The major cost of on-land pipeline will comprise of:
·Survey of Route
·Wrapping and Corrosion Coating
·Welding of Line Pipe
·Laying of Pipes
·Backfilling and Restoration
·Cathodic Protection by Impressed Current System
·Placement of Route markers
The major cost of subsea pipeline will comprise of:
·Concrete Coating for Weight Enhancement
·Cathodic protection by Sacrificial Anodes
·Laying of Pipes by Laybarge
·Welding of Line Pipes (partly on barge)
·Installation of Pipe risers (vertical line from the platform to sea bed)
Following figure gives proportion of cost components of subsea pipelines and on-land pipelines.
The cost of line pipe may be almost the same for the same quantity of fluid flow (except in case of subsea pipe line the thickness may be increased for stability and safety). The major difference between on-land pipeline and subsea pipeline is the cost of concrete coating, cathodic protection (sacrificial anode) is much costlier tha impressed current system), and the pipeline laying method.
The on-land pipeline is laid by side boom tractors, whereas for the subsea pipeline the laying is lay-barge. The rates for lay-barge are much higher than rates for side-boom tractors.
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About Me: I believe our life is precious and God meant us to make the best of it - so its important to enjoy and celebrate it, of course in a responsible manner. An optimist to the core, I always see the glass half full. I like to take life as it comes and not to become too serious on the harsher aspects of it.