| The pressure vessel containing pit defects brings stress concentration at the place of pit because of break of geometrical figure, it makes a certain influence on the security and used life of vessel. According to above consideration, carrying out the following research about the pressure vessel containing pit defects.Firstly, choosing pits in the different situation and different dimension, owing to existing pits, according to request of GB/T19624-2004 Safety Assessment for Pressure Vessels Containing Defects, need carry through safety assessment for the pits which satisfy G0>0.1.The results indicate that researchful pits are in the allowable range of safety assessment.Seccondly, fatigue analysis is based on the statics analysis, so, making use of finite element software MSC.Patran to carry through statics analysis for the vessels which contain different kind of pits, and making ues of Excel to carry through multianalysis, gainedingaregressive formulas. The results indicate that along with the increase of Z/δn, maximal principal stress and stress concentration factor are power increases and along with the increase of X/(?)n , maximal principal stress and stress concentration factor are power decreases.Thirdly, according to the statics analysis, making use of fatigue design curve in JB 4732 and fatigue analysis software MSC.Fatigue to carry through fatigue life analysis for the vessels which contain different kind of pits, and making ues of Excel to carry through multianalysis, gaineding aregressive formulas. The results indicate that along with theincrease of Z/δn, design fatigue life and MSC fatigue life are power decreases and along with the increase of X/(?) , design fatigue life and MSC fatigue life are power increases.
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