Fracture Propagation and Fracture Control for superctitical CO2 piping 2

[tag10]

I want to choose the material for a supercritical CO2 piping.
The CO2 stream composition is:
- Carbon dioxide (CO2) Vol% > 99.6
- Water (H2O) ppmv < 500
Parameters are:
T > 40 degrees C;
P > 120 bar;

If the corrosion rate of supercritical CO2 piping is lower (until now I have no confirmation), then I will have to take into consideration all scenarios (for example depressurizing CO2 from high pressure)...

As you know, Fracture Propagation and Fracture Control are big issues, in order to choose the BEST CARBON STEEL piping material... Can you recommend me a document or a software, in order find more info, regarding to Fracture Propagation and Fracture Control for supercritical CO2 piping.

Thank you very much for your advice.

 

[blacksmith37]

Good toughness microalloy (Nb, Ti, V, etc)steel helps but fracture arrestors are still needed. Years ago the choices were a "clock spring" wrapped around the pipe or a thick collar welded around the pipe every few joints . The fracture can run faster than the pipe can depressure (transmission type lines).

 

[tag10]

Mr. blacksmith37,

Do you know a software or a link to a interesting document, in order to estimate the Fracture Propagation (in case of depressurizing CO2 from high pressure). Any info could help me. Thanks.

 

[stanweld]

Battelle Memorial Labs performed and published numerous studies for the AGA during the 70s and 80s. Formulas were developed to define minimum impact properties to arrest ductile shear fractures.

 

[metengr]

You might want to review this article

http://pipelineandgasjournal.com/safe-pipeline-transmission-co2?page=show

 

[SJones]

If you are using DNV-RP-J202 you will know that the most frequently adopted approach in the US is to install fracture arrestors simply because the decompression modelling for CO2 will be a research project in itself. There are numerous papers on the subject along with a substantial amount of ongoing research. An exemplary article for reference is:

A Cosham, R Eiber, Fracture Propagation In CO2 Pipelines, Journal Of Pipeline Engineering, Vol 7, (4), 2008, pp281-292

Of particular note is the apparent paradox to hydrocarbon pipelines in that lower pressures and higher temperatures can be more severe. What the paper will also show you is that surfing a forum such as this for design assistance may not be the most effective approach.

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04