A Quality Control Test for Predicting the Lifetime of PE Pipes, Fittings and Resins [PE]

# 1992 Eindhoven

The test, called PENT, consists in measuring the resistance to slow crack growth of precisely notched specimens under constant load in air. The specimen geometry is designed and conditions are chosen so that failure is by slow crack growth as occurs under service in the field. The test conditions for producing failure in the minimum time are given. The correlation between the PENT lifetime and other test methods is presented. Also, the correlation between the PENT lifetime and the expected lifetime of a piping system in the field is presented. Finally, a minimum requirement based on the PENT test is suggested. A piping system that satisfies this minimum requirement is expected to last at least 100 years before a significant number of field failures occur.

Please note that the whole article content is available on PPCA website onlySource : 1992 Eindhoven


Related papers

THE TEST METHOD OF METALLIC ELEMENT FOR POLYETHYLENE PLASTIC PIPES OR MATERIALS FOR PIPES AND ITS APPLICATION

Author(s) : Xiaoying Lu, Yujie Wang, Qiang Huang, Chunyan Xu, Guangyu Zhu, Aimin Xiang, Linmei Wu, Yanfang Wang 2018 Las-Vegas

The determination method of metal elements for polyethylene pipes was reported in this paper, the difference in metal elements content between raw materials and recycled materials was analyzed. The results showed that raw and recycled materials in polyethylene pipes were effectively distinguished via metal element...

Comparison of Long-Term and Short-Term Tests for Electrofusion Joints in PE Pipes

Author(s) : Troughton, Brown, Hessel, Piovano 2006 Washington DC

As part of the Polytec Systems European-funded project, electrofusion (EF) joints in polyethylene (PE) pipe, containing different flaws, have been subjected to various standard and non-standard, long-term and short-term, coupon and whole pipe tests. The results were compared to determine which tests could...

DEVELOPING PE 100 RESINS WITH PAC TEST

Author(s) : N. Brown 2004 Milan

The three major requirements for a gas pipe resin are (1) the MRS , (2) excellent resistance to slow crack growth[SCG] and (3) resistance to brittle fast fracture as exhibited by a low S4 critical temperature,[Tc]. In order to develop a new PE resin, it is necessary to investigate many variables involving the...

Elastomeric Joint Comparison of PVC, VC and FCR Pipes

Author(s) : Lu, Burn, Whittle 1998 Gothenburg

For rubber ring joints to resist plant root penetration, it has been reported and promulgated into Australian Standards that a sufficiently high contact pressure between the rubber and the pipe must be maintained. The evaluation of the appropriate interfacial pressure to be used has been under discussion for some...

Impact Test for Preventing RCP

Author(s) : Brown, Lu 1998 Gothenburg

The S4 critical temperature (CT) for 110 mm pipe was correlated with the plane stress impact energy for 13 resins. A plane stress impact (PSI) test is offered as an inexpensive way to control RCP by determining the lot to lot variations of the critical temperature of a resin. Details of the PSI test are presented.

Long-Term Creep of ABS Pipes at Variable Temperatures

Author(s) : Lu, Burn 1998 Gothenburg

One of the characteristic behaviours of plastics (or viscoelastics) materials is the creep phenomenon, which is defined as the continuing deformation under a constant load with time. Although research on creep of plastics pipes has been widely carried out in other plastics, little work has been reported for creep...

Assessing mechanical properties of polymers for pipe application

Author(s) : Dear, Brown, Mason 1995 Edinburgh

The threshold load to just maintain crack propagation and conditions for catastrophic failure, should the material be loaded above this threshold, are two key evaluation requirements when assessing polymers for pipe applications. Often these assessments need to be made during material research and development and...

Molecularly Orientated PVC Pressure Pipes

Author(s) : Lowdon, Chantre, Brown 1995 Edinburgh

The Water Distribution Technical Centre Lyonnaise des Eaux operates a network of three water distribution technical centres which serve the needs of the Lyonnaise des Eaux Group in the area of potable water distribution technology. The main centre, known as the Water Distribution Technical Centre (WDTC), is based at...

The Validation of a PE for a Gas Pipe System

Author(s) : Brown 1995 Edinburgh

ASTM D2837 and ISO/TR 9080 for validating PE resins were analyzed. It was found that the difference between 11.3 yr. and 50 yr. as specified in D2837 and ISO/TR 9080, respectively, has very little effect on the determination of the Long Time Hydrostatic Strength (LTHS) at the service temperature, but...

The Failure of Polyethylene Gas Pipe Materials by Slow Crack Growth

Author(s) : Brown, Lu 1988 Bath

Two of the pipe resins that are commonly used in the USA are compared with respect to their relative life times. The improvement in the performances of the currently used materials compared to the older material from the same producer have been measured. T h e 1ahoratoi-Y conditions for producing brittle failure...

Members of the Association

BOREALISBOROUGEINEOS O&PIRPCKorea Petrochemical IND. Co., LTDLyondellBasellPetroChina Dushanzi Petrochemical CompanyPRIME POLYMERSABICSCG Chemicals & Thai PolyethyleneSinopecTASNEE
TOP