bury ▁commission ed ▁in ▁ 1 9 8 5 . ▁Const ruction ▁involved ▁the ▁w eld ing ▁of ▁ 1 2 7 , 0 0 0 ▁sections ▁of ▁ 1 2 - met re ▁pipe . ▁Gas ▁first ▁flow ed ▁into ▁the ▁pipe ▁on ▁