×
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 tighten in flanges
3

bolt tighten in flanges

bolt tighten in flanges

(OP)
Hello,
i need the tables which show the maximum torques in flanges with different diameters and bolts numbers!
pipes are ANSI 600

RE: bolt tighten in flanges

This data is highly dependant on your gasket.  So, what gasket are you using?  Why don't you ask your gasket manufacturer to provide their recommendations to you?

RE: bolt tighten in flanges

You should also consult ASME PCC-1.  Although it does not provide "maximum" torque values, it will give you some guidance regarding flange assembly, as well as some torque values.

RE: bolt tighten in flanges

Gasdealer,
Bolt material should be a factor for your consideration (not only gasket and bolt dimensions).

RE: bolt tighten in flanges

On 23 Apr 07 13:13, JLSeagull (Electrical) wrote:

Quote:


Check ASME B18.16.

transfered from duplicate thread 378-185007.

Patricia Lougheed

Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of the Eng-Tips Forums.

RE: bolt tighten in flanges

Tightening a bolt based on torque values can be quite risky as the torque is directly related to the coefficient of friction and can vary greatly with the amount and type of lubricant used (or the amount of sand and grit in the threads).  The best way to tighten a bolted joint is to determine the bolt load per bolt and then use that force to determine the elongation in the bolt and the rotation of the nut needed to seat the nut against the flange.

Ie  Bolt stress / Strain = E (or Stress / E = Strain) therefor: change in bolt length = Length * (Stress / E)

Knowing the pitch of the threads used, you can determine the rotation of the nut needed.

Regards,
CreativeVessel

RE: bolt tighten in flanges

CreativeVessel, while all you say is true, torque control is still the most widely used method of tightening bolts in gasketed joints, and I would not really charcterize it as "quite risky". None of which really answers Gasdealer's question:)

Agree with TGS4, see PCC-1.

Regards,

Mike

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