The composition and properties of engineered construction materials is readily available in published literature and (gasp) on the WWW, from vendors, etc.

Many new users have untimely, suddenly and awkwardly stopped using engtips.com because of Cronin Sir's enthusiasm and appreciation.

These guys want to be a hero in the eyes of their bosses and peers in no time and bargained on the expertise of other users of engtips.

Cronin Sir is mostly right.

But does he have a bias against the third world guys? This malady has engulfed the whole world, just like Covid.

DHURJATI SEN

Faheem,

Short answer is No, it's not a good idea by the look of it as you are replacing a basically Nickel (60%) Chromium, molybedenum, Copper alloy with a basic low carbon steel alloy used for structural steel. I assume there must be a reason you've got nickel plate in your tank and replacing it with something different isn't a great plan.

Now if that is suitable or not I don't know and your materials engineer will tell you, but come on - finding out what the composition is is a few minutes on the internet....

Typical here: https://haynesintl.com/docs/default-source/pdfs/ne...

http://www.steelplatesforsale.com/blog/SS400-steel...

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

Like all of my postings, my statement of July 18th is only my opinion .... You do not have to agree !!

It would be really, really nice if you answered a few of our questions

Again:
1) What is your Code of Construction ?
2) Does your Construction Contractor offer ANY justification for his sleazy material substitution ?
3) Who benefits financially from the substitution of the inferior, weaker (and cheaper) material ? .... You ? ... or someone else?
4) Will the young newbie field engineer be again blamed when there is a failure during hydrotest ?

.... and, on behalf of LittleInch:

5) What did your Materials Engineer tell you when you asked about the substitution ?
6) Why did you originally have a "Nickel (60%) Chromium, molybedenum, Copper alloy" plate material for this tank ?

Finally "WHAT IS THE TANK'S PURPOSE - WHAT WILL IT CONTAIN ? - WHAT TEMPERATURES AND PRESSURES ????"

Oh, ... and I am deeply sorry if I have hurt the feelings of any grown men with my mean english words ...

Again, this is my opinion only

MJCronin
Sr. Process Engineer

At least he didn't say that he had an MBA....

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

Ouch !!!! ... Like I have said in other posts, I am cranky, elderly and occasionally get off my meds !!!

HR-235(UNS N06235)is a premium CRA material that was developed by Haynes International for high temperature usage. Details here:

https://haynesintl.com/docs/default-source/pdfs/ne...

The intended industry applications (by Haynes)are:

• Petrochemical Plants
• Syngas production
• Synthesis of ammonia, methanol, LNG, H2
• Microchannel High Temperature Reactors
• High carbon containing gases
• Direct reduction of iron ores
• Carbon fiber production
• Gas-to-liquids (GTL) plants
• Steam-methane-reforming process

Usage in API 650 Storage Tank constuction was previously discussed (kinda) in this thread:

https://www.eng-tips.com/viewthread.cfm?qid=314577

Again we seem to have "Third World" newbie confusion that we are asked to correct ...

I am guessing here that Najeeb is new to storage tanks and is mixing up CRA pressure vessel materials with simple carbon steel materials

Agree ???



MJCronin
Sr. Process Engineer

As expected, and right on time ....

Faheem didn't get what he wanted and has dropped this thread like a hot potato

MJCronin
Sr. Process Engineer