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You searched for subject:(Ductile iron pipe). Showing records 1 – 3 of 3 total matches.

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Cornell University

1. Wham, Brad. Jointed Pipeline Response To Large Ground Movements.

Degree: PhD, Civil and Environmental Engineering, 2016, Cornell University

This thesis addresses the performance of jointed pipelines subject to ground deformations triggered at a large scale by earthquakes and a construction-related scale by tunneling. Understanding and quantifying jointed pipeline response at these scales allows for better design, operational management, and risk assessment of underground infrastructure, where cast iron (CI) and ductile iron (DI) pipelines in the U.S. account for approximately 75% of water distribution systems. The thesis covers the response of DI and molecularly oriented polyvinyl chloride (PVCO) pipelines to earthquaketriggered soil movement as well as CI and DI pipeline response to tunneling. A series of specially designed four-point bending experiments and 3D finite-element (FE) simulations were performed to characterize DI push-on joints commonly used in water distribution systems to develop a relationship between the rotation and axial pullout at both metal binding and first leakage. The results of uniaxial tension and onedimensional compression tests on the elastomeric gaskets in DI push-on joints were implemented in numerical models that show joint leakage to be independent of load path, with a unique pressure boundary that predicts leakage for many combinations of axial pullout and rotation. The increased circumferential strength, reduced pipe wall thickness, and enhanced cross-sectional flexibility of PVCO pipelines was evaluated through the characterization of PVCO material properties, axial joint tension and compression tests, four-point bending tests, and a full-scale fault rupture experiment. A nominal 150-mm (6-in.)diameter PVCO pipeline is able to accommodate significant fault movement through axial tensile and bending strains in the pipe in combination with modest levels of axial slip at the restrained joints. Relatively large levels of axial strain in the low modulus PVCO material, which varies between 1% and 2% at pipeline failure, are able to sustain substantial extension and compression from ground movements. Soil/pipeline interaction modeling was performed for vertical and horizontal ground movements caused by tunneling in jointed CI and DI pipelines perpendicular to the tunnel centerline that (1) extend beyond the width of the settlement profile and (2) connect through 90° tees with a pipeline parallel to the tunnel. The modeling incorporates the results of large-scale laboratory tests. Guidance is provided for design and the identification before tunneling of potential difficulties. In particular, CI tees are at high risk when subject to tunneling induced soil movement, whereas DI pipelines and tees have sufficient capacity to accommodate high levels of tunneling related ground deformation. iv Advisors/Committee Members: O'Rourke,Thomas Denis (chair), Stewart,Harry Eaton (committee member), Ingraffea,Anthony R (committee member).

Subjects/Keywords: pipelines, pipe joints; ductile iron pipe, PVCO pipe; tunneling ground deformation

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APA (6th Edition):

Wham, B. (2016). Jointed Pipeline Response To Large Ground Movements. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/43567

Chicago Manual of Style (16th Edition):

Wham, Brad. “Jointed Pipeline Response To Large Ground Movements.” 2016. Doctoral Dissertation, Cornell University. Accessed January 24, 2021. http://hdl.handle.net/1813/43567.

MLA Handbook (7th Edition):

Wham, Brad. “Jointed Pipeline Response To Large Ground Movements.” 2016. Web. 24 Jan 2021.

Vancouver:

Wham B. Jointed Pipeline Response To Large Ground Movements. [Internet] [Doctoral dissertation]. Cornell University; 2016. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1813/43567.

Council of Science Editors:

Wham B. Jointed Pipeline Response To Large Ground Movements. [Doctoral Dissertation]. Cornell University; 2016. Available from: http://hdl.handle.net/1813/43567


