Reliability analysis of integral hot deep drawing and cold flow forming process for large-diameter seamless steel gas cylinders

  • Weiya Jin
  • Yuebing Li
  • Zengliang Gao
  • Xieping Yin
  • Xiakang Ma
ORIGINAL ARTICLE
  • 11 Downloads

Abstract

Refillable seamless steel gas cylinders are widely used to store and transport clean energy, such as compressed natural gas (CNG) and hydrogen. Conventional manufacturing processes have some disadvantages which bring potential hazard for the safety and reliability of cylinders. After reviewing the conventional manufacturing processes, a hot deep drawing process is recommended with solid steel billet stock. Based on this, an integral manufacturing process with cold flow forming process is proposed for large-diameter seamless steel gas cylinders to improve the performance of gas cylinders. Several cylinder properties including size error and fatigue lives are compared. The uniformity of wall thickness is further improved for gas cylinders by the integral process. The gas cylinders obtain fine surface finish, high tolerance of size, and commensurately enhanced fatigue lives. Meanwhile, the failure mode and effect analysis (FMEA) method is adopted to study the reliability of steel gas cylinders. The reliability of steel gas cylinder with cold flow forming process is compared with the conventional processes. The probabilities of most causes are ameliorated, except for the lamination that is usually resulted from wrong flow forming process parameters, e.g., high reduction rate and feed rate. As a whole, there is a marked drop in the risk priority number of the integral process. It is worth to further spread this in gas cylinder industry.

Keywords

Cold flow forming Hot deep drawing Steel gas cylinders Fatigue life Reliability 

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Notes

Acknowledgements

The authors are grateful to all related engineers from Zhejiang Jindun Pressure Vessel Co. Ltd. for full cooperation to proceed FMEA method for common failure modes in the manufacturing process.

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Copyright information

© Springer-Verlag London Ltd., part of Springer Nature 2018

Authors and Affiliations

  1. 1.Institute of Process Equipment and Control EngineeringZhejiang University of TechnologyHangzhouChina
  2. 2.Engineering Research Center of Process Equipment and Re-manufacturing of Ministry of EducationZhejiang University of TechnologyHangzhouChina
  3. 3.Zhejiang Jindun Pressure Vessel Co. Ltd.ShaoxingChina

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