Dear Moderator,

There is an option in the lifting lugs dialog box called "group of lugs" in which we can add 4 lifting lugs to the vesselby selecting the option '2' in the group of lugs tab.(conventional way is to add 2 nos for horizontal vessel by selecting '1' in the group of lugs tab).

But if i add 2 how would i know the distance between the adjacent lugs?

Also how would the tangential forces act in this case?

What would the orientation be for these lugs?

Please advise.Earneslty looking for your reply

Moderators please reply!!!!!

Dear Riyazudeen,

"But if i add 2 how would i know the distance between the adjacent lugs?"

Answer: There is a dialog box " Lug distance from left end" Please enter distances of both locations of lugs from left end only.

Now if you chose option '2' in the group of lugs tab , there will be 2 lifting lugs at one end and 2 at the other end. PVElite assumes the use of spreader bar.

Now consider left end lifting lugs. If you mention 90 deg angle of there will be only normal force acting on the lug.

PVELite doesnt consider the angular location of the lifting lugs

Also at left end , the 2 lifting lugs seems to be separate along longitudinal axis if you mention 45 deg sling angle to horizontal since there is no tangential force only normal and axial force. the distance berween the 2 lugs at left end is also not clear.

Moderators : Additional help is required.

Regards
ASD23789

Dear ASD23789,

The whole point here is to avoid the spreader beam bar and to provide single point lift with four numbers lifting lug.

So what u are trying to say is that 4 nos lifting lug can only be provided for Spreader beam lift?

" So what u are trying to say is that 4 nos lifting lug can only be provided for Spreader beam lift? "

No Riyazudeen that is not what i tried to convey in my earlier post.

You can have a single point lifting posiible

For Force resolution, refer 3d Forces in Applied mechanics.

Hope this helps.
Regards
ASD23789

hi all,


will anybody tell me please what referance has been used for the design of lifting lug ??? actually i want to perform manual calculation, the way PVElite/Codcal is doing, hence want to refer it.


Thanks in advance.