Assessment of Adhesives Performance of 3-Layered Polyethylene Coatings in the Oil and Gas Industry
Abstract
Corrosion possess a major treat to long (several thousands of kilometers) pipeline infrastructure in Pakistan and is a key engineering concern. Construction of pipeline involves field wielded joint, wherein 3 layered poly-ethylene (3-LPE) protective layer is applied in a non-controlled environment involving many complexities. The risk factor is amplified by surface degradation (corrosion) and gas leakage, which is a major economic concern for various gas transmission and distribution industries. This research work is aimed at addressing the behavior of 3-LPE on the gas transmission line to avoid the pipe (substrate) surface from harsh environmental condition and longevity in service life. There is well published and known technique at lab for carrying out the application of 3-LPE on pipelines, but in field wielded joint, it is quiet challenging to achieve the equivalent bond strength of 3-LPE applied on the wielded joint due to certain factors. The current research is aimed at the application of 3-LPE followed by on site testing using peel test and other techniques. The field application of 3-LPE starts with surface preparation using cleaning and sand blasting, followed by FBE primer application onto substrate surface at elevated temperature and finally PE layer is applied. The strength and durability of the applied layer is measured using peel test. A regression analysis is performed using ANOVA to assess the durability, strength, and service life of 3-LPE on steel substrate, wherein three key factors were, i.e., surface preparation, pre-heat, and film thickness, were selected for investigation. Surface preparation is significantly important among the three, showing a value of 38.41%, followed by film thickness then pre-heat.
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