Problem:

Why are the Stress results for ASME B31.8 0.00 in AutoPIPE output report?

Example:

Solution:

Scroll over to the right in the grids to see the Combined column:

The combined column provides the Hydrotest operating condition stresses results in addition the calculated Allowable and Ratio values. 

Same goes for the Output report,

Question: But why are the hoop stress results grid value = 0.00 and only shown for those points where the Piping Stress Equation is set to "Unrestrained"??

Answer: 

Please see the following AutoPIPE help section:

Help > Contents> Contents Tab> Reference Information> Code Compliance Calculations> ASME B31.8 - (2014)> Hoop Stress> see note at the bottom of the page, 

Copied from help:

"Note: The Hoop stress for restrained piping combinations e.g. GRTP1 can be viewed...." 

Note: On the Piping Restraint tab of the input grids one can always select which Stress Equation to use or there is an option to print both. 

See Also

ASME B31.8 Piping Code Calculation Issues

Bentley AutoPIPE