In some instances the designer may make the conscious decision that they do not want to follow the ASME STS-1 Table 4.4.7-1 for the minimum thickness and stiffening ring requirements.  This is common with small diameter stacks, such as Flare stacks where the requirements of this table are not always relevant to the stack.  

There are two ways that these results can be removed from the final report.  

1) Check the "STS_Mins" option to disable, and in this case the check will not appear anywhere in the output.  Go to "Design" / "Design Codes" / Click the "Stress" tab.  

2) Un-check this item in the Table Of Contents before pressing the "Generate Output" option.