For the last few years, an oil company has carried out laboratory testing of tri-layers PE
and PP pipe coatings in hot wet environment.
The objective was to simulate the disbondment from the steel substrate noted in some cases in
the field (with no corrosion associated), and understand the physico-chemical mechanism at
the origin of the loss of adhesion experienced.
This paper will sum up the results obtained so far from this RD effort, with a special
highlight on the following points :
?? Durability of the bond between the steel and the FBE primer/Influence of water diffusion
?? Influence of the FBE type and ageing temperature on the disbondment
?? Influence of internal stresses on the disbondment of three layers coatings.
Keywords : pipeline coating-hot water-ageing-durability