I am using Aluminum piping throughout my model. To accomplish this, i am using Material: (14) ALUMINUM as 6061-T6 was not an option. However, when I run my error check I am receiving numerous errors of 121E and 253E

121E: Hot allowable 1 on element 10 to 20 is not specified, while the corresponding temperature is. Shx is needed for allowable calculations.

253E: On element 10 to 20 cold allowable is not specified. It is set to 0.0.


What is causing this? How do I resolve these errors?


Any help is appreciated.

Thank you,
-Drew