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Submitted By Fanniecao
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Water is the main concern. If there's only a little bit of water in the oil, or if the oil is flowing fast enough, you generally won't have a problem. That's because the water will be dispersed in tiny droplets that are suspended in the flow. These suspended droplets won't react much with the steel surface of the pipes.

Problems can arise in stretches of pipeline that run at lower pressures. In these spots, water droplets can coalesce and fall out of the oil flow. They might inundate globs of sand or dirt that have also fallen out of the crude-oil mix and form a watery sludge on the edge of the pipe. Once a watery muck forms in one part of the pipe, the natural process of corrosion speeds up. The crude can also serve as a breeding ground for anaerobic bacteria, which form slimy, sulfur-producing colonies on the inside of the pipe.

To make matters worse, crude oil comes out of the ground hot, and the pipelines are insulated to maintain those high temperatures. Oil flows better when it's hot, but heat also exacerbates corrosion within the pipes.

Sometimes the oil companies introduce corrosive bacteria, water, or gas into reservoirs themselves. When an oil field gets old, it starts to lose pressure, and it becomes harder to draw out the remaining crude. Engineers can try to add pressure underground by putting in seawater or carbon dioxide. While this increases the field's output, it also sours the product and leads to more pipeline corrosion.

Solution: 1, Offshore structure:

2, Coating
Pipeline Corrosion Protection Solution with a variety of functional pipe coatings for both internal and external use, as well as in-the-field rehabilitation applications for girthweld/field joint coatings. Withstand harsh chemicals to extend the life expectancy of your equipment – and help to ensure a more reliable operation.
Internal Pipe Coating
3M™ Scotchkote™ Liquid Epoxy Coatings provide corrosion protection for steel pipeline interiors, fittings and other equipment.

External Pipe Coating
3M™ Scotchkote™ Fusion Bonded Epoxy Coatings provide maximum external protection for underground or subsea steel pipelines

3, Repair
Pipeline repair/rehabilitation systems can be considered in four broad categories: (i) Systems that will limit the future growth of corrosion features. Internal linings and biocides are examples of this type of system. (ii) Repairs that are designed to restore the strength of the pipe containing a part wall defect, such as a gouge that might be caused by external interference. The Clockspringô composite wrap is a good example of such a system[6] . (iii) Repairs that are designed to contain the transported fluid in the event of the defect failing. The Plidcoô leak clamp is an example of such a system
(iv) Repairs that will restore the strength of the pipe and contain the transported fluid in the event of the defect failing. The ‘type B’ welded shell is an example of this type of repair

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