Structural Design on the Polyethylene Coating of Long Distance Buried Spiral-Welded Steel Pipeline

The new structure design and research on multi-polyethylene coating of long distance buried spiral-welded steel pipeline have been carried out based on some standards and codes like CAN/CSA-Z245.21-98 and SY/T4013-95 and the corresponding foreign standards. A new kind of structure for the multi-polyethylene coating of oil/gas pipeline has been proposed. The technical data for the FBE coating is that the thickness of FBE layer is between 120-160 μm, the thickness of binder layer is between 170-250 μm; the PE thickness is between 1.8-2.0 mm, the thickness of coating layer at spiral seam is not less than 1.0 mm. The authors consider that this new multi-polyethylene coating can achieve a optimal performance price ratio and decrease production cost, but it needs to be further verified in actual site application.