air receiver corrosion allowance ASME VIII Div 1
air receiver corrosion allowance ASME VIII Div 1
(OP)
Is there a minimum corrosion allownce for air receivers in ASME Section VIII Div 1 ? I can not locate this requirement.
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air receiver corrosion allowance ASME VIII Div 1
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RE: air receiver corrosion allowance ASME VIII Div 1
The instrument air is normally dry, the corrosion allowance is not required.
It depends much on the vessel specification, if you asked or not for internal surface treatment, blast cleaning or left it with mill scales, painting, etc..
gr2vessels
RE: air receiver corrosion allowance ASME VIII Div 1
I admire your optimism! :)
Yes, instrument air *should* be dry. But that's not always the case... Coatings *should* prevent corrosion, but small coating failures can cause major headaches if the vessel has no corrosion allowance to work with. I'd go with 1/16" min CA and consider using 1/8" CA on the bottom head.
Section VIII provides no guidance for setting CA's so the designer is stuck with using industry experience combined with good engineering judgement by your friendly local metallurgist.
jt
RE: air receiver corrosion allowance ASME VIII Div 1
cheers,
gr2vessels
RE: air receiver corrosion allowance ASME VIII Div 1
I agree with your perspective, but wonder how much adding a 1/16" CA adds to the delivered price of the 4' x 12' receivers?
Just don't get me started about mounting the recip compressor directly to the knuckle of the top head with intermittent fillet welds!
jt
RE: air receiver corrosion allowance ASME VIII Div 1
Regards,
athomas236
RE: air receiver corrosion allowance ASME VIII Div 1
regards
rhg
RE: air receiver corrosion allowance ASME VIII Div 1
It is a little off topic, but both ASME and Occupational Safety and Health Administration (OSHA) requires a bottom drain at the lowest point of every air receiver to mitigate corrosion.
Federal Law 29 CFR 1910.169(b)(2) describes this.
In ASME review Section VIII, Div. 1, paragraph UG-25(f) requires a suitable drain opening in such vessels.
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Also see:
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Some people offer galvanized recievers to extend the usefull life:
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My opinion only
-MJC
RE: air receiver corrosion allowance ASME VIII Div 1