Total views : 152

Finite Element Analysis of Skirt to Shell Junction in a Pressure Vessel


  • Symbiosis Institute of Technology, Lavale, Pune – 412115, Maharashtra, India
  • Larsen and Toubro, Ranoli, Vadodara –391350, Gujarat, India


Objectives: The objective of this research work is to find the effect of providing hotbox at skirt to shell junction of a pressure vessel on the stresses induced at this junction. Methods/Statistical Analysis: In present work, since the vessel is to be supported at some elevation from ground, a conical skirt support is used. Two models of skirt to shell junction are made, in Unigraphics 10, one without hotbox while other with hotbox. A thermo-structural analysis of models is performed using ANSYS Workbench15. Stress linearization is done and stresses are limited to code allowable to ensure protection against plastic collapse and local failure. Findings: The result of finite element analysis for the case of model without hotbox shows that thermal stresses as high as 329 MPa are induced at the y-ring, which is much higher than the allowable stress at that temperature. When a hotbox is provided at this region, the stress is found to be reduced to 35.082 MPa, which is less than the allowable stress. So, the vessel will work safely if a hotbox of minimum 480 mm length is provided at the critical junction of skirt and shell. Stress is linearized at five stress classification lines. The linearized stresses and their combinations for four load cases are compared with the code allowable limit, and are found to be less than allowable stress. This ensures the protection of vessel against plastic collapse and local failure. Application/Improvements: Such analysis is needed to be performed for long vessels supported on skirt type of support, as the total vessel loads will be transferred to skirt from this junction only.


Finite Element Analysis, Hotbox Analysis, Pressure Vessel, Skirt to Shell Junction, Stress Linearization

Full Text:

 |  (PDF views: 114)


  • Kolekar D, Jewargi SS. Stress analysis of pressure vessel with different type of end connections by fea. International Journal of Innovative Research in Science, Engineering and Technology. 2015; 4(5):2769–75. Crossref
  • Chandra NP, Belkar SB. Analytical study of coke drum skirt support hot box. International Journal of Emerging Science and Engineering. 2014; 2(9):7–11.
  • Alexander C, Boswell R. Techniques For Modeling Thermal and Mechanical Stresses Generated in Catalytic Cracker and Coke Drum Hot- Boxes, Proceedings of ASME Pressure Vessels and Piping Conference, Denver, Colorado, USA: 2005. p. 527–37. Crossref
  • Sagar P, Sachin TS, Barve. Finite element analysis of skirt to dished junction in a pressure vessel. International Journal of Modern Engineering Research. 2013; 3(4):1–4.
  • Attar PR, Agiwale MC. Analysis of dished head and skirt joint of pressure vessel using fea method. International Journal of Recent Technology and Engineering (IJRTE).2015; 23(1):49–52.
  • Makwana MM, Parmar G, Badi M. Thermal analysis of different attachment of skirt to dished end joint of stainless steel vessel. International Journal for Scientific Research Development. 2016; 4(3):826–8.
  • Pan J, Chen X, Jun C. Comparison of different analysis design methods in the calculation of hydrogenation reactor skirt structure, Proceedings of ASME 2014 pressure vessels and piping conference, Anaheim, California, USA: 2014. p.1–5. Crossref
  • ASME Boiler and Pressure Vessel Committee on Pressure Vessels. 8 Division 2, Alternative Rules, Rules for Construction of Pressure Vessels. Addison-Wesley; 2010.
  • ASME Boiler and Pressure Vessel Committee on Pressure Vessels. Linearization of Stress Results for Stress Classification. In 8 Division 2, Alternative Rules, Rules for Construction of Pressure Vessels. AddisonWesley; 2010.
  • ASME Boiler and Pressure Vessel Committee on Pressure Vessels II Part D, Properties (Metric) Materials. AddisonWesley; 2010.


  • There are currently no refbacks.

Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.