2016 Berlin : Development of the ring fatigue testing method for composite pipes
Author(s) : Yuji Higuchi, Rei Hyuga, Kazushi Yamada, Hiroyuki Nishimura
Recently, thermoplastic-based composite pipes have been developed in order to satisfy the higher requirements for gas and water distribution. Although the stress rupture test is now the major test method used to evaluate the long-term performance of these pipes, developing a new, convenient test method making it...
2016 Berlin : Evaluation of earthquake damage of PVC pipes for water distribution in japan
Author(s) : Yuichiro Goto, Hiroyuki Nishimura
The damage of PVC pipes caused by the great earthquakes was investigated in Japan by various organizations including public and private institutions. As a result of these investigations it is found that high-impact modified PVC pipes with the long insertion length have the least failures. Moreover it is also reported...
2016 Berlin : Latest technology of saddle scraper for polyethylene pipe
Author(s) : Takehiro Fujii, Hideo Hirabayashi, Kazushi Yamada, Hiroyuki Nishimura
It is important to stabilize the scraped surface of the polyethylene pipe, even if some operator scrape the surface of the polyethylene pipe. In Japan this automatic saddle scraper is widely used for improving workability and plumbing quality
The newly developed “Automatic saddle scraper” consists of the casing unit...
2014 Chicago : Countermeasures against Deterioration in Non-Cross-Linked Polyethylene Pipes
Author(s) : Kazuhisa Igawa, Yuji Higuchi, Daisuke Tanemura, Kazushi Yamada, Hiroyuki Nishimura, Sakiko Fukunishi, Kazufumi Kohno, Hidekazu Honma, Hidekazu Sugimori
Recently, as awareness about energy-saving is increasing, high-efficiency energy systems have been developed and introduced. In addition, public and private sectors have simultaneously been implementing various efforts aiming to improve their prevalence rates. These initiatives are represented by the Cogeneration Gas...
2014 Chicago : Development of the Ring Creep Test Method for Composite Pipes
Author(s) : Yuji Higuchi, Tomohiro Tanishita, Kazushi Yamada, Hiroyuki Nishimura
Recently, PE resin-back composite pipes have been developed in order to satisfy the higher requirements for gas and water distribution. Although the stress rupture test is now the major test method used to evaluate the long-term performance of these pipes, developing a new, convenient test method making it possible to...
2012 Barcelona : Estimation concerning the damage tolerance of plastic pipes by third parties
Author(s) : Yuji Higuchi, Masaaki Ishikawa, Toshiaki Furuno, Eiji Okamura, Masahiro Mutoh, Hiroyuki Nishimura, Asami Nakai, Hiroyuki Hamada
Pipe materials that are resistant to damage by thirty-party works were investigated with attention to materials already used for other purposes. Pipes for underwater cables, water service and agricultural use, both multiple-layer and single-layer types, were selected for the test. Protective materials were also...
2012 Barcelona : Estimation of surface void initiation of polyethylene pipes immersed in chlorinated water
Author(s) : Hiroyuki Kurio, Yuuji Yamamoto, Kenji Mizukawa, Takayoshi Yarimizu, Kentarou Nakata, Satoshi Saitou, Hisao Hirota and Takashi Kuriyama
In this paper, an acceleration test has been done to evaluate of the resistance of polyethylene pipes to the chlorinated water with varying the concentration of chlorine and test temperature. The surface defects like a void due to the delamination of film about 10-micron meter thickness were observed after the...
2010 Vancouver : Pultrusion Technique for Braided Fabric Reinforced Thermoplastic Composite Tube
Author(s) : Asami Nakai, Yoshitaka Tanaka, Akio Ohtani, Shigeyoshi Matsubara, Louis Laberge Lebel, Hiroyuki Hamada
Pultrusion process is one of the composite production methods that have been
used for mass production of uniform profiles. However, there are two problems
that are commonly found in pultrusion products; one of which is its anisotropic
mechanical properties. This anisotropicity stems from the alignment...
2001 Munich : Electrofusion Joint Strength of PE Pipes
Author(s) : Nishimura, Inoue, Inoue, Tani, Higuchi
Electrofusion (EF) joints have been widely used as easy-to-fuse and high-quality
joints for joining polyethylene (PE) pipes. When we introduced EF joints 150 mm or
more in diameter, an electrofusion simulation program was concurrently developed to
reduce time for design and experimental works. It was verified that the...
1998 Gothenburg : Development of EF Jointing Works
Author(s) : Yoshida, Kitaoka, Nishimura
Because dirt ( sand, mud, etc. ) on the fusion interface causes a decrease in the strength of
fusion joints, it is necessary to scrape and clean the pipe surface before fusion jointing.
We have determined the degree of dirt that causes a decrease in the strength of fusion
joints by experiments on peeling off at the...
1998 Gothenburg : Plastic Deformation Behavior of PE Pipes under Displacement
Author(s) : Nishimura, Macba, Ishikawa, Ueda
In the Great Hanshin-Awaji Earthquake, dthough leak and cracking occurred mainly in
joints of small-diameter steel pipes with screwed joints, no damage occurred to polyethylene
pipes. To secure aseis~uicresistance of gas pipeline, polyethylene pipes are expected to come
into wider use i n the future. To deternune the...
1995 Edinburgh : A study of rapid crack propagation in gas-pressurized PE pipes
Author(s) : Kitao, Hiarse, Nishimura, Inouge, Ishikawa, Otani, Miyasa, Kato
In this paper, the behavior of rapid crack propagation in gaspressurized polyethylene pipes was analyzed using the method in
which two characteristic curves, i.e., the crack velocity and the gas
decompression velocity, were compared. The crack velocity of
216mm outer diameter SDR13.5 medium density polyethylene...