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Cheng Q.,Tianjin University | Wang W.,AEROSUN TOLA Expansion Joint Co. | Niu Y.,AEROSUN TOLA Expansion Joint Co. | Liu Y.,AEROSUN TOLA Expansion Joint Co. | Qi R.,Aerosun Corporation
Natural Gas Industry | Year: 2015

Pipelines are indispensable to the storage and transportation of oil and gas. Displacements of pipelines induced by thermal expansion and contraction due to the changes in external temperatures may pose potential threats to the safety and reliability of pipeline transportation. Under such circumstances, aluminum alloy expansion joints are used extensively as the compensator for thermal displacement during pipeline transportation. To deploy aluminum alloy expansion joints under specific conditions in accordance with the requirements specified by American Society of Mechanical Engineers (ASME), this paper took the pipeline project of an international company as an example to highlight solutions and techniques in case of deviations from ASME codes when aluminum alloy expansion joints are used. Application conditions for "U-shaped bellows with radius smaller than 3 times of wall thickness of the bellows (t)" are clarified. In addition, Friction Stir Weld (FSW) was proposed for aluminum alloy expansion joints with relevant adaptability tests performed. Eventually, two code cases of ASME, i.e. Code Case 2587 and Code Case 2593-1, were formed. This study may provide necessary theoretical foundations and implementation techniques for the design, development and fabrication of relevant products under similar conditions. ©, 2015, Natural Gas Industry Journal Agency. All right reserved.

Liu C.,CAS Hefei Institutes of Physical Science | Lu K.,CAS Hefei Institutes of Physical Science | Sheng L.,AEROSUN TOLA Expansion Joint Co. | Song Y.,CAS Hefei Institutes of Physical Science | And 3 more authors.
Fusion Engineering and Design | Year: 2016

This paper presents the key manufacturing and testing processes of the prototype ITER feeder seismic bellows. The design of the double bellows was iterated with the results of analysis based on the Expansion Joint Manufacturers Association (EJMA) standard. Each inner and outer bellows was supported in dedicated molds and formed by a hydraulic pressure machine rated at 800tons. The double bellows were constructed by welding individual collars to the end flanges. The seismic bellows was tested with cyclic pressurization of the interlayer space to 2bars absolute pressure for 5 cycles. This was followed by 200 cycles of tensile fatigue test with 90mm of stretching from the nominal design length. After the mechanical fatigue test, a full tensile test with 315mm of stretching from its nominal length was conducted. Helium leak tests, with the sensitivity of the helium leak detector set to 1×10-9 Pam3/s of helium, were performed at different stages of pressure and mechanical tests. The prototype bellows was qualified for its leak tightness at all time during the qualification test. © 2016 Elsevier B.V.

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