Plastic Pipes Conference Association # 2021 Amsterdam
Shuhei Nishida, Shintaro Iwasaki, Hidefumi Yamanaka, Takahiro Kasatani
Polyethylene pipelines have been used for natural gas service applications for over 40 years in Japan. It is thought that they will continue to be used widely for many years. Therefore, it is important to confirm the conditions of the existing pipelines being used for the long term. In this study, polyethylene pipes comprising two types of resin and installed for a long term (more than 30 years) in Japan were investigated. Certain physical properties of these polyethylene pipes (such as the Charpy impact strength and melt mass flow rate (MFR)) changed in comparison with the properties of unused pipes of the same age. In contrast, the results regarding the full notch creep test (FNCT) of these pipes were approximately equal to those of the unused pipes. These results suggest that although the physical properties of polyethylene pipes buried for a long period of up to 30 years changed, the creep characteristics, which are more important for the life of the pipes, hardly changed. Therefore, these polyethylene pipes can be used for years to come.
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