What caused mineral scale buildup inside early locomotive boilers?
Answer
The use of untreated water containing impurities
Early steam locomotive boilers were susceptible to internal issues caused by the quality of the water they used. Water sourced from natural environments often contained minerals and various impurities that, when heated, would precipitate out and form a hard scale on the interior of the boiler tubes and shells. This scale served as an insulator that blocked heat transfer from the firebox to the water, forcing the engine to work harder. Additionally, this buildup could create dangerous hot spots on the boiler metal, increasing the risk of structural failure over time.
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