Nozzles added over another nozzle

[TheEverest]

Dear all,

What are the code sections that are to be referred to in order to add Nozzles on top of another nozzle ?

 

[IFRs]

If you are putting a new nozzle in the tank shell some distance vertically above an existing nozzle follow the reinforcement, weld spacing and thermal stress relief requirements in API 650 and API 653.

 

[mk3223]

Could you clarify what's the nozzles on top of another nozzle and what's the equipment for?

 

[TheEverest]

The top one is dip-tube and is used for inlet of acid.

 

[LittleInch]

Please add a drawing or a sketch as this doesn't make sense

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[IFRs]

Does it direct acid into the nozzle or the tank shell?
If into the nozzle, I'd use an O-Let in the nozzle neck, centered between welds on the neck and limited in size depending on the nozzle size.

 

[TheEverest]

IFRs, The dip tube directs the acid into the tank shell. I prefer using a blind over the nozzle's flange and above this blind, create a hole for insertion of the dip tube's nozzle neck, but for this purpose, what shall be the requirements to be fulfilled as per API 650?

 

[LittleInch]

DRAWING

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[IFRs]

You'll need a competent engineer familiar with tanks and the design standards as well as the requirements of the jursitiction (city state, province, country, etc).
First - is the tank designed pern API 650, API 620, ASME or some other standard?

The API 650 requirements will include weld details and NDE; dimensions and material requiremens of the neck, flange, repad, insert; reinforcing of the hole; weld spacing to adjacent appurtenances and welds; NDE, thermal stress relief.

For AI 650, in general you'll need to know the design standard and at least the following:
tank diameter and height
tank shell thickness and grade
design sepcific gravity
design corrosion allowance
design metal temperature (high and low)
size of the new nozzle
location of the new nozzle relative to the existing nozzle
details of the existing mozzle (neck material, grade and thickness, inside projection, outside projection, elevation, repad material grade, size and thickness, orientation if not radial, all weld details

I'm sure I've missed something(s).