NOZZLE

How do i attach an axial nozzle to bottom of conical head??

(Should i consider the nozzle as a shell and design it?)

Rachana,

Since the nozzle is attached to the end of the cone, no hole is being cut in the cone. So, nozzle area replacement check is not required.

On the other hand, local stress is developed at the junction of this axial nozzle and the cone, due to change in curvature. This will be checked when you model a cylinder attached to the cone per App.1-5 and 1-8.

So, in my opinion you can model the nozzle as a shell attached to the cone.

Hello rhv

Normally, the programme expects cylinders to attached to either end of a cone. This is because PVElite performs the cone analysis in accordance with Appendix 1-5 for internal pressure and Appendix 1-8 (ASME) for external pressure. However, you cannot directly install a nozzle in the end of a cone, but you can do the following to achieve the same result (assuminng you have a vertical vessel with a skirt support).

Remember, PVElite constructs the vessel from the bottom to the top.

1 start your model with the bottom nozzle, which is entered as a cylindrical shell. set the dimensions of this nozzle (shell) to the normal pipe size of your choice.

2 if there is a flange at the bottom of this nozzle, then add it by inserting is before the cylinder, and set its dimensions, or use the look up feature.

3 next, add the cone. At this point, you will have (if you look at the model on the screen), a cone with a flanged nozzle at the bottom (the nozzle actually being a cylinder component).

4 now add the skirt, and ensure its top and bottom dimensions are set to the correct diameters and that the skirt length is correct.

5 continue building the remainder of the vessel.

I know this seems somewhat long winded, but this method will achieve the result you want.

If you have a problem, you can alway 'phone me at 281-890-4566, and I can go through it with you.