Vacuum vessel

[Plasmech]

Hello,

I am designing a 42" diameter pressure vessel that will be used for vacuum service. Internal pressure will be -13.75 psi. Spec'ing a tank head for internal positive pressure is pretty straightforward, but what about external pressure? Where can I find a good write-up about this? Currently I don't have access to ASME code, I imagine I'll be directed to section 8 division 1. Maybe there's something online? Thanks!

 

[SnTMan]

As soon as I hit "submit" I recalled a kind of rule of thumb sometimes used: If your cylinder allowable external pressure is less than 30 PSI, look at reinforcing for external pressure.

Like I said, just a rule of thumb.

Mike