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inspectorjoe
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Join Date: Apr 2008
Posts: 50

ANSI Standard

07/07/2010 2:44 AM

We were task to do an evaluation of a fatty alcohol process plant where most design pressure of pipelines ranges from 300-350 bars and design temp is 435 deg C. Which ANSI standard is applicable for this application?
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Anonymous Poster
#1

Re: ANSI Standard

07/07/2010 2:53 AM

You should be able to get by with 'regular' ASME/ANSI B31.3 Process Piping with ASME B16.5 Class 2500, if not, then go with ASME B31.3 Chapter IX - 'High Pressure Piping'
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inspectorjoe
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#2
In reply to #1

Re: ANSI Standard

07/07/2010 3:35 AM

Thank you very much for your quick response.

This place is really very reliable and fast...
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inspectorjoe
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#3
In reply to #1

Re: ANSI Standard

07/07/2010 4:12 AM

Going thru 31.3 chapter IX, what would i use for value of "C"......what is the common value of "c" used for the minimum thickness???
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Anonymous Poster
#4
In reply to #3

Re: ANSI Standard

07/07/2010 10:01 AM

If you are referring to 'c' = sum of mechanical allowances,

then it depends on if the piping is threaded/grooved/etc... + the corrosion allowance that you want/need to specify. That is completely dependent on the actual service, the expected rate of corrosion, and the required design life. There is no 'common value', but for rather benign, oil service, 1/8" would be quite conservative.
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Abdel Halim Galala
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Engineering Fields - Piping Design Engineering - New Member Egypt - Member - Member since 02/18/2007

Join Date: Feb 2007
Location: Cairo, Egypt
Posts: 1733
Good Answers: 248
#5
In reply to #4

Re: ANSI Standard

07/07/2010 11:01 PM

Good Answers Guest for your posts #1 and #4.

• I like to add that the corrosion allowance C depends on the type of fluid, its concentration, temperature, and ofcourse type of piping material. Therefore, may be you can use a carbon steel pipe ASME SA 106 Grade B or you can use stainless steel SA 312 (just an example), so we need to define exactly the corrosion rate and the design life of the system. May be you have some records for the corrosion rate for a similar process (same fluid, same pipe material, same temp. and same concentration) in the plant, where it is allowed to apply that corrosion rate. Or you can use NACE code Corrosion Data Survey - Metal Section to find the corrosion rate.

• Corrosion Allowance = Corrosion Rate per year x Life time in years

• You can maximize that rate if there is another causes resulting in thinning of pipe wall thickness like as erosion, ... etc.

.....................................

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