×
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

ASME B16.5 design confirmation

ASME B16.5 design confirmation

ASME B16.5 design confirmation

(OP)
Sorry If I sound like a bit of a newbie here this is not really my line of expertise.

Is this slip-on flange design correct for a NPS20 inch pipe holding 1300 psi?

Regards,

RM

RE: ASME B16.5 design confirmation

A) At what temperature?
B) I doubt I would use any slip-on flange at that pressure.

Regards,

Mike

RE: ASME B16.5 design confirmation

(OP)
Thanks for the response Mike,

A) Its ambient temperature around 25C.

B) Could you elaborate why you wouldnt use it, and why would it be your first choice?

About that I also have a question on the standard that might be related, the copy I have says "slip on welding(NPS 1/2 to 2 1/2 only)" (right below the drawing on page 90)

But then they go ahead and give dimensions for them on all sizes, so its contradicting or I misunderstand.

Again thanks so much for the input.

RE: ASME B16.5 design confirmation

(OP)
typo...... B shouldave read

Could you elaborate why you wouldnt use it, what whould you use and why would it be your first choice?

RE: ASME B16.5 design confirmation

rmerlob, the note would appear to apply to socket-weld flanges only (my older copy says to 3 NPS).

For a slip-on flange the welds will be two fillet welds (corner joints) and they would probably be rather large. The stress concentrations are not especially desirable. They are hard to NDE. I would more likely use a weld-neck flange and butt weld it. This weld can be x-rayed.

Regards,

Mike

RE: ASME B16.5 design confirmation

(OP)

1) Thats very weird, in mine it seems to be pretty clear (see attached) but why would they give you the dimensions then.

2) yes I guess being able to x-ray it is a big plus.

Setting that aside for a bit did I use the standard correctly?

I mean ambient temperature+1300 psi+ASTM A516 gr 65+NPS20 gives you that flange?

I just want to make sure that if need be I can use the same process to use a weld-neck flange and be confident I'm doing it right.

Regards,

RM




RE: ASME B16.5 design confirmation

(OP)
BTW, of course I'm going to seek experienced help a bit later, this is some pre-project stuff, actually we have make an offer.

RE: ASME B16.5 design confirmation

rmerlob, 1) As I said, my copy is older. Interesting, I'd like to get a look at a current one.
2) Yeah, I'd say you read it right. Material, temperature, read off a pressure.

Good luck,

Mike

RE: ASME B16.5 design confirmation

(OP)
Thanks.

RE: ASME B16.5 design confirmation

Your attached dwg says B16.5-2003. Note that the latest edition of B16.5 is 2013.
Depending on your contract date, you'll probably have to stick to B16.5-2009.

RE: ASME B16.5 design confirmation

(OP)
Thanks xl83nl, do you know what differences the 2013 and 2009 edition has regarding this subject?

RE: ASME B16.5 design confirmation

Dont know

RE: ASME B16.5 design confirmation

rmerlob,

The material specified on your drawing is ASTM A516 Gr. 65. This is a plate material.

Plate material is only allowed for blind flanges and reducing flanges without hubs. Please read the following sections in ASME B16.5:
Paragraph 1.1(b)
Note (b) in Table 1A
Paragraph 5.1

RE: ASME B16.5 design confirmation

(OP)
Thanks doct very helpful

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