Effect of Greenhouse Environment on Organics Migrating from Agricultural High-Density Polyethylene (HDPE) Pipes

2013 ◽  
Vol 11 (6) ◽  
pp. 1293-1297 ◽  
Author(s):  
Jia Liu ◽  
Haiye Yu ◽  
Lei Zhang ◽  
Gang Zhang ◽  
Jianwei Qu ◽  
...  
Keyword(s):  
High Density Polyethylene ◽  
High Density ◽  
Hdpe Pipes

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

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.

Pressure Effects on the Lifetime of Gas High Density Polyethylene Pipes

2021 ◽  
Author(s):  
Yang Wang ◽  
Hui-qing Lan ◽  
Tao Meng ◽  
Bing Wang ◽  
Du du Guo ◽  
...  
Keyword(s):  
Natural Gas ◽  
Induction Time ◽  
High Density Polyethylene ◽  
Reaction Rate ◽  
Low Pressure ◽  
Gas Pressure ◽  
High Density ◽  
Pressure Effects ◽  
Polyethylene Pipes ◽  
Hdpe 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.

Application of High Density Polyethylene Pipe (HDPE) in Same Floor Drainage System

2011 ◽  
Vol 99-100 ◽  
pp. 885-890
Author(s):  
Jie Tang ◽  
Ping Ping Xu
Keyword(s):  
High Density Polyethylene ◽  
Drainage System ◽  
Residential Building ◽  
Economic Benefits ◽  
High Density ◽  
Polyethylene Pipe ◽  
Building Project ◽  
Hdpe Pipes

This paper analyses the technology characteristics of HDPE pipes and UPVC pipes that used in drainage. Using a residential building project in Hangzhou as an example, it compares the economic benefits and comprehensive benefits of HDPE pipes with those of UPVC pipes. It concludes that it’s better to use HDPE pipes in same floor drainage system, and the using of HDPE pipes will bring benefits in the promoting of the same floor drainage system.

Short-term and long-term behaviors of buried corrugated high-density polyethylene (HDPE) pipes

2009 ◽  
Vol 40 (5) ◽  
pp. 404-412 ◽  
Author(s):  
Jun S. Kang ◽  
Taek H. Han ◽  
Young J. Kang ◽  
Chai H. Yoo
Keyword(s):  
High Density Polyethylene ◽  
High Density ◽  
Short Term ◽  
Hdpe Pipes

Parametric study of buried steel and high density polyethylene gas pipelines due to oblique-reverse faulting

2015 ◽  
Vol 42 (3) ◽  
pp. 178-189 ◽  
Author(s):  
Fayaz Rahimzadeh Rofooei ◽  
Himan Hojat Jalali ◽  
Nader Khajeh Ahmad Attari ◽  
Hadi Kenarangi ◽  
Masoud Samadian
Keyword(s):  
High Density Polyethylene ◽  
Numerical Study ◽  
High Density ◽  
Pipe Diameter ◽  
Pipeline System ◽  
Burial Depth ◽  
Reverse Fault ◽  
Pipe Material ◽  
Reverse Faulting ◽  
Hdpe Pipes

A numerical study is carried out on buried steel and high density polyethylene (HDPE) pipelines subjected to oblique-reverse faulting. The components of the oblique-reverse offset along the horizontal and normal directions in the fault plane are determined using well-known empirical equations. The numerical model is validated using the experimental results and detailed finite element model of a 114.3 mm (4″) steel gas pipe subjected to a reverse fault offset up to 0.6 m along the faulting direction. Different parameters such as the pipe material, the burial depth to the pipe diameter ratio (H/D), the pipe diameter to wall thickness ratio (D/t), and the fault–pipe crossing angle are considered and their effects on the response parameters are discussed. The maximum and minimum compressive strains are observed at crossing angles of 30° and 90°, respectively. It is found that the dimensionless parameters alone are not sufficient for comparison purposes. Comparing steel and HDPE pipes, it is observed that HDPE pipes show larger compressive strains due to their lower strength and stiffness. For both steel and HDPE pipes, peak strains increase with increasing D/t and H/D ratio for a constant pipe diameter and fault offset. For a given H/D ratio, compressive strains increase with increasing D/t ratio in HDPE pipes, while in steel pipes considered in this study, this effect is negligible. Finally, the peak strains of the pipes are compared to those suggested by Canadian Standard Association for Oil and Gas Pipeline System, CSA Z662.

scholarly journals Modeling benzene permeation through drinking water high density polyethylene (HDPE) pipes

2015 ◽  
Vol 13 (3) ◽  
pp. 758-772 ◽  
Author(s):  
Feng Mao ◽  
Say Kee Ong ◽  
James A. Gaunt
Keyword(s):  
Drinking Water ◽  
High Density Polyethylene ◽  
Distribution Systems ◽  
Water Distribution ◽  
Large Diameter ◽  
Small Diameter ◽  
High Density ◽  
Ethyl Benzene ◽  
Constant Input ◽  
Hdpe Pipes

Organic compounds such as benzene, toluene, ethyl benzene and o-, m-, and p-xylene from contaminated soil and groundwater may permeate through thermoplastic pipes which are used for the conveyance of drinking water in water distribution systems. In this study, permeation parameters of benzene in 25 mm (1 inch) standard inside dimension ratio (SIDR) 9 high density polyethylene (HDPE) pipes were estimated by fitting the measured data to a permeation model based on a combination of equilibrium partitioning and Fick's diffusion. For bulk concentrations between 6.0 and 67.5 mg/L in soil pore water, the concentration-dependent diffusion coefficients of benzene were found to range from 2.0 × 10−9 to 2.8 × 10−9cm2/s while the solubility coefficient was determined to be 23.7. The simulated permeation curves of benzene for SIDR 9 and SIDR 7 series of HDPE pipes indicated that small diameter pipes were more vulnerable to permeation of benzene than large diameter pipes, and the breakthrough of benzene into the HDPE pipe was retarded and the corresponding permeation flux decreased with an increase of the pipe thickness. HDPE pipes exposed to an instantaneous plume exhibited distinguishable permeation characteristics from those exposed to a continuous source with a constant input. The properties of aquifer such as dispersion coefficients (DL) also influenced the permeation behavior of benzene through HDPE pipes.

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