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Three recent international pipeline projects illustrate that the typical surface profile height and abrasive blast cleaning requirements in today’s coating standards and specifications have not been sufficient to define the adequate level of the abrasive blasting.
The author uses three recent international pipeline projects as examples, to illustrate that the typical surface profile height and abrasive blast cleaning requirements in today’s coating standards and specifications have not been sufficient to define the adequate level of the abrasive blasting in order to provide wetting and adhesion of the pipe coatings to the pipe substrate, partially causing the pipeline coating disbondment. Adhesion mechanisms, limitations of the current standards of defining surface profile, and recommendations for future pipeline coating projects are discussed.
Key words: Abrasive blasting, surface preparation, pipeline coating, surface profile, test method
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This section of pipeline was in a high consequence area. Low flow, its narrow internal diameter, tight bends and plug valves made the pipe unsuitable for traditional smart pigging. Industry worked with pipeline service vendors to develop a suitable solution.