Hi all,

I just started working with PVElite and I have a question about a multiple nozzle check.
Sketch:
- a diameter 1500mm klöpper type head.
- a 24" Sch. Std. nozzle in the center
- a 1.5" Sch. 40 nozzle at 353mm from the center. This nozzle is orientated 45 degrees to the outside of the vessel.

I have entered both nozzles and checked the "calculate areas for small nozzles" checkbox in the preferences section.
The Nozzle Summary however gives a diameter limit clash.

What exactly does this warning mean? I've calculated all single reinforcements according to UG-37. And according to UG-42 I should then be able to calculate the combined reinforcement.
Thanks in advance for your reply.

Corne,

You will receive this warning when diameter limits of reinforcement overlap with one another. Area in the shell cannot be counted more than once for limits that overlap.

Scott, thanks for your reply.

According to UG-42 if the area overlaps the total area of reinforcement (overlapping parts only counted once) should be equal to the two needed areas combined.
Should I read this warning that for both nozzles the maximum diameter of the reinforcing part of the shell is used and that the reinforcement is not sufficient in such a case? I'm not at work atm but if I remember correctly it doesn't say that the reinforcement doesn't suffice. Does this check use other reinforcement part diameters as the stand-alone nozzle calculations?

And does the "Nozzle Summary" normally give a combined nozzle check for all possible combinations or do I have to define this somewhere too?

Sorry for all these questions, just trying to understand the PVElite printout.

I've messed around with the input a bit and made the two nozzles Sch. 160.
Checking the Nozzle calculations both nozzles now have more than sufficient reinforcement. If I take the "total area available" minus "Area in shell" than it's still more than the "Area required".

The nozzle summary still gives the same warning:
although I don't need the shell reinforcement. If I don't need the shell for reinforcement do I still have to take into account the radii?

Corne,

In the nozzle dialog there is a box for Limits, Diameter|Thickness. You can manually reduce the diameter limits of the nozzles that conflict with each other. You can also use the 3D graphic option to show the diameter limits. Showing them may be of some help.

Scott,
thanks again for your reply.
If I understand correctly PVElite will always check if UG-42 is applicable and if it is, it will give a Y or N only for the different combinations.