Iowa State University

2. Cheng, Chu-lin. Permeation of organic compounds through ductile iron pipe gaskets.

Degree: 2009, Iowa State University

Ductile iron (DI) pipes have been used for the conveyance of drinking water in drinking water distribution systems over the past several decades. It has been estimated that almost half of all new water mains installed in North America are DI pipes. Although DI pipe itself is resistant to chemical permeation, the polymeric gaskets that join and seal the pipe segments are reported to be susceptible to permeation by organic contaminants. Pipe-drum, diffusion cell experiments, and numerical simulations were conducted in this research to obtain a faster mean to evaluate possible permeations through DI gaskets. Of the five types of gasket materials tested using the gravimetric sorption test, ethylene-propylene-diene monomer (EPDM) had the highest sorption of gasoline, while fluoroelastomer rubber (FKM) exhibited very low sorption of gasoline. The sorption test results suggested that the least to most resistance to permeation of premium gasoline for the five gasket materials were EPDM, styrene-butadiene rubber (SBR), chloroprene rubber (CR; neoprene), acrylonitrile butadiene rubber (NBR), and FKM. A typical gasket was found to be made of two portions, the heel and the bulb, of the same polymer but different formulation. Gravimetric sorption tests suggested that the heel portion of all gaskets may be more resistant to permeation than the bulb making it the limiting step for permeation of organic compounds in gasoline. Pipe-drum experiments showed that SBR gasket had the highest permeation rates of benzene, toluene, ethylbenzene, and xylenes (BTEX), followed by CR, EPDM, and NBR. With regards to threats to drinking water under water stagnation conditions in the pipe, the 5 μg/L maximum contaminant level (MCL) for benzene will likely be exceeded during an 8-hour stagnation period for SBR gaskets in contact with free-product premium gasoline. NBR gaskets were found to be sufficiently resistant to permeation by benzene or other BTEX compounds in gasoline and the benzene concentration is unlikely to exceed EPA MCLs. Assessment based on data from the pipe-drum experiments suggested that when there is flow of water in the pipe, benzene and other BTEX compounds in gasoline will not exceed EPA MCLs. A diffusion cell device was developed to obtain diffusion coefficients of BTEX compounds for various gasket materials under controlled conditions. Using curve fitting of the permeation data by numerical modeling, the diffusion coefficients of BTEX compounds through SBR and NBR gasket materials was found to range from 10-7 to 10-8 cm2/s. The steady-state permeation rates were found to correlate in a linear relationship with thickness while the diffusion coefficients were found to be invariable to the thickness of the polymer tested (2 mm to 5 mm). The diffusion cell provided a rapid, inexpensive, and relatively well-controlled means to study permeation of polymeric gasket materials for DI pipes and the data obtained were used to model benzene permeation of the pipe-drum experiments. The permeation of benzene through a 4-inch SBR gasket of…

Subjects/Keywords: Diffusion cell; Ductile iron pipe; Gaskets; Numerical simulation; Organic compounds; Permeation; Civil and Environmental Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Cheng, C. (2009). Permeation of organic compounds through ductile iron pipe gaskets. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/10744

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Cheng, Chu-lin. “Permeation of organic compounds through ductile iron pipe gaskets.” 2009. Thesis, Iowa State University. Accessed January 24, 2021. https://lib.dr.iastate.edu/etd/10744.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Cheng, Chu-lin. “Permeation of organic compounds through ductile iron pipe gaskets.” 2009. Web. 24 Jan 2021.

Vancouver:

Cheng C. Permeation of organic compounds through ductile iron pipe gaskets. [Internet] [Thesis]. Iowa State University; 2009. [cited 2021 Jan 24]. Available from: https://lib.dr.iastate.edu/etd/10744.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Cheng C. Permeation of organic compounds through ductile iron pipe gaskets. [Thesis]. Iowa State University; 2009. Available from: https://lib.dr.iastate.edu/etd/10744

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

3. Pariya-Ekkasut, Chalermpat. Experimental Evaluation of Ductile Iron Pipeline Response to Earthquake-Induced Ground Deformation.

