Additional Information - Posters
Plastic Pipes Conference Association # 1998 Gothenburg
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 (100, 150, and 200 mm, SDR 13.5) were carried out at temperatures from -30 "C up to 10 "C. A critical pressure that is the highest pressure at which the crack will not propagate and a critical temperature above which RCP does not occur were obtained by S4 tests. And S4 critical temperature correlated with ductile brittle transition temperature by the Charpy impact test.
S4 critical pressure and temperature were influenced by materials and pipe diameters. Ductile brittle transition temperature using the Charpy impact test was affected by materials, sampling position and direction from pipe and dimensions of specimen. An order of RCP resistance for each material by S-l critical temperature and ductile brittle transition temperature using the Charpy impact test was observed rough intensity.
Author(s) : Atsushi Shimoda, Masahiko Okumura, Tadashi Okamoto and Takeo Kuroda
Applying fiber-reinforced plastics to pipes can be effective to form pipes which are light, thin and high strength. Basically, the forming process of thermo plastics consists of melting and cooling. Compared to the forming time of thermoset plastics (FRP), it’s easy to fuse. Therefore, applying fiber-reinforced...
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...
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) : Tanaka, Akiyama, Komukai
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...