INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

C- 1/2 Mo Availibility

C- 1/2 Mo Availibility

(OP)
Working a proposal for replacement of an old S&T exchanger, materials as noted. I've not dealt with this stuff before, so can anyone tell me, in general is this stuff available?

Usual product forms, plate, pipe, forgings, tubes, B16.5 flanges.

TIA,

MIke

The problem with sloppy work is that the supply FAR EXCEEDS the demand

RE: C- 1/2 Mo Availibility

I'm sure it's around somewhere out there, but generally speaking, C-1/2 Mo has been replaced with 1-1/4 Cr materials due to HTHA concerns (the old Nelson Curves had a C-1/2 Mo line that's since been removed since there were enough failures below it). Have had serious problems tracking down materials for repairs to C-1/2 Mo vessels.

Personally wouldn't even consider it an option for a new vessel.

Nathan Brink

RE: C- 1/2 Mo Availibility

(OP)
NBrink, thanks, I'll alert the sales guys :)

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

RE: C- 1/2 Mo Availibility

These tubes can still be found in the USA. They are still used in boiler applications.

RE: C- 1/2 Mo Availibility

Ugh, why? 1-1/4 Cr won't be that much more, and will have higher creep strength and be immune to FAC...

Anyhow, I've had a devil of a time finding plate...

Nathan Brink

RE: C- 1/2 Mo Availibility

C-1/2 Mo boiler tubes were commonly used in the boiler industry, and started from the oil field industry. However, this material fell out of favor with most because the C-1/2 Mo has been prone to graphitization failures in elevated temperature service.

RE: C- 1/2 Mo Availibility

(OP)
Actually there are two exchangers, almost identical designs, vintage mid 70's. Customer requests "Replace in kind", which means, no one ever knows exactly what :)

These designs use several thicknesses of plate, from thick to thin, body flange forgings, B16.5 flanges, pipe and tube all from C-1/2 Mo. I am always leery about availability with materials I don't use all the time, after all there is a reason they're not common.

I have run the designs as C-1/2 Mo, and am going to let sales & estimating know availability may be a problem. I would guess substitute materials will need to be approved by the customer. I'll let 'em have at and re-run the designs again later if needed.

Thanks again,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

RE: C- 1/2 Mo Availibility

Plate availability is a different problem. You can find high strength, Manganese - Moly plate but it might not be suitable for your design parameters.

WBrink, I do not dispute your statement at all, only to indicate the availability of C-1/2 Mo and 1/2Cr-1/2Mo tubing which we have used in boiler repairs with like tubes.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources

White Paper: Introduction to Multi-patterning
As the semiconductor industry races to keep pace with Moore’s Law, which regards the doubling of transistors per square inch on integrated circuits, lithography hardware systems are not always able to provide a quality image for creating circuits. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close