Degree: PhD, Civil and Environmental Engineering, 2018, Cornell University

This thesis addresses the performance of ductile iron (DI) pipelines with restrained axial slip joints subject to earthquake-induced ground deformation. DI pipelines account for 23% of U.S. water distribution systems (US.EPA, 2013), and have been used extensively for replacing aging cast iron (CI) pipelines. Under earthquake-induced ground deformation a jointed DI pipeline is vulnerable primarily to joint pullout and excessive joint rotation. Improvements in pipeline technology have led to the development of DI pipelines with restrained axial slip joints that move axially and rotate to conform to differential soil movements, but are restrained from pullout without leakage and loss of structural integrity. A series of large-scale experiments was performed on DI pipelines with restrained axial slip joints to characterize tensile strength properties, direct axial compression and tension, moment vs rotation characteristics, soil axial restraint, and performance in response to fault rupture. Large-scale tests were performed primarily on 6-in. (150-mm)-diameter DI pipelines, but also included direct tension and bending tests on 12-in. (300-mm)-diameter DI pipelines. The direct compression tests show either leakage or irrecoverable deformation in the form of large rotation at loads equal to or slightly higher than load consistent with the proportional limit stress of DI pipe. The direct tension tests show that tensile failure of the pipeline depends on the locking mechanism of the joint. Joints that use full circumferential locking rings generate the highest resisting force. Failure and leakage under tension with these features occurred as DI ring shear fracture and bell fracture. In contrast, joints that use locking segments mobilized lower pullout force. Failure and leakage of joints with locking segments occurred as local deformation at the spigot caused by load concentration at the locking segments, allowing the weld bead to slip past the locking segments and cause leakage. Large-scale fault rupture tests provide a comprehensive and detailed understanding of the sequence of joint movements, combined axial pullout and rotation at each joint, and the actual axial forces influenced by longitudinal frictional resistance and axial resistance to movement at the joints. The longitudinal frictional forces are controlled by at-rest (Ko) conditions, which set the initial state of stress along the pipeline near the north and south ends of the split basin, and the conditions of maximum lateral soil reaction during fault rupture, which establish the maximum longitudinal frictional resistance for the pipeline in the vicinity of fault rupture. The joint axial resistance model proposed in this work is obtained from the expression for face resistance of the leading edge of a jacked pipe proposed by Meskele and Stuedlein (2015) from the work of Weber and Hurtz (1981). The model is used to predict the axial resistance from a restrained axial slip joint for DI pipe and the pullout restraints of PVCO and PVC pipelines. The… Advisors/Committee Members: O'Rourke, Thomas Denis (chair), Stewart, Harry Eaton (committee member), Grigoriu, Mircea Dan (committee member).

Subjects/Keywords: Civil engineering; Ductile iron pipe; Fault rupture; Ground deformation; Jointed pipelines; Large-scale experiments; Water distribution systems

…5 1.3.2 Kubota Earthquake Resistant Ductile Iron Pipe (ERDIP)… …Joint (courtesy Kubota Corp.) 1.3.2 Kubota Earthquake Resistant Ductile Iron Pipe… …TR-XTREME™ US Pipe manufactures pipe with a ductile iron joint, under the commercial name… …American Cast Iron Pipe Company, Kubota Corporation, McWane Corporate, and U.S. Pipe. vi TABLE… …accommodate permanent ground deformation by either ductile flexure or axial deformation of the pipe… 

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Pariya-Ekkasut, C. (2018). Experimental Evaluation of Ductile Iron Pipeline Response to Earthquake-Induced Ground Deformation. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/59351

Chicago Manual of Style (16th Edition):

Pariya-Ekkasut, Chalermpat. “Experimental Evaluation of Ductile Iron Pipeline Response to Earthquake-Induced Ground Deformation.” 2018. Doctoral Dissertation, Cornell University. Accessed January 24, 2021. http://hdl.handle.net/1813/59351.

MLA Handbook (7th Edition):

Pariya-Ekkasut, Chalermpat. “Experimental Evaluation of Ductile Iron Pipeline Response to Earthquake-Induced Ground Deformation.” 2018. Web. 24 Jan 2021.

Vancouver:

Pariya-Ekkasut C. Experimental Evaluation of Ductile Iron Pipeline Response to Earthquake-Induced Ground Deformation. [Internet] [Doctoral dissertation]. Cornell University; 2018. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1813/59351.

Council of Science Editors:

Pariya-Ekkasut C. Experimental Evaluation of Ductile Iron Pipeline Response to Earthquake-Induced Ground Deformation. [Doctoral Dissertation]. Cornell University; 2018. Available from: http://hdl.handle.net/1813/59351

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