Vacuum design of vessel
Vacuum design of vessel
(OP)
I was calculating the safe thickness of a closed dome ended cylindrical tank subjected to vacuum of 20 inches Mercury and normal atmospheric pressure outside. The length between lines of support is 6000 mm and the vessel dia is 60". Material is SA516 Gr-60. The thickness of the shell is about 10 mm.
I am struck because the thickness of the domes is 5 mm and isolated external corrosion with RWT of 3 mm. Could some one please help me to evaluate the tank.
- Should the calculations be performed with 3 mm as thickness for whole tank? or
- Evaluate the domes separately considering them as sphere with 3 mm thickness while evaluating shell as cylider with 10 mm thickness?
- Also please suggest if a patch plate is welded externally over the corroded area, could the thickness of the dome be considered as 5 mm for the full dome.
Thanks in advance
I am struck because the thickness of the domes is 5 mm and isolated external corrosion with RWT of 3 mm. Could some one please help me to evaluate the tank.
- Should the calculations be performed with 3 mm as thickness for whole tank? or
- Evaluate the domes separately considering them as sphere with 3 mm thickness while evaluating shell as cylider with 10 mm thickness?
- Also please suggest if a patch plate is welded externally over the corroded area, could the thickness of the dome be considered as 5 mm for the full dome.
Thanks in advance





RE: Vacuum design of vessel
Steve Braune
Tank Industry Consultants
www.tankindustry.com
RE: Vacuum design of vessel
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