Development of the Innovative Technology for Aged House Pipes

Author(s) : Kensei INOUE, Mitsuaki TOKIYOSHI, Joji HINOBAYASHI, Takeshi KARINO, Toshinori KAWABATA, Takashi KURIYAMA

As the worldwide problems are over-population, unusual weather like as localized heavy rain and climate change. Against those problem, it has to need new projects to make a new agricultural field, drainage pipeline system and to spread the new underground irrigation system at peat land whereas spots of about 2 million...

Author(s) : Mitsuaki TOKIYOSHI, Gentaro TAKAHARA, Joji HINOBAYASHI, Toshinori KAWABATA, Takashi KURIYAMA

Glass fiber reinforced polyethylene pipes and fittings are controlled for bending characteristics (Strength and stiffness) for vertical and axial directions of pipe by spiral cross winding method. Generally, to use this method, it takes much stronger for vertical strength than axials cause of extruded direction,...

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...

Author(s) : Mitsuaki Tokiyoshi, Philippe Vanspeybroeck, Kensei Inoue, Stephan Fullgrabe, Takashi Kuriyama, Toshinori Kawabata, Joji Hinobayashi

Big diameter polyethylene pipes used an important role due to superior performance (Flexibility, light weight, long lifetime and tighten joint) for water and industrial supply to several countries. However according to standard concerned Polyethylene pipes as like ISO4427 we are being used solid wall pipe with too...

Author(s) : Jun Abe, Takahiro Kasatani, Yuji Higuchi

Osaka Gas has carried out the production, supply, and sale of gas since 1905 and has distributed gas to 7,200,000 customers. The piping used for distribution was originally steel and cast iron pipes, but we have been adopting the use of polyethylene piping for low pressure distribution since 1980, and have to date...

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...

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...

Author(s) : Kazuhisa Igawa, Yuji Higuchi, Akio Kamatani, Kazushi Yamada, Hiroyuki Nishimura

The polymer electrolyte fuel cells (PEFC) cogeneration system has been commercialized in Japan. The number of commercialized PEFC residential cogeneration systems have reached 100, 000 in total at the end of last year. The waste heat can be used for hot water supply and central heating. Hot water distribution pipes...

Author(s) : Yuji Higuchi, Kazuhiro Nishimoto, Takeshi Mise, Eiji Takenaka, Markus Hartmann

This study explores the Japanese market for polyamide 12 (PA12) pipes in terms of new product market success. To gain the market penetration, there are various entry barriers for the new product in the new market field which has big distance between current marketing areas and target country. In spite of becoming...

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...

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...

Author(s) : Takashi KURIYAMA and Norio HIMUKAI

In order to make clear the reliability of PVC-U recycled pipes in relation to the three-layer structure, we described the deformation and fracture mechanism of wall of pipes based on non-destructive techniques of scanning acoustic microscopy (SAM). The results showed that the multiple necking deformation occurred...

Author(s) : Takashi Kuriyama, Kenji Mizukawa, Hiroyuki Kurio, Hiroaki Sakamoto

The Great Hanshin Earthquake that occurred on January 17, 1995, caused devastating damages to a large number of architectural structures such as high-rise apartment houses, and civil structures such as roads and bridges. This earthquake triggered the review of the quake-resistance standards of buildings and civil...

Author(s) : Higuchi, Nakai, Hamada

To realize a polyethylene pipe with high strength and a high modulus of elasticity, a polyethylene based composite pipe was tentatively fabricated. To retain the plasticity of the composite pipe, polyethylene yarns were used as reinforcement. It was an interface-less composite because the reinforcement and the pipe...

Author(s) : Tominaga, Akiyama

Gas utilities are required to accurately understand the lifetime characteristics of gas polyethylene (PE) pipe in detail. Understanding the effects of varying temperature conditions is one of our goals, because the actual environmental temperature of PE gas pipe is not constant but varies. This is particularly true...

Author(s) : Akiyama, Kuriyama

The technical study group established by the Japan Gas Association examined the general design coefficient factor (C) to use polyethylene pipe to transport gas in Japan up to 0.3MPa. Because there are no results of the use of polyethylene pipe for gas in this high pressure range in Japan, we conducted a study...

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...

Author(s) : Kuriyama, Narisawa, Shiina, Kotaki

Unplasticized polyvinylchloride (PVC-U) is extensively used in the pressure pipe applications. These pipes are usually designed to have 50 year lifetime. Although their service performance is generally very satisfactory , there has been a number of cases where the pipes fail at unexpectedly short times. One of the...

Author(s) : Okamoto, Akiyama, Wasada, Komukai

Resistance of PE gas pipes to rapid crack propagation (RCP) was evaluated by S4 testing and a correlation of ductile brittle transition temperature between S4 testing and Charpy impact testing was investigated. S4 tests for Japanese domesticmade PE gas pipes (medium density) of five materials and three outer diameters...

Author(s) : Higuchi, Nishimura, Tamamura, Harada

To estimate the long-term performance of polyethylene pipe, molecular structure of polyethylene resin were analyzed and the long-term performance test were done. By linking the molecular structure of the resin to the results of long-term performance tests such as tensile creep tests and tensile fatigue tests, it...