Selection of materials for cured in placed pipe to rehabilitate water distribution pipe

The need for rehabilitation of water system in many cities is rapidly growing. It is caused by their age, breaking accidents, and limited ability to transport the increasing volume of required water usages. So many trenchless methods such as epoxy lining, ceramic mortar lining, CIPP, slip-lining etc. have been developed and used for the cost and environmental advantages The CIPP method, although it has the intensity as the pipe, the safety assessment in using this method for the drinking water has not cleared and experience of construction for the water mains is very rare in Korea. This study was intended to survey present state of trenchless technology in Korea and to experiment physical and chemical properties of the materials used for CIPP. For the confirmation of intensity, tensile and flexural intensities of three unsaturated polyester resins with two hardening agents and one accelerator were measured. And the extraction test with drinking water was performed according to NSF/ANSI Standard 61. The resistance of the CIPP against some chemicals such as chlorine and nitric acid, sodium hydroxide were also measured. Microorganism formation effect on CIPP was compared with that of DCIP. The test results of the CIPP showed that CIPP would be proper to water distribution material. Finally, through the results, the application of CIPP for water main rehabilitation will be acceptable.