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Residual Life Assessment on Cast Iron Pipes of Water Distribution System  

Lee, Hyun-Dong (Korea Institute of Construction Technology Construction Environment Research Dept.)
Bae, Chul-Ho (Korea Water Resources Corporation, Korea Institute of Water and Environment)
Hong, Seong-Ho (Soongsil Uni. Env. & Che. Eng.)
Hwang, Jae-Woon (Korea Institute of Construction Technology Construction Environment Research Dept.)
Kwak, Phill-Jae (Korea Institute of Construction Technology Construction Environment Research Dept.)
Publication Information
Journal of Korean Society on Water Environment / v.20, no.3, 2004 , pp. 206-214 More about this Journal
Abstract
Residual wall thicknesses, corrosion rates, and residual life of thirty four samples of cast iron pipes(CIPs) and ductile cast iron pipes(DCIPs) collected from water mains of B city were studied to estimate their remaining service life or optimum time of rehabilitation. The internal maximum corrosion depths of samples measured using a dial gauge after shot blasting were twice higher than the external in most cases. Therefore corrosion of water pipes was much more affected by internal water quality than soil. Residual wall thicknesses of DCIPs were higher than those of CIPs. That reason was thought to be that DCIPs have been protected from internal corrosion by lining cement mortar. Residual life calculated by maximum corrosion rate was ranged up to 44 years with 12.40 years average. Since most CIPs were much deteriorated, rehabilitation plan should be established soon in B city. Residual life of DCIP was 33.52 years average. When cement mortar lining is used up by neutralization of DCIPs. DCIP also should be rehabilitated.
Keywords
Remining service life; Residual Life; Residual wall thickness; Corrosion rate;
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