Opening in CONE 2

[vinstein]

Hi,

This is regarding the opening in the lower half of the cone, my cone dimensions are as follows.

Larger ID : 2901 mm
Smaller ID : 97.2 mm
Thickness of Cone : 19 mm
Overall length : 1400 mm

Now we have to do the WRC calculation of the nozzle which is attached on the lower opening.
As per my understanding there is no provision in ASME Sec VIII Div.2 or Div. 2 for such kind of opening.
So what we have done is, in COMPRESS we have attached a Forged shell on the lower half of the cone and then we have attached the nozzle pipe to the forged shell.

We have to avoid Part 5 analysis. Can anyone suggest some views ..?

 

[prex]

Can you better specify your geometry? Is the nozzle you speak about the nozzle on the smaller ID of the cone?

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[vinstein]

Yes the nozzle is on the smaller ID of the cone.

 

[TGS4]

The end-effects of the cone (specifically the cone-to-cylinder junction) preclude the use of WRC-107 in this instance. Sqrt(R*t) of your cone - based on the large diameter - is 166mm. To avoid interaction from end-effects, you would want to be at least 5*sqrt(R*t), or 830mm away. But, that takes you to more than half-way up your cone...

You're stuck here - if this is a Div. 1 vessel, then U-2(g). Do the Div. 2, Part 5 analysis.

 

[prex]

You can't use WRC 107 for a cone end. However the stresses coming from moments and forces on the end of the cone may be easily calculated, it's not much different from doing that for a pipe with end moments.
Once you have the stresses you would combine and use them just the same way you would have done with WRC 107.
Not also that it shouldn't be difficult to demonstrate that, when those stresses are acceptable for the nozzle neck at the smaller end, they must also be acceptable in the cone, as the diameter and thickness go increasing.
Of course this assumes you are not required to estimate the secondary (discontinuity) stresses at the pipe to cone junction. I don't think those may be evaluated without FEM for external moments. However secondary stresses need not be considered under Div.1, but of course you'll need to get an agreement with the person approving your calculations on this point.


prex

http://www.xcalcs.com

: Online engineering calculations

http://www.megamag.it

: Magnetic brakes and launchers for fun rides

http://www.levitans.com

: Air bearing pads