Pressure Effects on the Lifetime of Gas High Density Polyethylene Pipes

Abstract The purpose of this study was to propose low gas pressure effects on lifetime of natural gas high density polyethylene (HDPE) pipes by thermal-oxidative aging (TOA). The new method to assess the lifetime of HDPE natural gas pipes is based on gas pressure testing. An approach to monitor oxidative induction time (OIT) has been used to predict lifetime. Natural gas HDPE pipes were used to evaluate the effects of low gas pres-sures on oxidative induction time. In order to emphasize the pressure effects, relatively low temperatures at 45, 55, 65 and 75 °C were utilized for the exposure. The low-pressure conditions were created using air at levels of 0, 0.1, 0.2, 0.3 and 0.4 MPa. The property of high density polyethylene pipes was effectively moni-tored using the low pressure oxidative induction time (OIT) test. The results show that the aging reaction rate of high density polyethylene pipes increased exponentially with temperature and gas pressure according to the Arrhenius equation. Analytical models were developed to predict the aging reaction rate and lifetime of natural gas HDPE pipes.

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Structural Performance of Storm Water Detention System with Bundled High-Density Polyethylene Pipes

Transportation Research Record Journal of the Transportation Research Board ◽

10.3141/1845-20 ◽

2003 ◽

Vol 1845 (1) ◽

pp. 182-187

Author(s):

Steven L. Folkman ◽

A. P. Moser

Keyword(s):

High Density Polyethylene ◽

High Density ◽

Silty Sand ◽

Storm Water ◽

Crushed Stone ◽

Structural Performance ◽

Soil Columns ◽

Polyethylene Pipes ◽

Hdpe Pipes

Buried parallel pipes are used for storm retention systems. Traditional retention-detention systems have spaced parallel pipes that permit soil columns between pipes. A new design allows for the parallel pipes to be placed side by side in contact with each other. The performance of such a system of bundled high-density polyethylene (HDPE) pipes that is subjected to vertical earth loads is reported. This bundled system consists of parallel HDPE pipes wrapped with a geogrid and a geofabric. The actual loads ranged from shallow cover to vertical loads equivalent to 55 ft (16.8 m) of cover. The embedment soil selected for the research was a silty sand. This soil was selected because its structural qualities are generally considered to be the least acceptable for these types of applications. The soil that typically would be specified is a crushed stone. Therefore, the results from the tests are conservative. Structural performance is reported, and photographs present the pipes in the bundled system during installation and after subjection to earth loads. Load-deflection curves for the pipes in the system are also given.

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Study On Temperature Distribution In T Fittings - Polyethylene Natural Gas Pipes Assemblies

ACTA Universitatis Cibiniensis ◽

10.1515/aucts-2015-0066 ◽

2015 ◽

Vol 67 (1) ◽

pp. 67-72

Author(s):

Eugen Avrigean

Keyword(s):

Temperature Distribution ◽

Natural Gas ◽

High Density Polyethylene ◽

High Density ◽

Gas Distribution ◽

Influence Of Temperature ◽

Polyethylene Pipes ◽

Operational Safety

Abstract The present paper intends to approach theoretically and experimentally an important topic concerning the operational safety of the polyethylene pipes used in natural gas distribution. We discuss the influence of temperature in the high density polyethylene elbows during welding to the polyethylene pipes.

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Low pressure shock response and dynamic failure of high density polyethylene (HDPE)

10.1063/1.5044863 ◽

2018 ◽

Cited By ~ 1

Author(s):

Jennifer L. Jordan ◽

Dana M. Dattelbaum ◽

Benjamin F. Schilling ◽

Cynthia F. Welch ◽

Jamie A. Stull

Keyword(s):

High Density Polyethylene ◽

Low Pressure ◽

High Density ◽

Dynamic Failure ◽

Pressure Shock ◽

Shock Response

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Effect of flow forming on mechanical properties of high density polyethylene pipes

Journal of Manufacturing Processes ◽

10.1016/j.jmapro.2015.06.014 ◽

2015 ◽

Vol 19 ◽

pp. 155-162 ◽

Cited By ~ 9

Author(s):

Amin Abedini ◽

Payam Rahimlou ◽

Taghi Asiabi ◽

Samrand Rash Ahmadi ◽

Taher Azdast

Keyword(s):

Mechanical Properties ◽

High Density Polyethylene ◽

High Density ◽

Flow Forming ◽

Polyethylene Pipes

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MECHANICAL CHARACTERIZATION OF PA 12 AND HDPE PIPES BEFORE AND AFTER AGING IN WATER AT TWO DIFFERENT TEMPERATURES

International Journal of Research -GRANTHAALAYAH ◽

10.29121/granthaalayah.v9.i1.2021.2973 ◽

2021 ◽

Vol 9 (1) ◽

pp. 248-256

Author(s):

J.A. dos Santos ◽

R.C. Tucunduva ◽

J.R.M. D’Almeida

Keyword(s):

High Density Polyethylene ◽

Mechanical Performance ◽

High Density ◽

Effect Of Temperature ◽

Polyamide 12 ◽

Polyethylene Pipes ◽

Before And After ◽

Different Temperatures ◽

Deterioration Process ◽

Combined Action

Polymer pipes are being widely used by many industrial segments. Although not affected by corrosion, the mechanical performance of these pipes can be reduced due to exposure to temperature, UV radiation and by contact with various fluids. Depending on the deterioration process, embrittlement or plasticization may occur, and the service life of the pipe can be severely reduced. In this work, the combined action of temperature and water upon the mechanical performance of polyamide 12 and high-density polyethylene pipes is evaluated. Destructive and non-destructive techniques were used and the performance of both materials was compared. Both polymers were platicized by the effect of water. However, for high density polyethylene the effect of temperature was more relevant than for polyamide. This behavior was attributed to the dependence of the free volume with the markedly different glass transition temperature of the polymers and the temperatures of testing.

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Studies and Research on the Behavior of Polyethylene when Electrofusion Welding Fittings to High Density Polyethylene Pipes

Materiale Plastice ◽

10.37358/mp.21.1.5448 ◽

2021 ◽

Vol 58 (1) ◽

pp. 85-98

Author(s):

Eugen Avrigean

Keyword(s):

High Density Polyethylene ◽

Welding Process ◽

High Density ◽

Polyethylene Pipes ◽

The Way

This aim of this paper is to perform a study on the way the material of the fittings that can be welded through eletrofusion on polyethylene pipes withstands. The process is observed by means of the thermal and fast cameras. Also we intend to analyze the way the assembly consisting of the polyethylene fitting and pipe behaves during welding. The stresses caused by the welding process are observed, as well as the concurrent welding of the tapping tee and the branch saddle tee.

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