Engineering against multiple environments
Engineering against multiple environments
(OP)
This is a more general question since process info is variable. We utilize a spray nozzle of c276 with a cast CW2M low pluggage spray nozzle to quench a so2+n2 (0-3% o2) from 2300 F to 225 F). The quenchant is sulfurous water from a downstream unit laden with chlorides with a pH of 4-6 at 124 F.
At a very primitive level what materials are evaluated when HT corrosion, dew point corrosion, Chloride and sulfide stress cracking and pitting, weak sulphuric acid pitting, and HAZ dealloying are in play?
This question is probably silly but our site doesn't have SME experts and the OEM, corrosion lab, existing literature, and previous trials have all turned up dead ends.
At a very primitive level what materials are evaluated when HT corrosion, dew point corrosion, Chloride and sulfide stress cracking and pitting, weak sulphuric acid pitting, and HAZ dealloying are in play?
This question is probably silly but our site doesn't have SME experts and the OEM, corrosion lab, existing literature, and previous trials have all turned up dead ends.
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RE: Engineering against multiple environments
Then you might want to add a lining / cladding / weld overlay of SS 316.
You need to know the velocity of the fluids that are involved, also if erosion is a dominant factor.
DHURJATI SEN
Kolkata, India
RE: Engineering against multiple environments
If you have any Cl present at that pH and temp there is no place for 300SS anywhere in the system.
The exception would be alloys like 310 in the hot end.
You need a reference for HT corrosion, with sulfidation what I would worry about first.
Start with the ASM publication by G. Lai.
And once you are below 300F I would worry about acid condensation.
If it were just S and N I wouldn't worry much, but with lots of Cl this could be severe.
For the intermediate temps CS (watching out for SSC) is a decent option.
With the stuff in your gas a lining may be needed.
For the lower temp end coatings (paints) may work very well.
For hotter areas it gets more complex.
Start by dividing the system into zones based on temp, flow conditions, and such.
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P.E. Metallurgy, consulting work welcomed
RE: Engineering against multiple environments
I'm pretty well versed in ASM. Unfortunately no one ever writes about this hell process.
Appreciate the comment!