The Experts below are selected from a list of 252 Experts worldwide ranked by ideXlab platform
Michael A Stubblefield - One of the best experts on this subject based on the ideXlab platform.
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light intensity effect on uv cured frp coupled composite pipe joints
Composite Structures, 2004Co-Authors: Jerry Peck, Su-seng Pang, Guoqiang Li, Michael A StubblefieldAbstract:Abstract In this study, 36 composite pipes were joined with an eight-layer chopped mat and woven fabric that was adhered with UV curing vinylester resin. The joined composite pipes were cured vertically with UV lamps at three different light intensities: 80, 35, and 15 m W/cm 2 . The mechanical properties of the cured pipes were evaluated by conducting internal Pressure testing and simply supported 4-point bending testing. The effect of UV light intensity on the internal Pressure Rating, the ultimate bending load, and stiffness was evaluated based on the test results. A finite element analysis, which considered the under-curing along the axial direction and radial direction, was conducted to validate the test results. There was a direct correlation observed between increased light intensity and increased residual mechanical properties such as internal Pressure Rating, stiffness and peak failure load. The mechanisms for variation in the system properties were found to be under-curing and non-uniform curing in the FRP joint resulting in a loss of ability to effectively transfer load from the pipe to the joint. Additional observed phenomenon was gravity leaching due to vertical curing. All mechanisms were simulated by the introduction of a sliding modulus technique in the conducted finite element analysis. FEA results agreed well with the observed failure modes.
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Fast joining of composite pipes using UV curing FRP composites
Polymer Composites, 2004Co-Authors: Su-seng Pang, H. Dwayne Jerro, Jerry Alan Peck, Michael A StubblefieldAbstract:In this paper, twelve butt-weld composite pipe joints were prepared. Among them, six were prepared using ultraviolet (UV) curing fiber reinforced plastics (FRPs) and six were prepared using ambient environment curing FRPs as controls. Filament wound composite pipes were used. Each section of pipe was 304.8 mm long with a 101.6 mm inner diameter. The wet lay-up technique was used to prepare the test samples. The curing time for the UV curing samples was 40 minutes, while the curing time was 24 hours for the control samples. Both internal Pressure tests and four-point bending tests were conducted on the prepared samples. The test results show that the UV curing FRP wrapped composite pipe joints achieved nearly the same bending strength as the control samples. However, the internal Pressure Rating achieved by the UV curing FRP coupled joints was lower than that achieved by the control samples. A finite element analysis was conducted to understand the mechanism for the lowered internal Pressure Rating. Based on the test and the finite element analysis results, the UV curing FRP can be used in joining composite truss structures and composite frame structures. Suggestions were made to increase the internal Pressure Rating of UV curing FRP coupled composite pipes. Polym. Compos. 25:298–306, 2004. © 2004 Society of Plastics Engineers.
Su-seng Pang - One of the best experts on this subject based on the ideXlab platform.
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UV-cured FRP joint thickness effect on coupled composite pipes
Composite Structures, 2007Co-Authors: Jerry Alan Peck, Su-seng Pang, Randy A. Jones, Brett H. SmithAbstract:Abstract In this study, 36 FRP composite pipes were joined with various layers of fiber-reinforced UV curing vinylester. Twelve of the composite pipes were joined with an eight-layer weld, 12 with five layers and 12 with three layers; each configuration used exactly one layer of E-glass woven fabric with the remaining layers being comprised of chopped strand mat of various widths. The joined pipes were cured with UV lamps at 80 milli-Watts per square centimeter. The mechanical properties of the cured pipe joints were evaluated by conducting internal Pressure testing and simply supported four-point bending testing. The effect of joint thickness on the internal Pressure Rating, ultimate bending load, and stiffness was evaluated to determine the role of joint thickness in under-curing of UV curing vinylesters. There was a direct correlation observed between joint thickness and internal Pressure Rating. The five-layer and three-layer joints each performed better than the eight-layer joint in bursting. The mechanism for variation in the residual properties was found to be the degree of cure and was validated by finite element analysis that utilized a composite model that simulates variable cure.
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light intensity effect on uv cured frp coupled composite pipe joints
Composite Structures, 2004Co-Authors: Jerry Peck, Su-seng Pang, Guoqiang Li, Michael A StubblefieldAbstract:Abstract In this study, 36 composite pipes were joined with an eight-layer chopped mat and woven fabric that was adhered with UV curing vinylester resin. The joined composite pipes were cured vertically with UV lamps at three different light intensities: 80, 35, and 15 m W/cm 2 . The mechanical properties of the cured pipes were evaluated by conducting internal Pressure testing and simply supported 4-point bending testing. The effect of UV light intensity on the internal Pressure Rating, the ultimate bending load, and stiffness was evaluated based on the test results. A finite element analysis, which considered the under-curing along the axial direction and radial direction, was conducted to validate the test results. There was a direct correlation observed between increased light intensity and increased residual mechanical properties such as internal Pressure Rating, stiffness and peak failure load. The mechanisms for variation in the system properties were found to be under-curing and non-uniform curing in the FRP joint resulting in a loss of ability to effectively transfer load from the pipe to the joint. Additional observed phenomenon was gravity leaching due to vertical curing. All mechanisms were simulated by the introduction of a sliding modulus technique in the conducted finite element analysis. FEA results agreed well with the observed failure modes.
