# 2004 Milan
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 considering the way that PE pipe is actually laid, and consequently selected 3.0 as the value of C.
Author(s) : Mitsuaki TOKIYOSHI, Gentaro TAKAHARA, Joji HINOBAYASHI, Toshinori KAWABATA, Takashi KURIYAMA 2018 Las-Vegas
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) : Mitsuaki Tokiyoshi, Philippe Vanspeybroeck, Kensei Inoue, Stephan Fullgrabe, Takashi Kuriyama, Toshinori Kawabata, Joji Hinobayashi 2016 Berlin
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) : Hiroyuki Kurio, Yuuji Yamamoto, Kenji Mizukawa, Takayoshi Yarimizu, Kentarou Nakata, Satoshi Saitou, Hisao Hirota and Takashi Kuriyama 2012 Barcelona
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 2010 Vancouver
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 2010 Vancouver
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) : Akiyama, Higuchi, Nose, Toyoda, Kitano, Kuriyama 2006 Washington DC
Since the year 2001, the Japan Gas Association has started the development of new renewal methods capable of cost reduction for modification work by inserting a new double-layered corrugated plastic pipe into the old gas pipe to encourage the modification of aged house pipes and upgrade the level of safety. The...
Author(s) : Tominaga, Akiyama 2006 Washington DC
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) : Kuriyama, Narisawa, Shiina, Kotaki 1998 Gothenburg
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 1998 Gothenburg
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) : Tanaka, Akiyama, Komukai 1995 Edinburgh
This paper describes the influence of residual chlorine in potable hot water on durability of cross-linked polyethylene and polybutene pipes. The aim of this study is to find and verify proper testing procedures and evaluation methods to estimate service lives of plastic pipes under different concentration of residual...
