sweet corrosion in gas transmission
sweet corrosion in gas transmission
(OP)
What is the most suitable steel pipe material spec's for preventing sweet corrosion?
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sweet corrosion in gas transmission
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RE: sweet corrosion in gas transmission
In the North Sea Norwegian sector, the oil companies use pipes with more 13% chromium if the CO2 level is high and the H2S level is low. If you have water in the pipe together with O2, then forget about carbon steel unless you have some sort of cathodic protection.
It might be usefull to check out duplex-sttels as well, if the temperature is above 40deg C (or 100deg F) and the pipe is in contact with chlodies and water.
RE: sweet corrosion in gas transmission
RE: sweet corrosion in gas transmission
If your CO2 is low then carbon steel or a 13%Cr grade might be the better options. At that temp I doubt that CS will be suitable though.
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Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm
RE: sweet corrosion in gas transmission
RE: sweet corrosion in gas transmission
Xda
At a seminar a couple of years ago, CLI-FAFER (french company?) presented a case where they used 12-13% Cr steels at temperatues up to 212deg F (100deg C) with pressure of CO2 up to 290psi and pH as low as 3,5.
Ask a stainless steel supplier about thay think when you give them your data of the fluid. (content CO2, pH, pressure etc., length of pipe (line?)) Remember you might save weight and cost if the alloy is strong and stainless. The wallthickness can be reduced bacause of strength of the SS alloy compared to using a carbon steel alloy with cathodic protection (that also needs extra wallthickness due to corrosion)
RE: sweet corrosion in gas transmission
fyi, this is single phase, 45%mol CO2, saturated water is 680 lb/mmscfd.
RE: sweet corrosion in gas transmission
RE: sweet corrosion in gas transmission
http://www.standard.no/imaker.exe?id=1369
Concurrently, the feasibility of chemical treatment and associated operations such as pigging can be investigated and some costs obtained for life cycle evaluation. Pipeline burial requirements play a part as the stainless steel will, like the carbon steel line, have to be coated and subjected to cathodic protection. It's a bit too involved to go into here. ISO 15663 gives guidance on life cycle costing.
Steve Jones
Petroleum Development Oman LLC
Muscat
Sultanate Of Oman
RE: sweet corrosion in gas transmission
This is a very complex matter, and companies spend lots of time and money in the decision as to what is the best way to go.
My first recommendation to you is to decide what is most important to you. Up-front CAPEX or lowest life cycle cost? When you start looking at material factors of 3 to 7 times that of carbon steel, many project managers get 'concerned'. Even when you can show a life cycle cost benefit for CRA, it is often hard to get support when it costs the project more up front - that's my experience anyway.