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A carbon steel bundle from the overhead condenser in the crude unit operates at 300 F and is in hydrochloric acid service. It showed severe pitting type corrosion when pulled for inspection. What type of material would be best suited for this service?
Suggested Answer: D
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32 comments · newest first
NO
Nobuko
10 months ago
Not sure if 316 is enough for severe pitting, though.
HO
Hortencia
10 months ago
Definitely agree with 316 stainless steel for hydrochloric acid service.
KE
Kent
10 months ago
I think 9Cr-1Mo could handle the heat better.
TA
Tabetha
10 months ago
Titanium? Really? That seems overkill for this situation.
DO
Dorsey
10 months ago
316 stainless steel is known for its corrosion resistance in acidic environments.
IN
India
11 months ago
I recall that 5Cr-0.5Mo is often used for high-temperature applications, but I’m not sure how it performs in hydrochloric acid. I think stainless steel is safer.
LE
Leontine
11 months ago
I feel like we had a similar question in practice about materials in acidic service. I think 9Cr-1Mo was mentioned as a potential candidate, but I’m not confident.
NU
Nu
11 months ago
I'm not entirely sure, but I think titanium could handle the corrosion better than the others. It’s more resistant, right?
HO
Hollis
11 months ago
I remember we discussed that carbon steel isn't great in acidic environments, especially hydrochloric acid. I think 316 stainless steel might be a good option here.
IL
Ilda
12 months ago
I'm a bit unsure about the 5Cr-0.5Mo and 9Cr-1Mo options. I'll need to research their corrosion resistance in hydrochloric acid service to make a confident decision.
PE
Pearly
12 months ago
Titanium could be a good choice here, but it might be overkill and more expensive than necessary. I'll have to weigh the pros and cons.
YV
Yvonne
12 months ago
Okay, I know pitting corrosion is a major issue in acidic environments. I'm leaning towards 316 stainless steel since it has good corrosion resistance.
LE
Leeann
1 year ago
Hmm, this seems like a tricky one. I'll need to think carefully about the corrosion resistance properties of each material option.
ER
Eric
1 year ago
Hold on, did someone say 'overhead condenser'? I bet the engineers were just daydreaming about their next vacation when they designed this thing. Better bring a snorkel for that acid shower!
EL
Elenora
1 year ago
Hmm, I'm not sure 5Cr-0.5Mo would be robust enough for this service. Seems like it might be a bit too lightweight for the job. Time to beef up the alloy content!
BE
Berry
1 year ago
User 2
BU
Burma
1 year ago
User 1
HA
Hailey
1 year ago
User 2: Yeah, I agree. It's important to have a material that can withstand the harsh conditions.
TW
Twila
1 year ago
User 1: I think 9Cr-1Mo would be a better choice for this service.
BE
Belen
1 year ago
I'm going with 316 stainless steel. It's a classic choice for corrosive services and should hold up well to the pitting issues. Just hope the cost doesn't blow the budget!
DA
Danilo
1 year ago
User 2: Agreed, it's a reliable option for corrosive environments.
SA
Santos
1 year ago
User 1: I think 316 stainless steel is a good choice for this.
CA
Carey
1 year ago
Titanium is a great option here. It's highly resistant to pitting and crevice corrosion, even in aggressive acid environments. Plus, it's lightweight and easy to fabricate.
MO
Mona
1 year ago
A: It's also lightweight and easy to work with, which is a bonus.
AL
Alise
1 year ago
B: Yeah, titanium is known for its resistance to corrosion in acid environments.
CE
Ceola
1 year ago
A: I think titanium would be the best choice for this service.
PE
Pete
1 year ago
Why do you think 9Cr-1Mo is better?
TH
Theodora
1 year ago
I think 9Cr-1Mo would be the best choice for this application. The high chromium content provides good corrosion resistance in hydrochloric acid, and the molybdenum addition further enhances the corrosion protection.
AV
Avery
1 year ago
I think Titanium might also be a good option for its corrosion resistance properties.
SH
Sharen
1 year ago
I agree, 9Cr-1Mo is a good choice for hydrochloric acid service.
DE
Devora
1 year ago
I disagree, I believe 9Cr-1Mo would be more suitable for this service.
PE
Pete
1 year ago
I think 316 stainless steel would be the best choice.