notsocommonsense
Petroleum
- Jul 2, 2008
- 10
Folks,
AME B31.3 has a table (301.3.2) that says you can use 90% of the process temp as your mean metal temperature conservatively for uninsulated flanges if your process temp exceeds 65 C (150 F). Is there a similar shortcut method for ASME Section VIII vessel nozzle flanges?
Other question. As I know it, max coincident temp/pressure refers to the condition which yields the value closest to the allowable stress curve dictated by the P/T curve outlined by the pressure temperature chart for a given material/flange rating. So if I have operating conditions that exceed the max coincident temperature but at lower pressures, is that allowable by code - to me it seems it should be. Just looking for a confirmation. I'm a process engineer trying to figure out what to do with a vessel that has exceeded design temps on numerous occasions but never to the point of having the max allowable pressure exceeded for that temperature coincidentally.
Thank you
Yearn fer it, Learn it, confirm it, earn from it!
AME B31.3 has a table (301.3.2) that says you can use 90% of the process temp as your mean metal temperature conservatively for uninsulated flanges if your process temp exceeds 65 C (150 F). Is there a similar shortcut method for ASME Section VIII vessel nozzle flanges?
Other question. As I know it, max coincident temp/pressure refers to the condition which yields the value closest to the allowable stress curve dictated by the P/T curve outlined by the pressure temperature chart for a given material/flange rating. So if I have operating conditions that exceed the max coincident temperature but at lower pressures, is that allowable by code - to me it seems it should be. Just looking for a confirmation. I'm a process engineer trying to figure out what to do with a vessel that has exceeded design temps on numerous occasions but never to the point of having the max allowable pressure exceeded for that temperature coincidentally.
Thank you
Yearn fer it, Learn it, confirm it, earn from it!