Here's a guide on how to activate the Kellogg PEQ (Pressure equivalency check) or the newer NC-3658-3 method to check for the possibility of flange leakage.


  1. On a rigid flange element, double click on the flange check option. 
  2. Data that CAESAR II needs from the user, is where you wish the flange leak check to be active, and the grade of the material for the flange, in order to determine the correct temperature and pressure rating. 
  3. Open your static load case editor. For any possible operating load case where you want to check for the possibility of a flange leak, you need to select the temperature that the flange leak check will perform the analysis with:
  4. At your report output, highlight the load cases you want to review results on, pick either the PEQ report or NC3658, then click View Reports. Depending on the axial force and bending moment acting at the node where the leak check is active, the pressure equivalency rating will be passing or failing its associated allowable.