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Thermal‐oxidative aging performance and life prediction of polyethylene pipe under cyclic and constant internal pressure

Published on Jul 20, 2019in Journal of Applied Polymer Science2.188
· DOI :10.1002/app.47766
Guohua Chen1
Estimated H-index: 1
(SCUT: South China University of Technology),
Yi Yang (SCUT: South China University of Technology)+ 2 AuthorsDapeng Yan (SCUT: South China University of Technology)
Abstract
  • References (19)
  • Citations (0)
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References19
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#1Huan Li (SUT: Shaanxi University of Technology)H-Index: 1
#2Jianying Li (Xi'an Jiaotong University)H-Index: 14
Last. Benhong Ouyang (Xi'an Jiaotong University)H-Index: 1
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In order to investigate the role of thermo-oxidative aging on the crystal structure of crosslinked polyethylene (XLPE) at temperatures below and above the melting point, thermo-oxidative aging was conducted on XLPE cable insulation at 100, 120, 140 and 160 °C respectively. The crystal structure of the fresh sample and aged samples was characterized by X-ray diffraction, differential scanning calorimetry (DSC) and scanning electron microscopy tests. The concentration of antioxidants in XLPE sampl...
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#1Yang Wang (Beijing Jiaotong University)H-Index: 1
#2Hui-qing Lan (Beijing Jiaotong University)H-Index: 1
Last. Nan LinH-Index: 1
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2 CitationsSource
#1M. Mahl (TUM: Technische Universität München)H-Index: 1
#2C. Jelich (TUM: Technische Universität München)H-Index: 1
Last. H. Baier (TUM: Technische Universität München)H-Index: 1
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For the design of a polymer liner in a high-pressure vessel, experimental and numerical analyses of highdensity polyethylene (HDPE) are conducted under tensile and compressive loads. The effect of temperature on the mechanical behavior of the HDPE is investigated experimentally in a range of 223K to 373K. For tensile and compression tests, specimens are cut out of a prototype polymer liner, which is to be developed for automobile high-pressure hydrogen tanks. The specimens include manufacturing ...
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#1Raquel MariaH-Index: 3
#2Karsten Rode (Fraunhofer Society)H-Index: 19
Last. Emmanuelle BrendléH-Index: 2
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Abstract Although the lifetime of plastic pipes is commonly determined by hydrostatic pressure tests which measure the mechanical resistance, thermo-oxidative degradation plays an important role in practice. It is, therefore, an important question to monitor the elemental processes occurring during ageing of polymers, namely the loss of stabilising additives and the degradation of the polymer. The diffusion of the phenolic antioxidant AO-18, the processing stabiliser, and changes in polymer morp...
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#1Klemens Grabmayer (Johannes Kepler University of Linz)H-Index: 7
#2Gernot M. Wallner (Johannes Kepler University of Linz)H-Index: 19
Last. Reinhold W. Lang (Johannes Kepler University of Linz)H-Index: 20
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Two commercial polyethylene grades were exposed to water at elevated temperatures and enhanced oxygen pressure. To characterize their aging behavior laser-induced photoluminescence spectroscopy was applied. Additionally, aging characterization was performed by established methods such as tensile testing, infrared (IR) spectroscopy, high performance liquid chromatography (HPLC), differential scanning calorimetry (DSC) and UV–VIS spectroscopy. During the initial stages of aging, the overall concen...
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#1Zaiton Abdul Majid (UTM: Universiti Teknologi Malaysia)H-Index: 17
#2Rahmat Mohsin (UTM: Universiti Teknologi Malaysia)H-Index: 11
This paper discuss the failure analysis of API 5L X42 (NPS8) coal-tar coated natural gas feeder line. Three separate pin holes with difference sizes were observe on the pipe surface facing leaked water pipe dismisses the possibility of corrosion as the cause of the failure. Site investigation, soil sampling and physical inspection performed to identify the cause of the pipe failures. The investigations revealed that the NPS8 gas pipe failures was caused by the failure of weld joint of underneath...
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#1Xiaomei Shi (ZJU: Zhejiang University)H-Index: 4
#2Jingdai Wang (ZJU: Zhejiang University)H-Index: 21
Last. Yongrong Yang (ZJU: Zhejiang University)H-Index: 22
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The thermo-oxidative degradation behavior of high-density polyethylene (HDPE) was investigated during oven aging at 100°C. 1H low-field solid-state nuclear magnetic resonance (NMR) was used to characterize the behaviors of molecular chains and the changes in phase content of HDPE during aging. NMR free induction decays (FIDs) were fitted by three components corresponding to the crystalline phase, interphase, and amorphous phase, respectively. The prolongation of aging led to a progressive increa...
23 CitationsSource
#1Tsung Chia Chen (NCUT: National Chin-Yi University of Technology)H-Index: 1
#2Jiun Ming Ye (NCUT: National Chin-Yi University of Technology)H-Index: 1
The squaring process to shape a circular tube into a symmetric square clad tube is examined by a three-dimensional incremental elastic-plastic finite-element method based on an updated Lagrangian formulation. The effects of various parameters, such as geometric ratio R/t, strain hardening exponent n, friction coefficient μ, and the length of tube L, on the occurrence of collapse in the squaring process are discussed and interpreted in a theoretical manner. The findings show that geometric ratio ...
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#1Y. Grace Hsuan (Drexel University)H-Index: 2
#2Wai-Kuen Wong (Drexel University)H-Index: 1
A methodology is presented to evaluate the oxidative degradation of compression-molded samples made from high-density polyethylene corrugated pipe resin. The test samples contained 2.5 wt% of carbon black and an antioxidant (AO) package that consisted of 0.05% Irganox 1010 and 0.1% Irgafox 168. Samples were incubated in forced-air ovens at temperatures of 65°C, 75°C, and 85°C (149°F, 167°F, and 185°F) and in a water bath at 85°C (185°F). The amount of AOs in the incubated samples was measured by...
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#1Zaiton Abdul Majid (UTM: Universiti Teknologi Malaysia)H-Index: 17
#2Rahmat Mohsin (UTM: Universiti Teknologi Malaysia)H-Index: 11
Last. Zulkafli Hassan (Universiti Malaysia Pahang)H-Index: 5
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Abstract Incident involving failures of 6 months old API 5L X42 (NPS8) and SDR 17, 125 mm medium density polyethylene pipe (MDPE) supplying natural gas to an industrial customer has caused serious 7 h supply disruption. Study was performed to identify the most probable cause of the pipes failures. The study conducted by reviewing the existing design and construction data, visual physical inspection, pipe material analysis, structural analysis using NASTRAN and Computational Fluid Dynamics analys...
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