×
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

Insert plates

Insert plates

Insert plates

(OP)

Dear Experts,

I'm designing a pressure vessel (U stamp) that contains insert plate instead of reinforcing pads.
It is my first time that I use this kind of reinforcement.
My inquiry is about the method of mounting on the pressure vessel and which method of design shall i follow?

Thanks in advance.

RE: Insert plates

MANS1987, you do know insert plates are butt-welded to the vessel don't you?

For nozzle reinforcing follow UG-37, see also Fig UG-40 (f),(g),(h) and also Fig. UW-16.1 (f-x).

Note these figs show integral nozzles, but I suppose it need not be. However the reason insert plates would generally be chosen is to avoid non-radiographable corner joints. Best study your specs closely.

Regards,

Mike

RE: Insert plates

(OP)
Thank you SnTMan for your prompt response, i know that insert plate are butt-welded.
But what i m asking about is not the integral nozzle configuration, i'm talking about the calculation of the thickness of this insert plate. how it will be calculated?? it's like the reinforcing plate calculation ( By Area replacement?? ASME cover like this issue??

RE: Insert plates

MANS1987, in UG-37, it is treated as a pad would be, that is, part of the neck is considered as a reinforcing element. See the figures in UG-40 to establish dimensions of the element, especially thicnkess te.

Regards,

Mike

RE: Insert plates

MANS1987-

Simply put, if you are comfortable designing re-pads then you are used to calculating A1 (area available in shell) and A5 (area added in reinforcing element) per UG-37. From a UG-37 design perspective, all that happens when you are designing an insert plate is that you eliminate A5 and increase A1. So for a design procedure, you could design a repad, then take the OD of the repad and use that for determining the diameter of an insert plate. The thickness will be the nominal shell plate thickness plus the thickness of the imaginary repad. Don't forget to allow for a 3:1 taper for the insert plate to shell transition. The insert plate will likely be rectangular with rounded corners. That's fine, just be sure that the dimensions are larger than the OD of the imaginary repad.

Taking it a step further - adding a bit of complexity but potentially reducing steel weight, with an insert plate (and heavy wall nozzle if applicable), you are eligible to use the F factor in Fig. UG-37.1 to reduce the area required in the plane of the circumferential joints. Put another way, for a radial nozzle in a vertical vessel, the insert plate's horizontal dimension could be reduced. Most vessel designers have never taken advantage of this, and most clients would never know it exists. So no problem using F=1 (that's conservative) but the option exists.

RE: Insert plates

(OP)
Thank you very much jte and SnTMan for your help

Regards

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