Design of a Typical Offshore Transportation System for External Corrosion

The external corrosion assessment of a typical offshore transportation system has been presented. Cathodic protection design was carried out for the pipeline and it was found that a bracelet square weld on anode of L = 195í µí±ší µí±š, G =101.6 í µí±ší µí±š, Thickness = 70í µí±ší µí±š, M = 149.75 í µí±˜í µí±”, ∅ = 1.2235í µí±ší µí±š, N = 128 and s = 300í µí±šwas found to be satisfactory in providing secondary/ backup protection for the 48inchespipeline in the external environment provided. The external anticorrosion coating selected is the Three layer polyethylene (3LPE) coating based on the dimensions of the pipeline and the design temperature of 80℃. The 3LPE external corrosioncoating will comprise of an inner layer fusion bond epoxy, a middle layer: adhesive and an outer layer: High density polyethylene (HDPE) base with additives.