ASME BPVC Sec. VIII Div. 1 UG-36(C)(3)(-C)

[TylerM]

Hello All,

My question is if you have two small nozzles (let’s just say the finished diameter is 2”) in a pressure vessel with a thin shell thickness (let’s say 0.25”) and they are relatively close together. Do you need do preform a calculation to determine if their centers are further away from each other by at least the sum of their diameters?

To restate, if you have nozzles that meets UG-36(C)(3)(-a)(-1) and are exempt from reinforcement calculations, do you still need to do center distance calculations per UG-36(C)(3)(-C)? or are they exempt from those as well?

As always thank you for your input,
Tyler

 

[SnTMan]

TylerM, are (-c) & (-d) not "following conditions" to UG-36(c)(3)?

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[TylerM]

@SnTMan

So as per UG-36(c)(3) all conditions (-a), (-b), (-c), and (-d) must be met [If they apply] to exclude that opening from a reinforcement calculation?

In my example above I can exclude UG-36(c)(3)(-b,-d) because it's not a threaded, studded, or expanded connection nor more than two openings. But I have to meet requirements UG-36(c)(3)(-a,-c) because it is welded and there is two openings close to each other. Is this correct?

 

[SnTMan]

Yes, don't make it harder that it is

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[GenB]

if you stagger the fittings you have to prove reinforcing.

General Blr. CA,USA