Bearing (Hertzian) stresses and Tension stresses in lifting lug design 1

[fizzy]

Hi All,

Please i'm designing some lifting lugs on a horizontal pressure vessel and would need advice on calculating for the bearing (Hertzian) stresses and tension stresses.

 

[MotorVib]

If you are welding the lugs on I would take a look at Design of Weldments by Blodgett. It is an old book but I have never found anything close to it out there.

Also take a look at the angle of the chain. Try to keep your chains all the same length and try not to put a side moment the lug.

Also look at the standers SF for lifting in the country that it is going in to.

Chris

 

[metengr]

You might find this information useful;

http://www.pdhonline.org/courses/s106/s106.pdf

 

[JStephen]

Normally, you wouldn't calculate a contact stress as might be done with ball bearings- you just work with the average stress in the area and assume there will be some local yielding. See some of the pressure vessel handbooks for typical details. Also, there's a paper available on lifting beam design that includes an analysis of the lifting eyes.

 

[LSThill]

Trunnion design...Your Suggestions?
thread1259-184855


Tom Barsh

design of lifting and tailing lugsNetsc001.pdf

Leonard Stehen Thill
•

http://files.engineering.com/getfile.aspx?folder=05e1d89c-ec31-412d-847d-e8

Did you Take the SOUTH TEXAS SECTIN OF ASME PRESSURE VESSEL ENGINEERING SEMINAR 1998:

SESSIN 1 Interduction and Desing Philosophy Pressure Vessel Code, Section VIII, Div 1, 2, and 3 by James R. Farr, PE Pressur Vessel Consultant, Wadsworth, Ohio.

Section 2 Pressure Vessel Design per ASME Code; Desing of Support and Lifting and Tailing Lugs Gerry Gravin, P.E. Bechtel Corporatin Houston, Texas.

Section P. Design of Lifting and Tailing Lugs Page 208.

The above was given to LES in 2004 for the project requirements.

Also, is LIFTING_LUG_&_TAILING_LUG_CALCCULATION.pdf
This was given to Les in 2004 for the project requirements.

Tom, I hope this will be included in CODEWARE COMPRESS TO NEET THE CLIENT REQUIREMENTS and CODEWARE COMPRESS USERS.

Regards

Leonard Stephen Thill

TWGreene (Mechanical)
1 May 08 11:12
I do not have experience in pressure vessel design, but I am involved in the heavy lifting industry. In my experience, the "fixed plate" trunnions with the non-rotating teardrop plate are mainly for flare stacks and other tall columns.

From a lifting standpoint, the benefit over rotating plates is that they do not need to be lubricated before the lift. This is especially important for removal of old equipment because the trunnion may be hundreds of feet above the ground where re-lubricating a seized plate presents additional difficulty.