Long Term Material Design Properties for Polypropylene Pipe Grade Resins

Papers # 2010 Vancouver

While polypropylene (PP) has been widely used in corrugated sewer pipe production in Europe for the past 25+ years, high-density polyethylene (HDPE) remains the dominant material for corrugated sewer pipe production in North America. As such, both short term and long term material design properties have been established for pipe grade (HDPE) for use in American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factored Design (LRFD) Section 12 Design methodology. With the investigation into the use of PP in North America, came the need for long-term material design limits for use in the AASTHO strain based design. While short term material properties are readily available, long-term properties such as 100-year modulus of elasticity, 100-year ultimate tensile strength, and strain limit are less known and specifications for determination of material properties poorly defined. This paper describes test protocols established for material property determination including Stepped Isothermal Method (SIM) testing for modulus and ultimate tensile strength determination, evaluation of design stress for modulus predictions, and physical product compression stub testing for establishing design strain limits.

Please note that the whole article content is available on PPCA website onlySource : 2010 Vancouver

Related papers

The use of temperature, lubrication, and supplied hydraulic pressure in the production of oriented PVC pipe

Author(s) : Jie Feng, Michael Petr, Jeff Wenzel, Mark Mirgon, Sam Crabtree, Alan Nakatani 2018 Las-Vegas

Through tensile tests, simulated orientation, tribology, and finite element analysis, this study explored the effect of temperature, lubrication and applied hydraulic pressure in the PVC orientation process. It was demonstrated that tight control of these parameters is critical in a continuous PVC orientation process...

Comparison Between the Stepped Isothermal Method (SIM) and Conventional Creep and Creep Rupture Tests on Polypropylene Used In Corrugated Drainage Pipe

Author(s) : Bill R. Vanhoose, Jarrett A. Nelson, Christa K. McNish, Richard W. Thomas 2014 Chicago

The Stepped Isothermal Method (SIM) is a form of Time-Temperature Superpositioning (TTS) that involves measuring the creep rate of a sample while it is subjected to a series of isothermal temperature steps. The accelerated temperature results can then be shifted back to room temperature to produce a master-curve....

Comparison of Creep Rupture and Creep Modulus Data for High Density Polyethylene and Polypropylene Pipe Resins Using Traditional and Accelerated Test Methods

Author(s) : Nicholas Piazza, Bill VanHoose, P.E. 2014 Chicago

In recent years, ASTM D6992 [1] has been and continues to be referenced as an acceptable test method for creep phenomenon in corrugated pipes. Example product specifications include AASHTO M330 [2], ASTM F2418 [3], ASTM F2736 [4], ASTM F2947 [5], ASTM F2764 [6], Washington DOT Standard Practice T 925 [7]....

Joining Methods for Thermoplastic lined pipelines

Author(s) : Ted Compton, Jeff Schell 2014 Chicago

For decades, energy companies have used thermoplastic liners to protect pipelines from internal corrosion and abrasion. Liner systems can be a simple and cost effective means to extend the life of an asset and protect the environment. Many advances in technology have occurred over the years and thermoplastic liners...

Long Term Creep Propterites of High Density Polyethylene and Polypropylene Pipe Grade Resins Based on Specimen Preparation Method

Author(s) : Bill R. VanHoose, P.E., Crista K. McNish, Nicholas Piazza 2014 Chicago

Material properties used in design of various plastic products should be representative of those present in the finished product. Impacts of processing, cure time, environmental conditions, etc. can considerably influence material properties in finished goods. While taking test specimens directly from finished goods,...

Replacement test for current buckling and ring flexibility tests

Author(s) : John M. Kurdziel & Bill Vanhoose 2012 Barcelona

Major standards organizations, such as ASTM International, ISO (International Standards Organization) and AASHTO (American Association of State Highway and Transportation Officials), have a test method for evaluating a plastic pipe’s wall stability and load capacity. The name of the performance test may be called...

Members of the Association

BOREALISBOROUGEFormosa Plastics CorporationINEOS O&PIRPCKazanorgsintez PJSCKorea Petrochemical IND. Co., LTD (KPIC)LyondellBasellPetroChina Dushanzi Petrochemical CompanyPRIME POLYMERSABICSCG Chemicals & Thai PolyethyleneSinopecTASNEE