Minimum Nozzle Projection Requirement Per ASME VIII Div.1 ? 1

[billbusy]

As I remembered there are some Minimum Nozzle Projection Requirement for Tanks Per API 650.

But I don't find any Minimum Nozzle Projection Requirement in ASME VIII Div.1.

Can anyone tell me a little bit more about that? Thanks.



MSc. Mechanical Engineering;
5 years EPC experience;
Oil & Gas industry in Canada.

 

[EngAddict]

Just whatever is functional for removing studs, considering any insulation if applicable. Check the client specification, if they don't list anything then probably go with some standard offsets from the PV books.

 

[gr2vessels]

The pressure vessel code is not specifying the minimum projection, but there are other considerations to define the minimum height of a nozzle (I assume you are considering the flanged nozzles with a nozzle neck).
If using stud bolts, you need to be able to remove the stud bolt from behind the flange, hence the minimum height will include the length of the stud plus a small margin. In addition, you need to include the thickness of insulation, if applicable. Also, some nozzles need to protrude through the platform grating, hence additional height.
Cheers,
gr2vessels

 

[SnTMan]

You might also consult UG-40.

Regards,

Mike