Antioxidant diffusion in polyethylene hot-water pipes.

From: Polymer Engineering and Science | Date: May 1, 1997| Author: Viebke, J.; Gedde, U.W. | Copyright information

This paper presents oxidation induction time (OIT) data for samples taken from a range of polyethylene hot-water pipes before and after hydrostatic pressure testing with internal stagnant water and external air. Linear relationships between OIT and antioxidant concentration were established for the antioxidants/polymers used. A model assuming Fickian diffusion of the antioxidant to the surrounding media and chemical consumption of the antioxidant (Regime B model) was applied to the OIT-profil...

Read all of this article with a FREE trial to HighBeam Research

Related newspaper, magazine, and journal articles from HighBeam Research

Antioxidant efficiency loss by precipitation and diffusion to surrounding media in polyethylene hot-water pipes.(International Forum On Polymers - 1996)
Polymer Engineering and Science ; INTRODUCTION This paper is a continuation of a series of papers (1-7) dealing with the deterioration and failure of polyolefin hot-water pipes. In this application there is a competition between yielding, craze fracture and chemical degradation (8). The former two are favored by extensive
New technology effective in reducing top-of-the-line corrosion rate.(Inhibitor Dispersal Pig Tested)(T.D. Williamson Inc. develops V-Jet)
Pipeline & Gas Journal ; In wet, sour, or carbon dioxide-containing multiphase gas production or gathering lines, top-of-the-line corrosion (TLC) can be a significant problem that may not be readily identified by conventional monitoring methods. While corrosion inhibitors are used to combat this problem, it is difficult to
Non-invasive flow metering methods for natural gas pipelines. (Measurement State Of The Art Review).(Brief Article)
Pipeline & Gas Journal ; Non-invasive measurement methods for pipelines have advantages over conventional invasive ones and this article reviews some well-developed non-invasive techniques with a brief explanation of principles. The non-invasive methods discussed herein include ultrasonic, thermal, optical and marker
Virtual pigging a 'reality.' (pipeline technology)
Pipeline & Gas Journal ; Pipeline Engineering & Supply Co. Ltd. of Catterick Bridge, Yorkshire, England and Brown & Root have recently used virtual technology to confirm the passage of a PE pipeline pig through a complex assembly of pipe bends. This is believed to be the first application of this technology in the
Effects of lightning on buried PE distribution pigging. (polyethylene gas pipes)
Pipeline & Gas Journal ; Concern has been raised about the possible role of tracer wire in increasing the incidence of lightning damage to buried polyethylene gas pipelines. Tracer wire, typically 14-gauge insulated copper building wire, is buried with polyethylene (PE) gas pipe to assist pipe detection using conventional