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Influence of Residual Chlorine on Durability of Cross-linked Polyethylene and Polybutene Pipes used in Hot-Water Supply Systems [PEX, PB]

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 chlorine. The durability for residual chlorine contained in hot water at 353 K was investigated and the service life was estimated by Full Notch Creep Test under hot water containing residual chlorine. As a result, the higher the concentration of residual chlorine was, the shorter the time to failure was, and there was a certain relationship among the concentration of residual chlorine, time to failure and applied stress.

Please note that the whole article content is available on PPCA website only

Author(s) : Tanaka Hiroaki

Polyethylene (PE) pipes for gas supply, which have been widely used in recent years, have superiority in installability, seismic performance and corrosion resistance, while their resistivity against external force such as from strikes by excavator bucket edges is inferior to metal pipes. Under some installation...

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...

2006 Washington DC : Development of the Innovative Technology for Aged House Pipes

Author(s) : Akiyama, Higuchi, Nose, Toyoda, Kitano, Kuriyama

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...

2006 Washington DC : Research of PE Pipe's SCG Characterization under Varying Temperature Conditions

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...

2004 Milan : Setting the Value of the Design Coefficient for A 0.3MPa Gas Supply Use PE Piping System in Japan

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...

1998 Gothenburg : Evaluation of RCP resistance for Japanese domestic-made PE gas pipes by S4 test and Charpy impact test

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...