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PPI TN-21

2013 Edition, January 1, 2013

Complete Document

PPI PENT Test Investigation



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Active, Most Current

EN
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Product Details:

  • Revision: 2013 Edition, January 1, 2013
  • Published Date: January 2013
  • Status: Active, Most Current
  • Document Language: English
  • Published By: Plastics Pipe Institute (PPI)
  • Page Count: 8
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

The purpose of this project was to evaluate applicability of the PENT test (ASTM F 1473 "Standard Test Method for Notch Tensile Test to Measure the Resistance to Slow Crack Growth of Polyethylene Pipes and Resins") for slow crack growth determination of polyethylene (PE) resins and extruded solid wall pipe. The PENT method was also evaluated as a quality control (QC) indicator for extruded pipe. PENT has been identified as a potential test protocol to supplement 80°C hydrostatic testing of PE pipe resins.

The evaluation included the compression molded plaques under slow cooled condition that were further prepared by machining and band sawing, and longitudinal samples cut directly from the wall of extruded pipe along the pipe direction. Testing included numerous laboratories and several commercially available medium density gas pipe resins. The resins chosen were 1st generation resins with significant long-term field experience.

A number of extrusion conditions were also evaluated to determine if the PENT test has applicability as an extrusion quality monitor.