Evaluating a lifting lug located in 2:1 head

[Morcuse]

Hello,

I'm currently evaluating a pressure vessel design.

Most relatively small pressure vessels in the refinery, usually have two lifting lugs welded directly to the 2:1 elliptical head.

If these accessories were welded to vessel shell, WRC-107 would be applicable, in order to evaluate vessel stresses due to the connection while the equipment is being moved from one place to another.

However, I fear this is not the case if the lug is located on the 2:1 head, due to it being eccentric to the vessel longitudinal axis.

I believe a commercial FEA software will be required, in order to check the vessel stresses per Div. 2. Ansys will provide the stresses combination, but these would have to be linearised. Since I have no experience with this analysis, I would very much like to avoid it. PV Elite won't let me put lifting lugs on the vessel head either. I would appreciate any input...

Another solution could be moving the lifting lugs from the vessel head to the shell. WRC-107 should suffice in this case, if I'm not wrong. Forgive my lack of experience.

Thank you

 

[racookpe1978]

What is the total PV weight, PV diameter, and what is the PV axis? Vertical or horizontal?

Only two lifting lugs? Why not 4?

 

[MJCronin]

See pages 110 -120 of this document:

http://www.networkintl.com/contents...RA0ZAMZJ/!QFPIRA0XB0FQDWGS FOR 624SR-1324.pdf

MJCronin
Sr. Process Engineer

 

[Morcuse]

Vessel design empty weight: 6097 lb
PV inside diameter: 950 mm
PV outside diameter: 980 mm
Total height: About 3584 mm
PV axis: Vertical

There are some similar vessels in the refinery, with only 2 lifting lugs attached directly to the vessel 2:1 shell, eccentric to the axis. That's why we're aiming for only two lifting lugs.

Thank you MJCronin for the link. I'll be checking it out carefully today.

 

[r6155]

See Pressure Vessel Design Manual by Dennis Moss.
FEA is unnecessary for this vessel.
Regards
r6155