Gas pipeline

Stages
ATI
Soil investigation for cathodic protection (CP) design stage
Stringing of pipes
Above ground production
Non destructive test (NDT) (Above ground permit 10pm-4am)
CP installation
Installation of shrink sleeves
Radio detection, trial pit, xcavation
Lowering
Tie-in
NDT
Installation of shrink sleeves
Back filling with sand
uPVC or concrete slab
Backfilling
Reinstatement
Cleaning
Testing
Final tie-in
ATO
Commissioning (Gas in)