Jacket MAWP, no stamp?

[DCooke]

I am looking at buying a used jacketed tank for use in our process (8' dia, 14' straight side length, SS tank and CS jacket). The jacket covers the sides of the vessel only and extends from the bottom to about 8 ft up the side. Neither the vessel nor the jacket are stamped. Our application would require 70 psig steam.

Should I need to treat both the jacket and tank as sub-15 psig vessels? Is there any case that a hydrotest of the jacket would be sufficient evidence for integrity? I live in a state that only has boiler laws, not pressure vessel laws, so I'm asking not about what's legal but what's safe.

 

[mk3223]

For operation safety, the PVRV's may be added to protected the tank as well as the jacket. For the steam jacket operation, the full vacuum design should be applied for both tank and jacket. The hydrotest of the jacket could only good for the tank itself.