Hi All,

Is it possible to use a material at temperature higher than shown in Appendix A of B31.1 and B31.3? If then possible, how could I know the hot alowable stress to use in Caesar model? Thanks and hope to learn a lot from this forum.

Ed-Lamigo

Hi, Ed-Lamigo,

The short answer is "no". It would be useful for you to read the notes that are included in the Appendices as they explain the limits. In any event, if the design Code is a B31 Code you have to "play by the rules" if you are to assure Code compliance.

One thing I think you will want to do for sure is to give B31.3, Appendix V, (Allowable Variations in Elevated Temperature Service) a good reading. Keep in mind that the appendix is addessing VARIATIONS - NOT an operating case.

I am sue there will be more comment from my compeers and after some thought even I (who usually supplies short, concise and to the point opinions) will likely write more.

Regards, John.

Thank you John. So I read the Appendix of B31.1 and you are right there are notes to materials that specified limits to temperature. I did not pay much attention on these notes specially that as a beginner I think only and depend on material database in Caesar and one day I saw some model using temperature higher than for specified in B31.1. Thank you very much.

Ed-Lamigo