Nozzle location on Horizontal vessel 3

[FizzyJelly]

Hi,

Does anyone know if there is a limit to how far below the CL you can locate a nozzle on the shell of a horizontal vessel?

I have been given some 'best practice' advice about putting something no further than 50o from the CL but would prefer to take it to 60o-65o.

The vessel shell is 1'' thk with an OD 24 (made from CS plate not pipe)and the nozzle to be added could either be 3/4'' threaded pipe or a 3/4'' elbowlet depending on the angle.

I hope the above makes sense!

Any advice would be very welcome.

Cheers

 

[europipe]

Just good design practice,

You can reinforce the nozzle with strips.
Why do you want such a small nozzle and such a large standout?
I should say; make a 2" nozzle and let piping reduce the connecting line or to instr.

 

[racookpe1978]

Draw your problem.

I regret I cannot "translate" your reference to "I have been given some 'best practice' advice about putting something no further than 50o from the CL but would prefer to take it to 60o-65o."

 

[SnTMan]

FizzyJelly, nozzles can be placed off the CL so that they are tangent to the cyl. They just must meet reinforcing requirements of the Code of construction.

Regards,

Mike

 

[JakeR82]

A good example of the reinforcement needed for off center line is in ASME appendix L, example 7.7. You have two planes you will need to analyze.

 

[DavidCR]

If you can define the MAWP by code rules like ASME Div I or Div II, you can place it anywhere.

If you are using the "classic" rules of reinforcement of Div. 1 or the classic rules of WRC107/297, or similar, there are limits of placement and orientation, related to the scope of the provided formulas.

 

[TD2K]

There's no real limit that I'm aware of, it's just a matter of fabrication issues.

Typically, I try to stay within 80% of the vessel diameter when locating nozzles on heads or the sides of horizontal vessels. As you get outside of this range, the intersection of the nozzle with the head/shell starts getting larger and larger.

We had a 12 foot ID horizontal flare drum that the client wanted level connections coming off the shell horizontally. They didn't want them located vertically at the bottom because of plugging problems. We ended up locating the centerline of the 3" nozzles 6" above the bottom ID.