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Fast joining of composite pipes using UV curing FRP composites
Polymer Composites, 2004Co-Authors: Su-seng Pang, H. Dwayne Jerro, Jerry Alan Peck, Michael A StubblefieldAbstract:In this paper, twelve butt-weld composite pipe joints were prepared. Among them, six were prepared using ultraviolet (UV) curing fiber reinforced plastics (FRPs) and six were prepared using ambient environment curing FRPs as controls. Filament wound composite pipes were used. Each section of pipe was 304.8 mm long with a 101.6 mm inner diameter. The wet lay-up technique was used to prepare the test samples. The curing time for the UV curing samples was 40 minutes, while the curing time was 24 hours for the control samples. Both internal Pressure tests and four-point bending tests were conducted on the prepared samples. The test results show that the UV curing FRP wrapped composite pipe joints achieved nearly the same bending strength as the control samples. However, the internal Pressure Rating achieved by the UV curing FRP coupled joints was lower than that achieved by the control samples. A finite element analysis was conducted to understand the mechanism for the lowered internal Pressure Rating. Based on the test and the finite element analysis results, the UV curing FRP can be used in joining composite truss structures and composite frame structures. Suggestions were made to increase the internal Pressure Rating of UV curing FRP coupled composite pipes. Polym. Compos. 25:298–306, 2004. © 2004 Society of Plastics Engineers.
L.j. Julyk - One of the best experts on this subject based on the ideXlab platform.
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Waste Feed Delivery Transfer System Analysis [SEC 1 & 2]
2001Co-Authors: L.j. JulykAbstract:This document provides a documented basis for the required design Pressure Rating and pump Pressure capacity of the Hanford Site waste-transfer system in support of the waste feed delivery to the immobilization plant for processing. The scope of the analysis includes the 200 East Area double-shell tank waste transfer pipeline system and the associated transfer system pumps for all Phase 1B and Phase 2 waste transfers from AN, AP, AW, AY, and AZ Tank Farms.
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Waste Feed Delivery Transfer System Analysis
2000Co-Authors: L.j. JulykAbstract:This document provides a documented basis for the required design Pressure Rating and pump Pressure capacity of the Hanford Site waste-transfer system in support of the waste feed delivery to the privatization contractor for vitrification. The scope of the analysis includes the 200 East Area double-shell tank waste transfer pipeline system and the associated transfer system pumps for a11 Phase 1B and Phase 2 waste transfers from AN, AP, AW, AY, and A2 Tank Farms.
H.l. Patterson - One of the best experts on this subject based on the ideXlab platform.
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Measurement of Break Away Yield Stress of Waxy Crude Oil and Pipeline Restart System Design
Offshore Technology Conference, 2013Co-Authors: T.m. Williams, J.j.c. Hsu, H.l. PattersonAbstract:Break Away Yield Stress (BAYS) has been measured on waxy crude oil from the South China Sea to help develop appropriate design specifications for the HZ production system. Design of subsea production systems for handling relatively high BAYS crude oils will be discussed. A BAYS measurement system for measuring the live and dead oils at various cooling rates and the effect of cooling rate on BAYS will also be discussed. The measured BAYS of the HZ crude at seabed temperature indicated that if production was interrupted and the crude in the pipeline cooled to seabed temperature, the restart Pressure would exceed the Pressure Rating of the originally planned pipeline. For waxy crude with high yield stress at seawater temperature, the production system must be designed to allow the production to be restarted after unplanned shutdowns. BAYS of the oil can affect the economics of a crude production system. Accurate knowledge of the BAYS will allow optimum spacing of emergency clean out parts or other system modifications that may be considered for an optimum restart system design.
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System developed to predict waxy crude`s breakaway yield stress
Oil & Gas Journal, 1996Co-Authors: T.m. Williams, J.j.c. Hsu, H.l. PattersonAbstract:Breakaway yield stress (BAYS) was measured on waxy crude oil from the South China Sea to help develop appropriate design specifications for the HZ field subsea production system there. The measured BAYS at seabed temperature indicated that if production were interrupted and the crude in the pipeline cooled to seabed temperature, restart Pressure would exceed the Pressure Rating of the originally planned pipeline. Texaco Inc. has designed a system to measure the BAYS of stock tank and live crude oils at selected temperatures. The cooling rate of the oil can be controlled and measurement of BAYS at the selected temperatures delayed to best model field conditions. The paper describes the measurement apparatus, Pressure equation, results of the measurement of HZ 32 oils, rate of cooling, special field design, and implications.
Jerry Peck - One of the best experts on this subject based on the ideXlab platform.
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light intensity effect on uv cured frp coupled composite pipe joints
Composite Structures, 2004Co-Authors: Jerry Peck, Su-seng Pang, Guoqiang Li, Michael A StubblefieldAbstract:Abstract In this study, 36 composite pipes were joined with an eight-layer chopped mat and woven fabric that was adhered with UV curing vinylester resin. The joined composite pipes were cured vertically with UV lamps at three different light intensities: 80, 35, and 15 m W/cm 2 . The mechanical properties of the cured pipes were evaluated by conducting internal Pressure testing and simply supported 4-point bending testing. The effect of UV light intensity on the internal Pressure Rating, the ultimate bending load, and stiffness was evaluated based on the test results. A finite element analysis, which considered the under-curing along the axial direction and radial direction, was conducted to validate the test results. There was a direct correlation observed between increased light intensity and increased residual mechanical properties such as internal Pressure Rating, stiffness and peak failure load. The mechanisms for variation in the system properties were found to be under-curing and non-uniform curing in the FRP joint resulting in a loss of ability to effectively transfer load from the pipe to the joint. Additional observed phenomenon was gravity leaching due to vertical curing. All mechanisms were simulated by the introduction of a sliding modulus technique in the conducted finite element analysis. FEA results agreed well with the observed failure modes.