×
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

Bolt hole diameter smaller than diameter specified in ASME B16.5

Bolt hole diameter smaller than diameter specified in ASME B16.5

Bolt hole diameter smaller than diameter specified in ASME B16.5

(OP)
Can a smaller bolt diameter than the one recommended in ASME B16.5 be used to install a PRV valve, provided the manufacturer of the valve delivers bolting calculations to support this.
We received PRV's with 8" ASME B16.5 RTG flanged connection on the discharge side. The bolt hole diameter is 7/8" instead of 1" as required per ASME B16.5. We are looking at using 3/4" instead of 7/8" stud bolts.
Re-machining the bolt holes on site is not accepted by the manufacturer. They are arguing that by removing material from the flanges the valves would have to be dismantled and hydrotested.
Sending back the valves to the vendor to be re-machined is out of the question given the time contraints and country specific rules that prevent something imported to be "exported".
 

RE: Bolt hole diameter smaller than diameter specified in ASME B16.5

Yes, a flange can be calculated as per Appx 2. It could give you some headache, since the B16.5 flanges of this size don't really submit themselves to the method of calculations per Appx 2, but provided you use sufficient support area under the nuts ( very thick suitable washers), the smaller studs should be OK.
Cheers,
gr2vessels

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