A new production method for CRAlined steel pipe based on sheet metal

摘要

OVER THE PAST 25 years more than 1000km of pipeline made from corrosion-resistant alloys (CRA)nhave been successfully installed for transporting wet, corrosive, oil and gas product streams, and providingnan outstanding service record. There is a growing demand for CRA-lined pipe due to the fact that corrosivenconditions will increase significantly in the future as the produced fluids will contain higher water cuts andngreater concentrations of hydrogen sulphide and carbon dioxide. In addition, these increasingly-corrosive productsnneed to be transported over longer distances and with higher pressures, yet in a reliable and environmentallybenignnway.nConsidering operating expenditures over a pipeline’s design life versus capital expenditure costs, CRA-linednpipe is a very interesting solution for preventing corrosion-related problems, if a suitable corrosion-resistantnmaterial for the respective service condition is selected. Owing to a lack of supply capability for CRA-pipes,nhowever, which is partly due to the limited capacities of semi-finished CRA clad materials (i.e. hot rolled, weldoverlay,nand explosive bonding) potential exploration projects will be jeopardized.nThis paper provides an introduction into the state-of-the-art processes required to produce CRA-clad and -linednpipe, and introduces BERG-LAY, a new, innovative, and patented way of manufacturing CRA-rolled linedsteelnpipes based on flat plate materials. This manufacturing process for mechanically-bonded CRA-lined steelnpipe is based on two separate plates: carbon steel to meet the pressure loads as a backing material, and CRAnfor corrosion resistance.