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KMID : 0974620030210020459
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Bulletin of Dongnam Health University
2003 Volume.21 No. 2 p.459 ~ p.467
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A Study on Factors of Formation of out-worn Water Pipe in the Capital Area
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Hwang Sang-Yong
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Abstract
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This research was conducted for four months between September 1, 2003 and December 31, 2003 for the purpose of determining the cause of scale formation. Effect of rust water due to corrosion and scale on the change of water quality was examined and the tests on elution and corrosion rate as well as the structural examination by an optical microscope were carried out for each material. The results of the examination are summarized below: 1. Scale consisted of components such as calcium carbonate, spathticiron and iron oxides. 2. Elution test for residual chlorine showed decrease of 0.24mg/L in the Ø150mm KP ductile cast iron pipe. 3. Corrosion resistance in the corrosion rate test revealed 33.66-39.85mm/yr (average, 36.51mm/yr) in the KP-Joint of cement mortar lining ductile iron pipe. 4. The fine structural examination of pipes using optical microscope showed spheroidal graphites dispersed evenly in horizontal and vertical surface of the pipe in the cement mortar lining DCIP.
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KEYWORD
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