A fire-tube boiler made from carbon steel in which fuel gas flows within the tube while...

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Mechanical Engineering

A fire-tube boiler made from carbon steel in which fuel gasflows within the tube while the boiler feed-water along withcondensate from the plant flows on the shell-side. Visualinspection revealed heavily localized tubercles were seen on theoutside surface of several tubes. After about 11 months ofoperation, the pipe was leaked and visual inspection found pinholes outside surface contain loose brownish rust. The rustcontained chloride and was acidic in nature. Select appropriatecorrosion prevention to apply and identify types of corrosionhappen.

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There are seven types of chemically induced corrosion failures general corrosion pitting corrosion stress corrosion dezincification galvanic corrosion crevice corrosion and condensate grooving 1 General Corrosion This type of corrosion is characterized by a relatively uniform attack over the tube tube sheet or shell and there may be no evidence that corrosion is taking place Fairly stable aggressive conditions generate this type of attack Low pH less than 7 combined with carbon dioxide or oxygen produces the attack on copper The blue or bluishgreen color on the tubes are the results of carbon dioxide attack on the inside of a copper tube Various chemicals such as acids also produce this type of metal loss Selecting a material with adequate corrosion resistance for its environment along with using proper treatment chemicals maximizes heat See Answer

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