Plastic Pipes Conference Association # 2021 Amsterdam
Mitsuaki Tokiyoshi, Yuichi Shibao, Yoshitaka Watanabe, Takeshi Yoshioka, Takashi Oka, Kohei Sasaki
It was common to use those pipelines for Steel in Japan. However Steel pipes have the long standing problems that it has been needed maintenance costs for rust prevention and antifouling property. Therefore it had been carried out the project that large diameter polyethylene pipeline applied for circulating water pipes in 2018. Electric Power Development Co.,Ltd (J-POWER) had been replaced of the existing Unit One and Two combined of coal fired generation plant in Takehara city at Hiroshima Prefecture in Japan. Total lengths of intake water pipeline were taken 131m, operating pressure 0,095MPa applicable to intake water pipelines, and discharge water pipelines were 65m length. It would be provided Profile wall polyethylene pipes by spiral winding method specified JIS K 6780. Pipes diameter/length was given 3.0m DN/ID, 5m each by based on PE80 materials. Those pipes could be customized the suitable structural design what it shall be the best according with specification design on the job site. The fittings are basically welding systems like as Electrofusion, Butt fusion and automatically welding systems, furthermore it can be provided rubber joint system and flange system to consideration for usage, design condition and ground design. To consider internal pressure, fittings of discharge pipeline was automatically welding systems, on the other hand fittings of intake pipeline was rubber joint system due to not internal pressure. The paper will be introduced investigation and research resolution on this project as follows.
_Research for biofouling (PE80, Steel and GRP surface in ocean immersion test. (Under examination)
_Water filling test into hollowed core for sedimentation in the sea
_Research the comparison of the generated stress with structural wall and solid wall
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