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With the rapid development of the economy and acceleration of urban modernization, many high-speed railways and buried pipelines have been built in China. Due to the limitation of space or geographical location, high-speed railways are often constructed in parallel or crossing with long-distance pipelines in some locations. The interference of high-speed railways on pipelines is the result of inductive and conductive coupling, which brings about AC corrosion and other safety issues.
Field measurements and corrosion coupon tests were carried out on a long-distance pipeline close to a high-speed railway. The spacing between the buried pipeline and high-speed railway is less than 500m and the parallel length of them is about 40 km. There are three intersections along the way, and the pipeline is subjected to dynamic AC interference. The AC and DC parameters were tested for 24 hours, and the dynamic interference characteristics were obtained by analyzing the tested data. In addition, corrosion coupons were buried at three locations along the pipeline. Through 11 months, the corrosion morphologies, corrosion products and corrosion rates of corrosion coupons under dynamic AC interference were obtained, and the correlation between dynamic interference parameters and corrosion behavior was analyzed, which provided a reference for corrosion risk evaluation under dynamic AC interference.
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A study of alternating current (AC) interference on cathodically protected pipeline from railway electrification systems was conducted with a continuous data logger developed specifically for the purpose.
Sour water stripping is used to remove ammonia (NH3) and hydrogen sulfide (H2S) from sour water streams coming from many operation units to condition it for discharge or reuse.1-3 In a complex refinery, most of the sour water comes from distillation, fluid catalytic cracking, catalytic reforming, coker and acid gas removal units, with many other operations contributing to the balance. The different streams are usually collected in a surge tank for centralized processing via a heat exchanger and a single stripper column, or two in series.