Jacketed Tank Supports Question????

[innovation2]

Hi everyone,

I am designing a jacketed tank that is shown supported by a full ring on the jacket. My design software is not supporting this type of configuration and I am wondering if it is an acceptable design. I would prefer if it were supported on the main shell. The tank measures 72"OD by 63"SW and rated at 20 psi/FV @250 F, material in 304, with the jacket being 76"OD and 60"SW and rated for 30 psi @300 F, material in 516- Gr 70. Jacket is to be full length along the sidewall only. Also, I am design in Sect. VIII Div 1 with minimal seismic and wind conditions. Any help is appreciated.

Thank you,

Jason

 

[vesselguy]

Jaybone,
Yes, I have seen and worked on the design you described. DuPont used jacketed vessels a lot in their Nylon plants that I worked on many years ago. Just because a software can't handle the design it does not mean it is not possible or it won't meet Code. Since you don't have any wind/seismic loading (it is for indoor use) and it seems like its a light weight vessel, putting the supports on the jacket might be OK provided you actually design the jacket for it. Mind you the ones I've seen places the support lugs or legs welded to the shell that's because they were heavy and operated hot.

Be careful of the bi-metallic weld at the S.S. shell to C.S.jacket joint due to differential thermal expansion between S.S. and C.S. Check with a Welding guy, but I think the C.S. jacket ring should be buttered with ER309L or Inconel and machined finished before you weld it the S.S. shell. Besure the round fillet that joint.

Check your calculations because if the vessel is heavy, you might have to put the support on the shell. You can cope the jacket around the support.

Other may know more. Just ma 2 cents.

 

[vesselguy]

Jaybone,
I just realized you said your design has a "full ring" as a support. I think you're talking about lug supports with compression rings. If so, then your vessel must be heavy. Now, I don't know what's your vessel is used for and the other design conditions, but I too would want to put the support to the shell because that 2" wide jacket closure rings would have to bear too much bending load.

Good luck.

 

[MJCronin]

jaybone,

Most of the lug supported vessels with jackets that I have seen do not extend the jacket to the top of the shell.

You can get plenty of heating if only part of the shell is covered with a jacket.

See the vertical vessel at the far right on this link:

http://www.buckeyefabricating.com/Products/Products.aspx

Specifically, what type of jacket do you require for your process ?

-MJC

 

[innovation2]

Thanks for you input.

 

[roca]

Check out the De Dietrich glass lined reactor brochure at

http://www.dedietrichddz.com/documentation.htm#Brochures

They have jacketted vessels supported by lugs, legs and rings - with lug supports welded to the jacket.

I have been involved with these vessels myself in chemical and pharmaceutical plants in the UK.