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In a copper hot water system, a bent pipe was soldered into a straight pipe with twice the diameter. The neighborhood of the soldered joint was covered with corrosion product predominantly blue-green in color, presumably carbonates. When these corrosion products were scratched off it was seen that the copper beneath this layer had not suffered noticeable attack. The object of the examination was the localized deep cavities located almost symmetrically to both sides of the inserted end of the narrower tube on the internal wall of the wider tube which had in one place been eaten right through. The...

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