INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

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

Thermal Exp coeff for N08904

Thermal Exp coeff for N08904

(OP)
Dear All,
Iam re-designing an existing NEN type H.Exchanger (PVElite 2016) which was commissioned in 1970's.
Status:
1) Since this is NEN type, the entire Equipment has to be replaced, the change in Material being only the replacement of the Tubes from SS316L to Inconel 625 for which there was no issue from the design point.
2) Shell and Channel materials used were SS904L with UNS N08904 as per the existing datasheet. The client wants the exact materials to be used for the new equipment.
3) Bellows are used in existing H.Exch.
4) Since it is 24" dia & Pipe material (with UNS N08904), I used SB 677 for Shell/Channel.
5) When I run the report, even though the above mentioned materials (UNS N08904) are used in the Input & displayed, Elasticity/Expansion Material Properties display different UNS numbers (Nickel Alloy NO8020& N08810) for Shell/Channel/Bellows.
6) As per my understanding, in ASME Sec II, Part D & in PVElite material database, Thermal expansion rate is not available for N08904 materials. (In PVElite material database, "ElastAlp07", N08904 cannot be found). When enquired with the software support team, they asked to change the Material database manually for which I got some input from a manufacturer which is not sufficient.

Now,
1) Eventhough different materials are displayed in report, I suggested my client that SS904L (N08904) materials are readily available in the market and Equipment manufacturer can use the same during fabrication. (because the existing material is N08904 and still running fine). But Client wants it to be shown in PVElite design report which we cannot produce.

KINDLY SUGGEST ME, HOW CAN I CONVINCE MY CLIENT OR ANY EQUIVALENT MATERIAL EXACTLY SAME AS THAT OF N08904 CAN BE USED in PVElite?

WAITING FOR YOUR VALUABLE INPUTS/SUGGESTIONS.

Thanks & Regards,
Jay

RE: Thermal Exp coeff for N08904

If you look up the physical properties you will find that alloy 20 (N08020) and 904L (N08904) have nearly identical CTE (as well as other properties).
Show the data and explain why another alloy was used in calculation (limitations of data base).

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

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


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