An Alternate Method for Determining the Hydrostatic Design Basis for Plastic

Posters - Additional Information # 2001 Munich

The Alternate Methods Committee of the Plastics Pipe Institute’s Hydrostatic Stress Board (HSB) has completed development of an alternate method for determining the hydrostatic design basis (HDB) for plastic piping materials. The initial work was reported at Plastic Pipes X, in Sweden in 1998.1 An ASTM test method has also been developed, ASTM F 2018, “Standard Test Method for Time-to-Failure of Plastics Using Plane Strain Tensile Specimens.” This test method generates a Strength Design Basis or SDB, which will be included in PPI TR-3 and TR-4 for moulding applications. This work is based on a method developed by Choi and Broutman,2-4 and has been successful in generating an SDB that is the same as the HDB determined from testing pressurized pipe specimens. The plane-strain tensile specimen is grooved on both faces to create a biaxial stress in the groove area. The biaxial stress achieved in the test specimen closely approximates the biaxial stress ratio found in pressurized pipe specimens. The samples are loaded in uni-axial tension at different stress levels until failure (creep-rupture). The data are then analysed per ASTM D2837 or ISO 9080, similar to hydrostatic pressure test data.

Please note that the whole article content is available on PPCA website onlySource : 2001 Munich


Related papers

ISO 13477 S4 TESTING OF AWWA C900 PVC PIPE

Author(s) : Sunwoong Choi, Tom Marti 2016 Berlin

Small scale, steady state (S4) testing per ISO 13477 is a lab-based procedure to determine the critical pressure at which a fracture will propagate following initiation in a given pipe material filled with a given test medium. The S4 test was originally developed for the natural gas industry using air as the test...

Determining the Processing Quality of PVC Pipe by DSC – How Precise?

Author(s) : DALE B. EDWARDS, ANAND R. SHAH, DONALD E. DUVALL 2014 Chicago

Differential scanning calorimetry (DSC) has been used to study the processing of PVC pipes. This work has been largely embodied in ISO 18373-1-2007, Rigid PVC Pipes –differential scanning calorimetry (DSC) method – Part 1: Measurement of the processing temperature and Part 2: Measurement of the enthalpy of fusion...

Utilization of Notched Ring Test for larger diameter pipes and fittings

Author(s) : Sooho Pyo, Junghyun Nam, Yoonsang Kim and Sunwoong Choi 2010 Vancouver

The Notched Ring Test (NRT) has been recently developed to measure slow crack growth (SCG) in plastics pipes and fittings. The NRT specimen in the form of a notched full ring is directly obtained from the extruded pipe or injection molded fitting and has demonstrated its effectiveness in generating slow crack growth...

Development of Notched Ring Test for Measuring Slow Crack Growth

Author(s) : Pyo, Seo, Mutter, Broutman, Choi 2006 Washington DC

A novel Notched Ring Test (NRT) method for measuring slow crack growth (SCG) in plastics pipes and fittings is developed and applied to determine its applicability as the standard test method. NRT specimen in the form of a notched full ring, directly obtained from the extruded pipe or injection molded fitting...

Manufactured Aggregate as Imported Backfill Material for Plastics Pipes

Author(s) : Newport, Wijeyesekara, Edwards 2004 Milan

Research work undertaken at the University of East London has produced new forms of sustainable manufactured aggregate, which gives a backfill material which has many advantages over natural materials. The unique geotechnical properties of the aggregate make it an idea material for the laying of plastic pipes allowing...

Cable Drawing Trough Deformed Plastic Ducts

Author(s) : Fairfield, Reid, Hounsome, Edwards, Sibbald 2001 Munich

This paper provides estimates of the draw force needed to pull sub-ducts or cables through a series of typical ducted utility networks. Variables such as : coefficient of friction between the outside of the cable and inside of the duct, the main duct’s vertical diameter, the cable bundle or sub-duct’s...

Complex Yield Behaviour of PE100 Resin on Plane Strain Tensile Specimen

Author(s) : Choi, Lee, Broutman, Edwards, Palermo, Cho, Choi, Park 2001 Munich

In recently designated plane strain grooved tensile (PSGT) methodology of ASTM F2018 standard, a groove in the direction perpendicular to the loading axis allows biaxial stress state to be generated under a uniaxial loading. The biaxial stress state produced very closely approximates the internally pressurized pipes...

An Alternate Method for Determining the Hydrostatic Design Basis for Plastic Piping Materials

Author(s) : Broutman, Edwards, Shah, Palermo 1998 Gothenburg

The Alternate Methods Committee of the Plastics Pipe Institute's Hydrostatic Stress Board (HSB) has initiated development of an alternate method for determining the hydrostatic design basis (HDB) for plastic piping materials. After reviewing several test methods, the plane-strain tensile method, developed by Choi and...

Plastics Pipes - Future in the Water Industry

Author(s) : Stokes, Edwards 1998 Gothenburg

The paper examines the business and regulatory background to the infrastructure investments anticipated in the next few years, from the point of view of a major UK Water Company. Past performance of the use of plastic pipes for sewers and water mains are examined. Shortcomings of the products are identified and...

Predicting long term pipe strength by uniaxial tensile testing

Author(s) : Choi 1995 Edinburgh

A plane strain specimen has been developed which creates a biaxial stress state when loaded in uniaxial tension. A detailed stress analysis of this specimen is presented. The stress state was generated though the use of a groove across the width of the specimen. Both theoretical and experimental results are presented....

Evaluation of Aged Plastics Pipes Used in Natural Gas Distribution Systems

Author(s) : Duvall, Nylander, Broutman 1988 Bath

Thermoplastic gas distribution piping has been utilized in the United States for over 25 years. However, there is little data available on how such materials age in a service environment and how such aging might affect future performance. In this program, polyethylene pipe samples that were removed from actual gas...

Extrudate Cooling of Medium Density Polyethylene Pipe Sections

Author(s) : Edwards,Ellis, Georghiades,Smith 1982 York

A model is presented for the prediction of cooling rates and temperature profiles during the cooling and solidification of M.D.P.E. pipes. Experimental measurements from an industrial production line are reported and these confirm the predictions of the model. Finally, the model is used to determine the most important...

Determination of Interfacial Pressure in Crimped Fitting Assemblies

Author(s) : Choi 2008 Budapest

Members of the Association

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