Wet CO2 piping material
Wet CO2 piping material
(OP)
I'm in the early stages of investigation on a project using CO2 for EOR. The CO2 may have some moisture initially, but when the oil is being extracted through the wells, there will be oil, gas, and water. Therefore, all the CO2 separating equipment will be exposed to wet CO2.
The options that I am considering for piping materials are coated carbon steel, and I'm investigating 304 and 316 SS. The information I've looked at is leaning towards using 316.
Is this a good choice for a piping material? The system will be seeing temperatures of up to 300 degrees F and pressures up to 2500 psig. The higher pressures will see separated and dry CO2 but the lower pressures will definitely see wet CO2.
Thanks in advance,
Viewsonic
The options that I am considering for piping materials are coated carbon steel, and I'm investigating 304 and 316 SS. The information I've looked at is leaning towards using 316.
Is this a good choice for a piping material? The system will be seeing temperatures of up to 300 degrees F and pressures up to 2500 psig. The higher pressures will see separated and dry CO2 but the lower pressures will definitely see wet CO2.
Thanks in advance,
Viewsonic





RE: Wet CO2 piping material
Thread338-120479
The principal parameter will be the chloride content of the water. If you get formation water, it may be too high for 316L (refer Bruce Craig chart in referenced thread). Having solved that issue, then it is time to consider the external environment. The indicated temperature is way above the usually quoted Cl- SCC threshold for 316L, therefore, there is a risk of cracking. Some companies will hold that an organic external paint system is good enough to provide protection, others will propose that thermal spray aluminium is the only coating that can be used. That issue will be another discussion thread.
Good luck.
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/
RE: Wet CO2 piping material
Yes I was referring to ASME 31.3 piping. And the information I've gathered so far is leaning towards the coated carbon steel being less attractive. The coating manufacturer the client suggested has a spool length capability of 10' and simply looking at construction of the piping would be fairly expensive with just welding. Once the pipe is welded, coated, and then painted, I'm sure it will be more expensive than going with SS.
The people I've been talking to have been suggesting that I'll likely be fine with 316 SS over 316L or the 304 series. I just wanted to see if there were any obvious problems with suggesting 316. I'm not sure of the chloride content in the water, but I'm inclined to not suggest a low carbon SS primarily because of the reduced allowables per 31.3 and the cracking issues.
Thanks for the input.
RE: Wet CO2 piping material
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/
RE: Wet CO2 piping material