×
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

Skidmore Verification of TC Bolts

Skidmore Verification of TC Bolts

Skidmore Verification of TC Bolts

(OP)
TC Bolts - AISC RCSC Code and ICC Code requirements for Not Slip Critical
Do TC bolts that are not called on plans as "SC" have to be checked for tension calibration with a Wilhelm Skidmore.

The Code reads, "a tension calibrator shall be used where bolts are to be installed in pretensioned and slip-critical joints"

RE: Skidmore Verification of TC Bolts

If TC stands for Tension Critical, which it might, why limit yourself to just a Skidmore device? There's torque wrenches (admittedly have to be calibrated) and several type of load indicating washers. Are these bolts already installed?

RE: Skidmore Verification of TC Bolts

After reading a bit in the RCSC Specification, I say yes. The commentary in section 7.2 even references tension-control (TC) bolts.

Also, my understanding (RCSC section 9.3) is that the only difference between PT and SC, pre-installation verification, installation, and inspection requirements is that the faying surfaces meet the specified criteria.

RE: Skidmore Verification of TC Bolts

A torque wrench should be calibrated to a Skidmore-Wilhelm tensioning device. As for the quality assurance if you are using load indicator bolts, it would be good to check a few with the Skidmore as well.

RE: Skidmore Verification of TC Bolts

What Ron said. You use the skidmore to calibrate your torque wrench. If you have many of these connections I would encourage the contractor to use DTI's and you check them with feeler gauge.

RE: Skidmore Verification of TC Bolts

TC bolts are the ones with the twist off spline that removes itself when the 'proper' torque is met. They are not tensioned with a torque wrench.



In theory, the fastener assembly should be tested in a skidmore to verify that it's producing the proper tension.

I think a strict reading of the RCSC document would even say that assemblies utilizing DTI washers need to be calibrated via skidmore to verify they're producing the desired tension.

IMO, the way the code reads does not limit skidmore calibration to torque wrenches only.

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