Materials Performance Supplements

PIPELINE 2019

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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16 JUNE 2019 W W W.MATERIALSPERFORMANCE.COM CORROSION MANAGEMENT FOR PIPELINE INTEGRIT Y SUPPLEMENT TO MP Composite repair products used in oil and gas pipeline rehabilitation and restoration applications have been available for close to 30 years, but some operators and asset owners in the oil and gas industry are apprehensive when it comes to using or expanding the use of them—not because of the performance of these products, but because of the limited amount of unbiased information that is available for them. The rare stories of some composite repairs not meeting expectations further compound the issue, but these are often due to improper product selection or product installation. There are plenty of manufacturers that would have operators believe their products are adequately manufactured to handle any repair based on their one-size-fits-all construction. In reality, these types of products can provide a good repair solution only in the right conditions, but even then, that doesn't necessarily make it the right or the best option. There are many variables when considering a composite repair, including operating pressures and temperatures, defect type and severity, pipe geometry and external or internal chemical presence. Considering all these vari- ables, it is near impossible for a single, ready-made composite to work well in any situation. "Pre-designed," ready-made repair products should only be used to address very specific situations. These situations and lim- itations should be clearly and plainly understood. However, keep in mind that the prevailing ASME PCC-2 and ISO 24817 standards state that each repair should be properly designed in accordance with the standards. On the other hand, manufacturers of a truly engineered composite repair product should be able to explain how the engineering of said product will address the specific problem being considered. Finding a product that is engineered to the exact specs of a given scenario will not only offer the optimum design required to provide a sufficient repair, but it can also reduce costs. Additionally, there are many other conditions, such as bending or combined loading, that the repair must address. This is more likely to be done if the repair is custom designed versus assuming an off- the-shelf product has pre-considered these loads. Some manufacturers may pitch the low number of layers that comes standard with their composites as a key benefit; however, layer count is not necessarily as important as total repair thickness and how the system addresses certain stress loads such as bending. If a composite decision is made solely on the basis of its constant repair thickness (layer count) alone, the results could be costly. Having more material (constant repair thickness) than necessary will mean purchasers are paying for material they don't need. If the operator decides to err on the side of perceived expedience, depending on the product type and kit, the repair could consist of too thin a composite, resulting in a repair that could potentially fail. This scenario means a second repair is imminent and adds costs that could have been avoided with an initial proper solution. For more information on composite repair methods, read our white paper or visit our web site. Composite Repair Considerations Milliken Infrastructure Casey Whalen Engineering Supervisor Email: infrastructure@milliken.com Tel: +1 281-999-7100 Web site: Infrastructure.milliken.com

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