WRC-107 vs. Elliptical Head

I would like to know if it is possible to evaluate a nozzle attached to an elliptical head using WCR-107 or WRC-297.

What values must I omit or change in order to get the best results?

If there is a way I could take, please let me know.

Stuart Lugo

Dear Sir,

If the nozzle is in the spherical part of the elliptical head, then it should be OK to use WRC 107 to perform the local stress analysis of the junction. You will have to enter in the spherical diameter of the head which is a function of the Aspect Ratio and diameter of the head. See ASME VIII 1 UG-37 for details on computing the spherical diameter. For a 2:1 elliptical head, the spherical diameter would be 1.8 times the head diameter. Enter in the rest of the data as you would for a typical 107 analysis.

Unfortunately, WRC 297 is not applicable for nozzle/spherical junctions. Only cylinder to cylinder intersections are allowed.


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Scott Mayeux
COADE Inc.

Follow up question.

Can anyone provide me details on how to deal with top nozzle on vertical vessels using WRC 107? The report states that the vessel and nozzle centerline should be orthogonal

Please help

Thanks!

Use PD 5500 for top nozzle on vertical vessels

Apart from referring UG-37 of Sec.VIII Div.1, there has been numerous discussions of this topic if you search this forum. Richard Ay has suggested another ingenious method for such cases where cylinder to cylinder connection is co-axial/collinear.
I believe such cases can be 'converted' into sphere to cylinder case by equivalent diameter method. In one of the codes there is infact a nice example of such problems. It is unfortunate that I really can't remember it.
PD5500 is also more or less same as EN13445, so even that can be referred.