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Time Dependent Response Of Pulled In Place Hdpe Pipes
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Book Synopsis Time Dependent Response of Pulled-in-place HDPE Pipes by : Abdul Ghafar Chehab
Download or read book Time Dependent Response of Pulled-in-place HDPE Pipes written by Abdul Ghafar Chehab and published by . This book was released on 2008 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: Horizontal directional drilling is increasingly used to install pipes without costs and disruptions associated with conventional 'cut and cover' installations. This technique, which was developed by industrial innovators, feature complex soil and pipe response which is not well understood. The success of this operation depends on knowledge of the pulling forces applied, level of ground disturbance, ground expansion or fracture from mud pressure, and the effect of the pulling operation on the pipes. Tensile stresses in the pipe vary with time during and after installation, and along the pipe. This applies especially to polymer pipes where the stresses during insertion and those over the service life of the pipe may influence its performance. The main objective of this study is to model the short term and long term response of pipes installed using horizontal directional drilling and to investigate the effect of the time dependent behaviour of polymer pipes, as well as other installation variables on the performance of the pipe during and after installation. The mechanical behaviour of high density polyethylene used to manufacture a significant portion of pipes installed using horizontal directional drilling is investigated and two sophisticated constitutive models are developed to simulate the time-dependent behaviour of high density polyethylene. The interaction between the pipe and the surrounding soil during horizontal directional drilling installations is also investigated and modelled. A FORTRAN algorithm is developed to calculate the short and long term response of elastic and polymeric pipes installed using horizontal directional drilling. The program uses the HDPE constitutive models as well as the pipe-soil interaction model developed in the study. After evaluation, the developed program is employed in a parametric study on the sensitivity of short term and long term pipe response to different parameters, including the effect of overstressing the pipe during installation. As Multiaxial modeling is necessary for accurate analysis of some applications including the swagelining method, a uniaxial constitutive model developed in the current study is generalized to a multi-axial model that can simulate the response to biaxial stress-strain fields. The multi-axial model is implemented in a finite element code and its performance in simulating multiaxial stress-strain fields is evaluated.
Book Synopsis Axial Response of HDPE Pipes as a Result of Installation by Directional Drilling by : Ian D. Moore
Download or read book Axial Response of HDPE Pipes as a Result of Installation by Directional Drilling written by Ian D. Moore and published by . This book was released on 2011 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Axial stresses and strains develop in high density polyethylene (HDPE) pipes during installation by directional drilling. This paper examines the engineering design implications regarding these axial stresses resulting from three recent studies. First, the cyclic axial response of the leading end of a HDPE pipe is measured for the cyclic pulling force history experienced as it is pulled into place. Pulling force history measured in the field is approximated and used to measure the response of pipe samples. The study includes evaluation of simple creep modeling to estimate the axial strains, demonstrating that these provide useful, conservative estimates of maximum axial strain. Second, the development of axial tension in the leading section of the HDPE pipe after connection to appurtenances is modeled in the laboratory. It is demonstrated that the conventional 24 h time period over which the pipe is left to recover in length after installation ensures that the axial tensions that redevelop are at low levels. A calculation procedure is introduced to determine the axial force distribution along the pipe during installation and over its service life. Pulling force modeling similar to that outlined in ASTM 1962-05 is extended to consider the effects of pipe and soil deformations, so that cyclic response during installation and axial stress history after installation are determined. The study demonstrates that values of from one quarter to one third of the maximum pulling force can be used to estimate the long term axial stress in the pipe over a 50 year service life (for assessment of potential for slow crack growth). Strain measurements in the laboratory simulation of pipe installation and strain calculations for computed response over the service life of the pipe are found to be estimated effectively using time-dependent creep (secant) modulus for the HDPE.
Book Synopsis Ground Displacements and Pipe Response During Pulled-in-place Pipe Installation by : Johnathan Andrew Cholewa
Download or read book Ground Displacements and Pipe Response During Pulled-in-place Pipe Installation written by Johnathan Andrew Cholewa and published by . This book was released on 2009 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer pipes, typically high density polyethylene (HDPE), can be pulled-into-place, avoiding traditional cut-and-cover construction, using pipe bursting and horizontal directional drilling (HDD) pipe installation techniques. Of particular interest, are the ground displacements, induced by cavity expansion, associated with these techniques and the strains that develop in existing pipes in response to these displacements. Further, the axial stress-strain response of the new HDPE pipe during and after the cyclic pulling force history required to pull the pipe into place is of interest. Surface displacements and strains in an adjacent polyvinyl chloride (PVC) pipe induced by static pipe bursting were measured during the replacement of a new unreinforced concrete pipe. For the pipe bursting geometry tested, the maximum vertical surface displacement measured at the ground surface was 6 mm, while the distribution of vertical surface displacements extended no more than 2 m on either side of the centreline. The maximum longitudinal strain measured in the PVC pipe was less than 0.1% and its vertical diameter decreased by only 0.5%, suggesting that pipe bursting did not jeopardize the long-term performance of the water pipe tested. In addition, results from identical stress relaxation and creep tests performed on whole pipe samples and coupons trimmed from a pipe wall were compared, and these demonstrated that the coupons exhibited higher modulus than the pipe samples. Therefore, isolated pipe samples, as opposed to coupons, were tested to quantify the stress-strain response of HDPE pipe during the simulated installation, strain recovery, and axial restraint stages of HDD. Axial strains were found to progressively accumulate when an HDPE pipe sample was subjected to the cyclic stress history used to simulate an HDD installation. It was shown that existing linear and nonlinear viscoelastic models can serve as predictive design tools for estimating the cyclic strain history of HDPE pipe during installation. For the specific conditions examined, the tensile axial stresses redeveloped in the pipe samples, once restrained, were not large enough to lead to long-term stress conditions conducive to slow crack growth even when the short-term performance limits were exceeded by a factor of 1.5.
