Cavitation erosion of low-density polyethylene coatings for pipe liners

9th International Symposium on Cavitation

Hattori, S.^1 ; Benitani, E.^1 ; Ruan, W.^1 ; Suda, Y.^2 ; Takeuchi, R.^2 ; Iwata, T.^2

Graduate School of Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui-shi, Fukui

910-8507, Japan^1

Mitsubishi Heavy Industries, LTD., 1-1, Wadasaki-cho 1-chome, Hyogo-ku, Kobe

652-8585, Japan^2

关键词: American society for testing materials;    Cavitating liquid jet;    Chloroprene rubber;    Erosion rates;    Experimental conditions;    High molecular weight polyethylenes;    Low density;    Testing materials;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/656/1/012048/pdf
DOI  :  10.1088/1742-6596/656/1/012048

来源: IOP

【 摘 要 】

The relationship between mechanical properties and the erosion rate was examined for chloroprene rubber and a number of polyethylene materials produced by different methods. As electric power plants are in operation over long periods of time, the effect of aging was also examined by testing material intended for use in pipes in electric power plants. Cavitation erosion tests were carried out by using a flowing apparatus as specified in the American Society for Testing Materials G134-95 standard. A flow velocity of 150 m/s and a test time of 24hours, were the experimental conditions used for a cavitating liquid jet test on polyethylene. The maximum depth of erosion rate (MaxDER) of polyethylene was found to decrease with the increase in hardness. Among all the tested materials, the relatively high molecular weight polyethylene with low density (m-LLDPE-H), showed the best resistance to cavitation erosion in terms of MaxDER. The effect of aging on the erosion rate of polyethylene was limited.