Contact US

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!

*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

Lifting Lugs

Lifting Lugs

Lifting Lugs

Can anyone outline a procedure (or refer me to some literature) for the design of lifting lugs, trunnions, and re-pads for vessels?

RE: Lifting Lugs

Several books will have this information.  Check any of the following:  

Pressure Vessel Handbook, Megessey (sp?)
Pressure Vessel Design Manual, Dennis Moss
Process Equipment Design, Brownell & Young

RE: Lifting Lugs

You have to consider all the available shear paths on the lugs.

How do you intend to lift the vessel?  If your chains act an angle this will increase the load on the lug.  Check out my site for information on fillet weld design www.gowelding.com

Another point to bear in mind is the effect of the localised load on the vessel; it may be prudent if the vessel is large to perform local load calcs using WRC 107 try www.xcalcs.com

Don’t forget to consider jerk loads.

RE: Lifting Lugs

The lifting lug design are on the references kstaylor mention, some basics:

-First define a shape and location you find pratical to use on the field. Sometimes the location can lead to unnecesary scratches or paint damage that can be prevented with a propper location. In general nozzles and anchor devices can work fine as lifting lugs, so if they are adecuate people will use them sometimes.

Your design won´t look good if you have designed lugs and in the field people preffer to use other atachments wich are more useful.  

-Make the calculations for the lug and the weld.
In general calculations suppose you put all the weight in a single lug. Some calculations vary on the critical angle of the rope.

-Pads are for reducing stresses. Also consider using pads in order to protect the vessel from big welds (you reduce the risk of damaging the thickness of the vessel with the lug welding procedure) in case it is important (small thickness vessel, unknown welder, etc).

-Perform a WRC107 or similar stress analisys on vessel wall if necessary.

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! Already a Member? Login


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close