Our site uses cookies necessary for its proper functioning. To improve your experience, other cookies may be used: you can choose to disable them. This can be changed at any time via the Cookies link at the bottom of the page.


Experimental Investigations of the Rapid Crack Propagation Performance of Polyethylene Pipes [PE]

 

Plastic Pipes Conference Association # 2010 Vancouver

M.Lamborn

Good resistance to Rapid Crack Propagation (RCP) is considered to be important to the field performance of polyethylene (PE) pipe. Even though RCP occurrences in PE pipe are very rare, it remains important to understand the RCP phenomenon to ensure that pipes are designed to avoid RCP events. The characterization of RCP performance depends on a variety of factors, such as the test conditions (temperature and pressure), pipe geometry (diameter and wall thickness), and choice of RCP test. Presented here are an accumulation of results from various experimental programs undertaken by us to develop a basic understanding of RCP in PE pipes and the test methods used to characterize RCP performance. Data are presented showing critical pressure critical temperature failure surfaces for MDPE, HDPE, and bimodal HDPE pipe, and their use in the selection of RCP resistant pipe based on specific service conditions is discussed. Data are presented to demonstrate the phenomenon of false arrest and to show how this can lead to misleading and incorrect interpretations of RCP performance from single-point S4 tests at excessively high pressures. The results of experimental work to assess the influence of pipe size on S4 test results are also presented. Analysis of these data, combined with consideration of the effects of shear lips and residual stress effects, indicates that an Irwin-Corten relationship can be employed to provide conservative estimates RCP performance for different size pipe, subject to specific restrictions on the relative geometries between pipes.

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

Related papers

2018 Las-Vegas : Extrusion of thick wall pipes using a new bimodal PE 4710/PE 100 resin

Author(s) : Vivek Rohatg, Gregor Hiesgen, Mark J. Lamborn, Ashish M. Sukhadia, Douglas E. Simpson, David W. Borrego, Pamela L. Maeger

Maintaining dimensions within specifications is problematic for the extrusion of large diameter thick-wall polyethylene (PE) pipe (> 75 mm wall) due to sag caused by insufficient resin melt strength. However, sag can be controlled through careful resin selection and optimization of the pipe cooling process. This paper...

2014 Chicago : Rapid Crack Propagation – Observations of Critical Pressure and Critical Temperature Relationships of Polyethylene Pipes

Author(s) : Ashish M. Sukhadia, Mark J. Lamborn, Pam L. Maeger

Over the past several years, we have conducted extensive investigations of the Rapid Crack Propagation (RCP) behavior of Polyethylene (PE) pipes. While the typical data of interest is the Critical Pressure (Pc) and/or Critical Temperature (Tc), we chose to take our investigations further by exploring and generating...

2014 Chicago : The Effects of Dual Cooling on the Rapid Crack Propagation Performance of Polyethylene Pipes

Author(s) : Mark J. Lamborn, Pam L. Maeger, Rick E. Kunc, Vivek Rohatgi, Paul J. DesLauriers, Ashish M. Sukhadia

Dual cooling is a post-extrusion cool down process employed for polyethylene (PE) pipe, whereby either water or ambient air is forced through the pipe bore following extrusion, in order to accelerate cooling. The primary benefits offered by the dual cooling process are increased production rates and reduced resin...

2006 Washington DC : Rapid Crack Propagation Failures in HDPE Pipes; Structure-Property Investigations

Author(s) : Krishnaswamy, Leevers, Lamborn, Sukhadia, Register, Maeger

The influence of molecular architecture on the rapid crack propagation (RCP) resistance of a wide variety of high-density polyethylene (HDPE) pipes was investigated. It was concluded that high molecular weight, high crystallinity and a relatively narrow molecular weight distribution are important architectural...

2006 Washington DC : S4 Critical Pressure and Critical Temperature

Author(s) : Maeger, Vanspeybroeck, Lamborn, Mamoun, Leevers, Oliphant

As polyethylene pressure pipes enter the global marketplace under an ever-wider range of operating conditions, there is increasing emphasis on their rapid crack propagation performance. It is important that both producers and end-users are able to rely on the robustness of the rapid crack propagation test results and...

1998 Gothenburg : Time-Dependent Crack Growth in PE

Author(s) : Bradley, Slay, Self, Register, Lamborn

The crack growth rate in HMN 5202 and HXM 50100 polyethylcne has bcen studied as a function of stress intensity using deeply notched three-point bend specimens. l'he load-line displacen~entin response to a static applied load has been measured, with tlie material compliance as a function of time determined from the...

Members of the Association

BOREALISBOROUGEFormosa Plastics CorporationHanwha TotalEnergiesINEOS O&PIRPCKorea Petrochemical IND. Co., LTD (KPIC)LyondellBasellPetroChina Dushanzi Petrochemical CompanyPRIME POLYMERSABICSCG Chemicals & Thai PolyethyleneSinopecTASNEE
TOP