Carbon Dioxide Transport Rewrites Line Pipe Specifications
Dense phase carbon dioxide behaves nothing like natural gas in a pipeline, and the difference matters at the weld. Free water plus carbon dioxide makes carbonic acid, which attacks the heat-affected zone preferentially, and running fracture arrest in a dense phase line demands toughness at levels ordinary line pipe never had to prove. Specifications emerging from European and American projects require weld zone testing that most ERW mills cannot currently pass. That narrows the qualified supplier list dramatically, which is exactly why the segment carries premium pricing while the projects are still in permitting.
Market Impact: Protects 186 dollars per tonne








