High pressure natural gas treatment plants

[chemmobile]

Typical natural gas treatment plants (removing H2S, CO2 and H2O) work with pressure 10 MPa or less. Have you met plants designed for higher pressure (15 - 20 MPa)? If exist, what disadvantages they have?

 

[MortenA]

-cost - 10 MPa just around the #600 limit
-Pipeline pressure: Most pipelines in Europe operates around 70-80 barg
-Process: NG tends to go into dense phase around 100 barg. Som of these processes may not work as well then?


Best regards

Morten

 

[dcasto]

I've operated 1800 psi TEG units no problem. The treaters will work, I just do not know if the reaction and absortion data exists to acurately predict what happens at 15 to 20 MPa.

As for dense phase, just means a little bigger separator, nothing bad will happen.

 

[MortenA]

OK - but the other two items are still correct I THINK.

You will have to install #900 flanges and most pipelines in Europe will allow #600 systems.

Best regards

Morten

 

[gr2vessels]

It seems that the most economical rating is the 600#, pressure and temperature rating per ASME B16.5. However, we have had recently to employ some Norsok flanges for the extreme ratings under the 600# class, particularly for those 30" (and larger) flanges, in order to keep the costs under control. I subscribe to the limit of 600#, otherwise the cost goes thru the roof...There is also another limit, for the Austenitic Steel sections, which have lower rating limit or the option of Duplex and higher...
cheers,
gr2vessels