Book Synopsis Time Dependent Behaviour of Gravity Flow HDPE Pipe by : Fuping Hu
Download or read book Time Dependent Behaviour of Gravity Flow HDPE Pipe written by Fuping Hu and published by . This book was released on 1995 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Profiled HDPE Pipe Response to Parallel Plate Loading by : ID. Moore
Download or read book Profiled HDPE Pipe Response to Parallel Plate Loading written by ID. Moore and published by . This book was released on 1994 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: The parallel plate load test is used to measure 'pipe stiffness' for HDPE pipe. Pipe stiffness is employed as a measure of pipe resistance to bending deformation as well as a quality control index for the manufacturing process. Unfortunately, the parallel plate test induces a complex state of stress and strain in the pipe, and interpretation of the test results is not straightforward. Simple analysis for a thin circular ring or shell is generally used for these products, but in reality materials like high density polyethylene are viscoelastic (modulus is time and load path dependent) and the depth of the pipe profile may be a significant proportion of the diameter. This paper introduces a three dimensional viscoelastic finite element analysis for HDPE pipe, testing the computational method through comparisons with laboratory data. The analysis is used to examine the nature of pipe response during the parallel plate test. The local distributions of stress and strain through the profile are considered, as well as the effect of loading rate on the pipe response. Conclusions are drawn regarding the ability of conventional thin ring theory to predict circumferential stress and strain, and the implications for pipe design are briefly discussed.
Download or read book Handbook of Polyethylene Pipe written by and published by Plastics Pipe Institute. This book was released on 2012-02 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published by the Plastics Pipe Institute (PPI), the Handbook describes how polyethylene piping systems continue to provide utilities with a cost-effective solution to rehabilitate the underground infrastructure. The book will assist in designing and installing PE piping systems that can protect utilities and other end users from corrosion, earthquake damage and water loss due to leaky and corroded pipes and joints.
Book Synopsis Study of Slow Time Dependent Crack Growth in Polyethylene Pipes by : Kumar Sankaran
Download or read book Study of Slow Time Dependent Crack Growth in Polyethylene Pipes written by Kumar Sankaran and published by . This book was released on 1999 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1989 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Improved Design and Construction Practices for Thermal Loads in Plastic Gas Pipelines by : Omer Bilgin
Download or read book Improved Design and Construction Practices for Thermal Loads in Plastic Gas Pipelines written by Omer Bilgin and published by . This book was released on 1999 with total page 680 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis M55 PE Pipe - Design and Installation, Second Edition by : Awwa
Download or read book M55 PE Pipe - Design and Installation, Second Edition written by Awwa and published by . This book was released on 2020-09-25 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: This manual describes the design, specification, installation, and maintenance of polyethylene (PE) water pipe.
Book Synopsis Properties and Structure of Polymers (microform). by : Arthur Victor Tobolsky
Download or read book Properties and Structure of Polymers (microform). written by Arthur Victor Tobolsky and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Selected Water Resources Abstracts by :
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1985 with total page 690 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electrical Properties of Polymers by : A. R. Blythe
Download or read book Electrical Properties of Polymers written by A. R. Blythe and published by Cambridge University Press. This book was released on 2005-06-10 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive update on the fundamentals and recent advancements of electrical properties of polymers.
Download or read book Indian Science Abstracts written by and published by . This book was released on 1996 with total page 1206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Piping and Pipeline Calculations Manual by : Philip Ellenberger
Download or read book Piping and Pipeline Calculations Manual written by Philip Ellenberger and published by Elsevier. This book was released on 2014-01-22 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: Piping and Pipeline Calculations Manual, Second Edition provides engineers and designers with a quick reference guide to calculations, codes, and standards applicable to piping systems. The book considers in one handy reference the multitude of pipes, flanges, supports, gaskets, bolts, valves, strainers, flexibles, and expansion joints that make up these often complex systems. It uses hundreds of calculations and examples based on the author's 40 years of experiences as both an engineer and instructor. Each example demonstrates how the code and standard has been correctly and incorrectly applied. Aside from advising on the intent of codes and standards, the book provides advice on compliance. Readers will come away with a clear understanding of how piping systems fail and what the code requires the designer, manufacturer, fabricator, supplier, erector, examiner, inspector, and owner to do to prevent such failures. The book enhances participants' understanding and application of the spirit of the code or standard and form a plan for compliance. The book covers American Water Works Association standards where they are applicable. Updates to major codes and standards such as ASME B31.1 and B31.12 New methods for calculating stress intensification factor (SIF) and seismic activities Risk-based analysis based on API 579, and B31-G Covers the Pipeline Safety Act and the creation of PhMSA
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on with total page 1050 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fossil Energy Update written by and published by . This book was released on 1977 with total page 1052 pages. Available in PDF, EPUB and Kindle. Book excerpt:
