Stainless Steel for Oil and Gas piping
Stainless Steel for Oil and Gas piping
(OP)
Is stainless Steel not considered for produced water, injection water, lift gas, test separator water and oil outlets even if the chloride content and other process parameters allow ?
Does stainless steel face problems of under deposit corrosion in long run even if the chloride content in the flow is in tolerable limits of SS?
Does stainless steel face problems of under deposit corrosion in long run even if the chloride content in the flow is in tolerable limits of SS?





RE: Stainless Steel for Oil and Gas piping
RE: Stainless Steel for Oil and Gas piping
Also what should be the reason to reject austenitic.. ? and I have not seen my client using ferritic/martensitic...
RE: Stainless Steel for Oil and Gas piping
Is not 316 commonly used for oil and gas piping? Mo is added in this alloy to withstand attack by many industrial chemcials and solvents, in particular, inhabits pitting caused by chlorides. For those severe corrosion environmmnets where 316 is inadequate, 20Cb-3 is very economical choice available.
RE: Stainless Steel for Oil and Gas piping
RE: Stainless Steel for Oil and Gas piping
The Cl limits for 316 are a lot lower than most people think. I wouldn't go over 200ppm.
You have to watch out for issues like under deposit corrosion, crevice corrosion, and attack of welds.
In general if it is produced water with NO oxygen then a 5% Cr or 9%Cr alloy will work fine.
If you have Cl and oxygen then you have to balance the costs, either of using full time inhibitor injection or using a high alloy austenitic (6% Mo).
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P.E. Metallurgy, Plymouth Tube
RE: Stainless Steel for Oil and Gas piping
RE: Stainless Steel for Oil and Gas piping
Don't use a reference older than that.
There have been a lot of failures in 316 systems at 300-500ppm Cl.
Especially if there is CO2 to drive the pH down.
So this is two phase flow?
Are you sure that oxygen is below 0.2ppm?
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P.E. Metallurgy, Plymouth Tube
RE: Stainless Steel for Oil and Gas piping