Defect assessment without data

Reactor vessel nozzles


  • A catalytic reformer reactor vessel with a history of cracking at the nozzle welds, but little detailed operating data relevant to the critical location


  • To determine the remaining life of the nozzle welds after grinding to NDE clear status


  • Determination of historic crack growth rates from inspection data
  • Calibration of a creep crack growth model to the historic data
  • Application of the model to future operation, at the current reduced wall thickness


  • A safe prediction of remaining life, allied to an inspection plan by which the life prediction could be validated

Plant Integrity