Hello,

I am using code 31.8 to run piping analysis.
I have combined load cases similar to 31.3 ,when I run Stress summary report ,For expansion case I am getting massage as "LOAD CASE CHECK NOT PERFORMED".
My piping is above ground.

Can somebody explain the reason and solution for same ? CII file is also attached.

Regards,
ASK

For piping that is not fully restrained, B31.8 will use a B31.3-style evaluation of the expansion stress range. In B31.8, the terms Sc & Sh (those B31.3 terms in setting SA) are based on Su - the ultimate tensile strength; one-third of Su. You do not have Su defined. (There is no Su in our database for A105.)
Enter a value for Su and you will see an allowable expansion stress range for your B31.8 EXP check.

Thanks Dave for Prompt reply!



Regards,
ASK