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.


Comparison of FNCT vs. PENT as commonly Used Test Methods for ESCR Performenc of HDPE [PE]

 

Plastic Pipes Conference Association # 2010 Vancouver

S.Joseph

Companies of LyondellBasell FNCT (Full Notched Creep Test, ISO DIS 16770-3) and PENT (Pennsylvania Notch Test, ASTM F-1473) are commonly used test methods to measure the stress-crack resistance of polyethylene resins used in pressure pipe applications. FNCT test is primarily used in Europe whereas the PENT test is used in North America. The advent of high-performing bimodal and multimodal polyethylene resins has resulted in a step-change increase in FNCT and PENT failure times. End-use applications have also begun to incorporate requirements that represent a higher level of performance. For instance, in Europe the DVGW requirement for sandless bedding of water pipes requires FNCT > 2700 hours, and proposed regulations for PE pipe in nuclear plant secondary cooling-water applications in North America require PENT > 2000 hours. Accelerated versions of the FNCT test have been developed to reduce failure times by an order of magnitude. An increase in stress and or temperature in the PENT test provide a smaller degree of acceleration. An investigation into the potential correlation of PENT failure times with accelerated FNCT test failure times is conducted in this paper, in order to determine whether the FNCT test can be used as a QC tool for high-performance polyethylene pipe resins.

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

Related papers

2021 Amsterdam : UK WATER INDUSTRY RESEARCH REVEALING THE LONG- TERM AGEING PERFORMANCE OF POLYETHYLENE (PE) PIPES

Author(s) : Patrick Campbell, Joanne Claronino, Shana Meeus, Joseph Sanders, David Chrystie-Lowe

Polyethylene (PE) potable water mains, with design life of 50 years (BS EN 12201), have been in widespread use in the UK water industry for more than 30 years. PE pipe is light, flexible and reliable in comparison with other pipe materials and the UK water industry has made a considerable investment in replacing...

2016 Berlin : Sodium hypochlorite dosing for zebra mussel abatement using double contained advanced PE

Author(s) : Kim Endsley, Joseph Poniatowski

In order to free itself from the rising costs of water supplied by the Detroit Water and Sewerage Department, the Karegnondi Water Authority proposed a new water intake and delivery system from Lake Huron to Flint, Michigan. Because of the recent introduction of the zebra mussel into North America’s Great Lakes, a...

2012 Barcelona : Development of an enhanced chlorine resistant antioxidant package for potential use in polyethylene using a rapid LC-MS technique

Author(s) : Joseph Sebastian

The development of an antioxidant package for chlorine resistance of polyethylene pipe is a time-intensive exercise. The usual testing protocol consists of compounding a number of different additive packages into polyethylene, preparing molded samples and then aging these samples in a sodium hypochlorite bleach...

2006 Washington DC : Taking Slow Crack Growth - Rapid Crack Propagation Balance of Biomodal PE100 Resins to the Next Level

Author(s) : Reinking, Mehta, Garrison, Joseph, Schwab

Bimodal polyethylene (PE) pipe resins have demonstrated a step change in slow crack growth (SCG) and rapid crack propagation (RCP) resistance over conventional unimodal polyethylene resins. Literature shows that homopolymer polyethylene has higher RCP resistance than PE copolymers, which suggests a trade-off between...

1979 Brigthon : Pressure Fatigue Testing of Plastics Pipes

Author(s) : Joseph

The construction of apparatus for cyclic pressure fatigue testing of 60 mm and 168 mm diameter plastic pipes is described. The results of tests at 1 Hz at 20°C and at 10°C at various stress amplitudes and mean stress levels are given for 60 mm diameter uPVC pipe. A comparison is made between specimen lifetime and...

Members of the Association

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