Hello.

Is there a rule of thumb for choosing a design temperature when only an operating temperature is provided for analysis? On my current project, both design and operating pressure have been chosen, but only the operating temperature.

I remember hearing some years back that about simply adding 50F, but most of my systems are below 200F and this seems too conservative.

For now, I have used 1.2xOperatingTemperature for my design case. Any suggestions?

Regards,
Dmitriy

Hi Dmitriy,

I guess 20% more is enough, if operating temperature is not close to creep temperature. If so, you need to careful that even the small temp variation can make lots of differences.
Assume there are no process or other team to provide you the design temp.
You may compare to specification of simillar project same system as reference?

All of the temp's are below 250F for alloy & carbon steel. Creep is not a concern. Thank you for your response.