Stress Analysis of Nozzle to Head Junction Without Stress Indices

Author (s):

  1. Ashish Gohil, Nirma University, Ahmedabad, Gujarat, India
  2. Maharshi J. Bhatt, SSEC, Bhavnagar, Gujarat, INDIA,


Usually the design of pressure vessel is made with external required openings and attachments. The most commonly external attachment is the nozzles with their junctions. Under different loading conditions the stress concentration will occur at the junction area. In addition, due to discontinuity of the geometry and difficulties during welding and defect detected there, the junction region will become the weakest point and the failure source of the whole structure. In Reactor, stresses are produced at nozzle to shell and nozzle to head attachment. Evaluating the state of stress at the junction of a nozzle to a bottom head is most important. In this paper as per WRC 107 stresses at the eight points of nozzle to head junction is calculated and also PVCodeCalc is employed to calculate stresses of various components at attachment of reactor as per ASME. It contains curves for hollow and solid circular attachment; it determines local stresses at the eight points (Four upper and Four lower points) in the spherical and cylinder shell. This resultant data determines whether design is safe or not for given design parameters.

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