Lifting Lugs/Trunnions on Jacketed Pressure Vessel

[waskillywabbit]

Never had an occasion to think about it before, but one has presented itself where the lifting lugs, probably trunnions due to a bolted connection top (vertical vessel), will have to be placed on the jacketed portion of a vessel. It is only jacketed at the top and goes too far down to make useful lugs any lower practical/useful on the vessel.

Should the trunnions go through the jacket and attach to the shell or simply the jacket only? Never seen anything in the code specifically about this, but I have not diligently searched yet, and I have never seen a rule of thumb or suggested practice.

Thanks for your input.

Brian

 

[bhushan76]

First paragraph of your query is not very clear.
What I understand is you want to know whether lifting lug can be attached to jacket ?
As far as i know the answer is NO. Lifting lugs are to be attached to the shell directly. If sufficeint place is not available , some kind of arrangement has to be worked out e.g welding plate to a shell and attaching the lug to the plate in turn.

 

[prex]

IMHO there is nothing against welding the trunnion to the jacket, provided of course there is sufficient thickness, that you can check with a WRC297 like calculation.
Going through the jacket could cause differential expansion problems, depending on your process conditions.
If the jacket is thin, an alternative to consider is making it thicker at least locally, but the best solution depends also on the proportions of your vessel.

prex

http://www.xcalcs.com

Online tools for structural design

 

[MJCronin]

waskilly...

Most jackets I have seen have been on small vertical axis processvessels.

On these vessels, lifting lugs are located on the heads only.

Where a horizontal vessel has a jacket, the jacket stops at the top centerline of the vessel. this is where th lugs are located.

"Central Fabricating" of Cincinatti, OH has done a lot of jacketed vessels.....visit thier website..... i would ask them this question