i want to design for vertical vessel having weight of 94 tonn.
vessel is having nozzle on the head(25 nozzle).

lifting lug is so that i can lift it vertically and tilt it to transport from fab shop to site.

how i can design with the help of PV Elite?and
how i can decide which type of lifting lug is good for my vessel?

Dear Viju,

At this time, you have to go to CodeCalc (component analysis part of PV Elite) to analyze the lifting lugs. You will have to use the Legs and Lugs module in CodeCalc. You will have to specify the lifting loads in the program.

In the Examples sub-directory under PV Elite installation folder there is a files lugs.cci that includes some examples.

I would also suggest you to perform a local stress analysis using the WRC-107 module.

You may look at this related post,

http://www.coade.com/ubbthreads/ubbthrea...=true#Post20106

Thanks for reply Mandeep,

In our vessle we are using re pad in between lifting lug(vertical type) and vessel.

how i can check or design re pad dimension and welding dimension for same.
kindly give brief discription if it is not there in PV Elite.

i show few vessle which are there in our running plant that they have repad of 30 mm thick if lug of 50 mm thickness.Is it ok to have less thicker re pad than lifting lug?

You should check the local stress at the lifting lug using the WRC-107 and consider the re-pad.

I am not too sure about your question about the re-pad thickness. May be someone with more experience can answer it.

I will tell you that for a nozzle on a shell it is advisable to not have re-pad thicker than the shell. As this would create high stress concentration which could be a hot spot for fatigue failure.

Viju,

A simple way of calculating the pad thickness is given in the Geman Codes DIN 28085 (lifting lugs) and 28086 (eyelets).

As you want to use the lugs for horizontal and vertical lifting, DIN 28085 will be the better choice. It even gives some advice on the selction of the lifting lug sizes.

The pad thickness is limited to 1.5 times shell thickness as fatigue usually is not to be considered for the transport load case.

Regards

Vessure Pressel

Thanks for your help Mr Mandeep and vessure.