Member Login

Remember Me
Forgot Password?
Join Us!

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!

Join Eng-Tips
*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.

Link To This Forum!

Partner Button
Add Stickiness To Your Site By Linking To This Professionally Managed Technical Forum.
Just copy and paste the
code below into your site.

Checking Lifting Lug Calcs

Checking Lifting Lug Calcs

I am trying to check some lifting lug calcs using Pressure Vessel Design Manual (by Moss) mainly. I have come across some conflicting methods / conventions when compared to other literature. The scenario is:

standard plate-type lifting lug with gusset, checking the lug-to-pad weld when lifting the vessel from the horizontal position using a spreader so that no (or neglible) bending occurs parallel to the lug.

Lest I am mistaken, there is a direct shear acting (= F/A), and longitudinal & transverse shear due to the moment. Generally, I have seen the moment arm being taken as the distance between point of lifting and the c.g. of the weld. Is this a conservative calc. since we are essentially neglecting the gusset support? Can someone breakdown the mechanics of this?

RE: Checking Lifting Lug Calcs

julesomar (Mechanical)

Two example is listed on go to the Photo Gallery END   "LIFTING LUG ANALYSIS"

Leonard Stephen Thill


RE: Checking Lifting Lug Calcs

Be carefull with the earlier editions of the Pressure Vessel Design Manual (by Moss) - it was littered with errors - I think this has been mentioned in previous posts in the past. Not sure what the latest edition (3rd...?) is like as I don't have a copy of it

RE: Checking Lifting Lug Calcs

Thanks for the initial feedback. Roca, I have heard the Moss text has some errors. Again though, I am interested in the fundemental mechanics / assumptions at play - does the presence of the gusset / support plate connecting the shell to the lug mean that the calculations presented in Moss / other handbooks are simplified?

Lsthill, in your analysis, the moment arm distance is taken from the centre of the pinhole to the base of the lug. How does having a support plate welded to the lug (say halfway down) affect the resulting shear?

RE: Checking Lifting Lug Calcs

julesomar (Mechanical)

What type of Lifting lug are design:

Pressure Vessel Desing Manual
Third Edition
Dennis Moss, fluor, california, USA:
Pressure vessel design manual: illustrated procedure for sloving major pressure vessel design problems:

Chapter 7
Transportation and Erection of Pressure Vessels, 365
Procedure 7-1 transportation of Pressure Vessel365
Procedure 7-2 Erection of Pressure Vessel 387  
Procedure 7-3 Lifting Attachment and Terminology 391
Procedure 7-4 Lifting Loads and Forces, 400
Procedure 7-5 Design of Tail Beams, Lugs, and Base Ring Details, 406
Procedure 7-6 Deaign of Top Head and Cone Lifting Lugs, 416
Procedure 7-7 Design of Flange Luge, 420
Procedure 7-8 Desing of Trunnions, 431
Procedure 7-9 Local Loads in shell Due to Erectin Forces, 434
Procedure 7-10 Miscellaneour 437

If using any pressure vessel application software like CODEWARE COMPRESS, PVelite has detail claculation for the Procedure.

Leonard Stephen Thill


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!


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