Which external pressure stress chart should we use for 6063-T6 tubes? I couldn't find any chart for this material. Does this mean we cannot use this tube material for external pressures? Or is there a work around solution?
Assuming that you are fabricating a vessel or components in accordance with ASME Section VIII, Division 1:
If there is no Chart in II-D, then you have a couple of options:
1) Code Case 2286-6,
2) You prepare a Code Case to use the material in ASME Section VIII, Division 1 under external pressure,
3) Apply Appendix 46 and use the rules in ASME section VIII, Division 2, Part 4 - 4.4.