Building and Water Industry
Plastic Pipes Conference Association # 1979 Brigthon
Hot water pipes made of peroxide and silane cross linked polyethylene have been tested comprehensively since 1974. The test programme includes long term hydrostatic tests of straight pipes at elevated temperatures in water, air and detergents. The influence of pipe bends, degree of cross linking, and antioxidant systems has been studied seperately.
The results predict a working life of 50 year8 below 60 C, more than 10 years at 80°c and about 4 years at 95 C. The tested materials were manufactured in 1974 but since then new and improved materials have been produced, and these are currently being tested. Results from this new material are more promising and higher working temperatures are expected to be possible in the future.
Author(s) : Jacob John, Andrew J. Ortquist, Mats Thunwall, Patrik A. Roseen
This study investigates production of crosslinked polyethylene (PEX) pipes using a resin obtained from a renewable resource via twin-screw extruder technology. PEX pipes were extruded using petroleum-based and renewable high-density polyethylene (HDPE) for comparison. Testing using relevant ASTM standards on the new...
Author(s) : Mats Bergman, Karin Jacobson
The Swedish Water & Wastewater Association (SWWA) has funded a R&D project to investigate different methods suitable for installation inspection of PE joints in field. Methods like phased array ultrasonic testing (PAUT), microwave technology and digital radiography were studied. Digital radiography shows promising...
Author(s) : Bergman
Polyethylene has now been successfully used as a pipe material for around 50 years. During this time, knowledge has been gained of the three main factors that influence the lifetime of the pipe system; material factors, environmental factors and loading factors, fig. 1. It is quite clear that today's PE pipe systems...