External design Temperature 3

[PV design Engr]

Hello

I have a vessel to be designed for a external design temperature of 485 deg C( for some extreme case) I had chosen P11 as my Material of construction. For CS-2 chart the maximum allowed is 480 deg C. PV Elite shows the warning for the same. Please advise how to proceed for External design condition.

 

[SnTMan]

Lower design temp or pick another material.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[Chumpes]

Hello
@PV_design_Engr
You probably mean "a vessel to be designed for an external pressure considering design temperature = 485°C".
Without an external pressure, you can design pressure vessel with (external ?) design temperature above 480°C (up to 649°C if I remember well).
I agree with SnTMan, the easiest would be to have design temperature within CS-2 tables when designing for an external pressure.
Maybe it would be possible (but difficult) to operate at a higher temperature following ASME II-D rules for new materials (i.e. have the CS-2 graph extended to higher temperatures after testing and taking into account dimensionnal changes due to creep).
Regards