Pitting corrosion in oil and gas
Pitting corrosion in oil and gas
(OP)
Good morning to all (Italian time).
I would like to talk about pitting corrosion in oil and gas applications.
Taking in consideration 316SS and a wet stream with an important amount of salinity (dissolved chlorides),
from my academic studies I know that without oxigen, and the relevant cathodic reaction, pitting corrosion doesn't take place.
these are my questions:
1. On a material selection report, is it correct to state that, also in presence of high quantity of chlorides, pitting corrosion doesn't take place?
2. In oil and gas application, which are, if any, other species (except oxigen) that can generate a cathodic reaction in order to have pitting corrosion?
Thanks in advance for your answers
I would like to talk about pitting corrosion in oil and gas applications.
Taking in consideration 316SS and a wet stream with an important amount of salinity (dissolved chlorides),
from my academic studies I know that without oxigen, and the relevant cathodic reaction, pitting corrosion doesn't take place.
these are my questions:
1. On a material selection report, is it correct to state that, also in presence of high quantity of chlorides, pitting corrosion doesn't take place?
2. In oil and gas application, which are, if any, other species (except oxigen) that can generate a cathodic reaction in order to have pitting corrosion?
Thanks in advance for your answers





RE: Pitting corrosion in oil and gas
http://corrosion-doctors.org/Electrochemistry-of-C...
RE: Pitting corrosion in oil and gas
And even then the amount of oxygen that it takes to for these reactions is very low.
Using 316 in this environment is a fools errand.
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
RE: Pitting corrosion in oil and gas
2. Hydrogen ions generated by dissolved acid gases
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Pitting corrosion in oil and gas
Could I apply the same considerations to the chlorides stress corrosion cracking?
I guess yes!
Thanks and regards
RE: Pitting corrosion in oil and gas
RE: Pitting corrosion in oil and gas
RE: Pitting corrosion in oil and gas
I move from 316L to a lean duplex
1. Better pitting resistance
2. significantly better CSCC resistance
3. Higher strength, so I use thinner walls and less metal
4. Lower overall cost (if I take advantage of the higher strength
Not moving to a lean duplex from 316 is bad decision.
Unless you are operating over 600F or under -40, or need to do severe forming I don't see any reason to use 316L.
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
RE: Pitting corrosion in oil and gas
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"