System Parameter
- Diameter: 18/20" - 20" Line transitions down to 18" at A riser ID Variation
- 385mm [measured in 1.5D bend] A riser
- 489mm max in B Launcher & riser
- 473mm is nominal ID
- Step change between 466m and 489mm MBR
- 20" A riser has 1.5 bends. Back to back
- 1.5D in the 408mm [18" 19mm wt B riser
- Miter bend at Bravo riser [design not available] Line length
- 75 km [at 0.12 m/s = 200 hours run time] Wall Thicknesses
- 20" mainline - 17.5mm
- 20" B riser - 9.5mm / 12.5mm / 19.05mm / 21mm
- 20" A riser - 50mm
- 18" A riser - 19mm Depth
- 3m
Challenges
The challenges to inspect PL120 can be summarized as
- Line is low pressure & Low flow [oil, 13.1 bar, 0.3 m/s]
- Line is known to produce wax and difficult to clean
- Line has complex geometry
- 1.5 bends, back to back
- Heavy wall
- Short pig receiver with short minor barrel and single isolation
- Large ID variation [385 - 489]
- mitred bend