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Internal Lining Damage Investigation of 24inch Jet Fuel Pipelines

This paper represents the analysis and investigation of two pack epoxy internal lining damage on two new build 24” fuel hydrant system (FHS) pipelines. A leak in a nearby 36” irrigation line during construction caused water flooding in the open trench containing the FHS pipelines.

Product Number: 51317--9061-SG
ISBN: 9061 2017 CP
Author: Mushaid Nauman
Publication Date: 2017
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This paper represents the analysis and investigation of two pack epoxy internal lining damage on two new build 24” Fuel Hydrant System pipelines. A leak in a nearby 36” irrigation line occurred during construction of the fuel hydrant system (FHS) and caused water flooding in the open trench containing the FHS pipelines. As a result mud and water went into the FHS pipes placed in the trench. Drainage and cleaning operations were done after which the robotic inspection revealed internal lining damages such as detachment of top coat blisters and bubbles. The cause of the lining damage was at first blamed on the water and mud ingress followed by cleaning operations (water flushing air blowing & drying) however after detailed testing inspection and analysis it was confirmed that the lining was itself of poor quality. The cause of blistering and delamination in flooded and flushed FHS lines was osmotic blistering due to presence of water soluble material (salts or exudate) on the primer surface. The internal lining plant records suggest the conditions were not favorable over the entire lining application period. Very low temperatures and high humidity conditions were observed that lead to poor quality internal lining.

Key words: Fuel Hydrant System (FHS), Blistering, Exudate, Primer

This paper represents the analysis and investigation of two pack epoxy internal lining damage on two new build 24” Fuel Hydrant System pipelines. A leak in a nearby 36” irrigation line occurred during construction of the fuel hydrant system (FHS) and caused water flooding in the open trench containing the FHS pipelines. As a result mud and water went into the FHS pipes placed in the trench. Drainage and cleaning operations were done after which the robotic inspection revealed internal lining damages such as detachment of top coat blisters and bubbles. The cause of the lining damage was at first blamed on the water and mud ingress followed by cleaning operations (water flushing air blowing & drying) however after detailed testing inspection and analysis it was confirmed that the lining was itself of poor quality. The cause of blistering and delamination in flooded and flushed FHS lines was osmotic blistering due to presence of water soluble material (salts or exudate) on the primer surface. The internal lining plant records suggest the conditions were not favorable over the entire lining application period. Very low temperatures and high humidity conditions were observed that lead to poor quality internal lining.

Key words: Fuel Hydrant System (FHS), Blistering, Exudate, Primer

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