| Title |
Assessment of Service Water Pipes in the Building by the Direct Diagnosis Method |
| Authors |
이현동 ( Hyun Dong Lee ) ; 배철호 ( Chul Ho Bae ) ; 박정훈 ( Jeong Hoon Park ) ; 홍성호 ( Seong Ho Hong ) |
| Abstract |
Service Water Pipes (Galvanized Steel Pipe) were assessed by the direct diagnosis according to major water basins, period of water supply, and diameter.(A) Tubercle growth rate and rate of hydraulic cross sectional capacity reduction calculated on the basis of visual assessment showed that there was no prominent difference in major water basins, but tubercle growth rate and rate of hydraulic cross sectional capacity reduction in comparison of period of water supply, the period of water supply more increased, on the contrary, their rates were tend to be more decreased. And their rates were tended to be higher over 40A of diameter. In physical properties analysis, sampled GSPs of 90% were not appropriate to KS Standard of elongation. But most of sampled GSPs were appropriate to KS Standard of tensile intensity. All of sampled GSPs also were appropriate to KS Standard of chemical composition (P, S). Therefore it was thought that elongation was much more effected by deterioration of pipe in physical properties and chemical composition of sampled GSPs. Results of scale composition analysis of sampled GSPs showed that the content of Fe was form 54.3% to 69.8%. Zn was from 0.09% to 6.34%. In comparison of corrosion rates on major water basins, maximum corrosion rate of NRB (0.064 mmpy) was higher than that of other basins. But the results showed that corrosion rates of sampled GSPs were similar according to period of water supply. And the diameters of sampled GSPs were more increased corrosion rates also were more increased. |