×
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!
  • Students Click Here

*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.

Students Click Here

Jobs

Coil in reactor under external pressure

Coil in reactor under external pressure

Coil in reactor under external pressure

(OP)
I've got a coil in a reactor. Conditions may be met such that the coil is under external pressure, hence the ASMI VIII Div 1 UG-28 calc.
MoC is ASTM A312 TP321/321H. High temp service (1000 F)

For the calculation of A and B factors, there's no chart in ASME II for determining these numbers.
How to proceed? May I use 304(L) or 316(L) as they have a more or less the same chemical balance?

RE: Coil in reactor under external pressure

Only "H" grades are permitted above (about) 600F.

 

RE: Coil in reactor under external pressure

(OP)
as it is dual certified, no problems there. I am using the H-grade. Also, it's for a calc for B31.1, and since it's external pressure, I ended up in ASME VIII Div 1 UG-28. Do you know about the charts im after, blacksmith?

RE: Coil in reactor under external pressure

Cylinder with external pressure.  Easier to use the PRESSURE VESSEL HANDBOOK, but same stuff us in Sect VIII Div-1

Your external calc should end up about half the psi as internal,  Easy check.

RE: Coil in reactor under external pressure

(OP)
Who's the author of the book you're referring to? By the way, I do the external preesure calc for the cilinder based on the computated wallthickness of the internal pressure, which includes an erosion/corrosion allowance. Is that assumption/path forward correct, or should i neglect the erosion/corrosion allowances for the external pressure calc, and add those allowances after the external pressure calc is finished?

RE: Coil in reactor under external pressure

"Pressure Vessel Handbook" 14th Ed.  Eugene F. Megysey.  Highly, highly recommended.  Don't design vessels without it.

Either calc works, I think -- but I add in the Corrosion Allowance - C.A. after I establish min thickness - Tmin

RE: Coil in reactor under external pressure

(OP)
PS: just found the answer I was looking for. It's in the tables of II-D. There's a separate column for every material showing which external pressure chart applies. The book by Megyesy is very valuable, def gonna purchase that!

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