Material Selection for Co2 gas

[nrupendra]

Dear All,



Please suggest the compatible material ( LTCS + C.A (1.5 mm) / SS 304) for following Condition of Co2 Gas pipeline.

1) Co2 gas purity = Vol % ( Min )= 99.98 %
2) Pressure = ( Kg/ Sq. Cm-g) = 24- 40
3) O2 content = 30 ppmv ( Max.)
4) Total Chlorides = 50 ppbv ( Max.)
5) Light Hydrocarbons= 1 ppmv ( Max.)
6) Ethylene Glycol = 1 ppmv ( Max.)
7) Total Sulphur = 0.1 ppmv ( Max.)


Please advise on basis for selection of corrosion model to be used to calcite the corrosion rate.

 

[Chumpes]

hello
no water = no wet CO2 corrosion
is there any water in your system ?
what is the temperature ?
what is the total pressure ?
I guess DeWaard&Milliam is the most popular model for calculation of corrosion rates by wet CO2.
regards

 

[nrupendra]

Thanks a lot
No water in system.
Operating temp 45Deg C.
Total pressure = 41.03 bar(g)


Regards

 

[EdStainless]

How much 'no water'? What is the Dew Point?
There have been a number of paper published on dW&M with minor updates and added details.


= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

 

[LittleInch]

With NO FREE WATER in the pipeline, you have no corrosion mechanism. Therefore use Carbon Steel

with any free water in a 99.9% CO2 system you will have lots of corrosion in a Carbon Steel pipeline.

Then start to worry about the fracture toughness at minus 50C...

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[SJones]

https://www.dnvgl.com/oilgas/downlo...nd-operation-of-carbon-dioxide-pipelines.html

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/in/drstevejones

All answers are personal opinions only and are in no way connected with any employer.