×
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

Transformer cover plate bolt torque

Transformer cover plate bolt torque

Transformer cover plate bolt torque

(OP)
Dear All,
What should be tightening torque  for the cover plate bolt for 50 kVA sealed type transformer?   the cork packing thickness is 6 mm and bolt type is 10Mx40mm.  Spacing between two bolts is 50 mm. Flanger openning is 940x396 mm . Width of flaner is 50mm. Strenth class of the bolts is 4.8

Thank you.
BR
 

RE: Transformer cover plate bolt torque

In addition to the normal torque considerations for bolts, you also need to consider the gasket installation.

I've seen bolts torqued to THE standard specification and the pressure squeezed the gasket completely out of position.  Please refer to your transformer manufacturer's instruction.

Absent that information, you want a torque value that gives good gasket compression and security.
 

old field guy

RE: Transformer cover plate bolt torque

Right. What oldfieldguy said. Its a matter of properly compressing the gasket. The bolts have most probably been selected with a tensile strength/torque margin, making the bolt max torque a bad number to use in this situation.

Absent the transformer maintenance manual, you might be able to consult with a gasket supplier to get the proper gasket pressure in PSI or Pa for the cork gasket, or better yet compression thickness. You can then calculate the required bolt torque or fractions of a thread turn beyond contact needed to achieve the requisite gasket loading.  

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