I am new to Caeser II. I performed flange leakage anlysis using Caesar II and Manual Calculations and the checks failed in both. (20" flange, Class 600, WT 6.8mm, ASTM A420 WL6 materials, 9930 kPa design Pressure and -45/49 C min/max design temperature). I am not certain what this means and how best to modify the parameters. Increasing the flange rating did not help. I also did not utilize the pressure equivalent method.