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The exchangers on the top of tower exposed to wash erosion seriously when Shengli refinery processed Middle-east crude oil. Used grey system theory, aimed at general tube-shell exchangers and helix-baffled structure, tube of 20 carbon steel with TH847 coating, 20 steel aluminizing, 316L and dual phase steel, carried on grey decision. For exchangers rebuilding project, grey target decision shows that...
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