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inspectorjoe
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SS Pressure Vessel

11/15/2012 2:59 AM

Good day.

I am designing an air receiver using SS304. Do i need to add a corrosion allowance for SS vessels?
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PWSlack
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#1

Re: SS pressure vessel

11/15/2012 3:21 AM

It depends upon the process fluid(s), its/their temperature(s) and pressure(s).

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PWSlack
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#2

Re: SS pressure vessel

11/15/2012 3:41 AM

Most air receivers are constructed in lower-grade steels. Why 304 for this one?

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inspectorjoe
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#3
In reply to #2

Re: SS pressure vessel

11/15/2012 3:47 AM

Client requirement..
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PWSlack
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#4
In reply to #3

Re: SS pressure vessel

11/15/2012 3:48 AM

Based upon what?

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inspectorjoe
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#5
In reply to #4

Re: SS pressure vessel

11/15/2012 3:49 AM

ASME VIII Div 1
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PWSlack
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#6
In reply to #3

Re: SS pressure vessel

11/15/2012 4:21 AM

Why does this client want a 304 one instead of a carbon steel one? What is so special about this air? What is different about the piping system? - is it 304 too?

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PWSlack
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#7

Re: SS pressure vessel

11/15/2012 7:43 AM

What was the outcome of the initial discussion with the Engineer/Surveyor from the company providing burst indemnity insurance cover on the equipment?

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#8

Re: SS Pressure Vessel

11/15/2012 9:05 AM

Joe:

- Most air receivers are of carbon steel construction and meet ASME VIII or its equivalent. Stainless is an acceptable ( but expensive) alternate.

- All air receivers collect condensate which slowly corrodes the bottom of the carbon steel receiver. This corrosion problem is most often addressed by periodic blowdown of the receiver. This can be done via a tank drain manually, on a timed valve or via a sensor for liquid level.

- I would use a 20mm corrosion allowance for a SS receiver
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inspectorjoe
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#9
In reply to #8

Re: SS Pressure Vessel

11/15/2012 7:17 PM

Thanks bud..... you mean 2.0 mm...
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Codemaster
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#10
In reply to #9

Re: SS Pressure Vessel

11/16/2012 11:03 AM

20 mm does seem a little generous....

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Tornado
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#11

Re: SS Pressure Vessel

11/18/2012 3:01 AM

I'm even thinking 0.2 mm, but there may be some minimum standard thicker than that.

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