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Participant

Join Date: May 2013
Posts: 3

Diameter of Skirt for Hemispherical Head

05/10/2013 12:47 AM

Dears

Can somebody tell me is there any standard to decide diameter of skirt support where the type of head is Hemisperical one??

Also please tell me when Y-ring option is selected instead of skirt welded directly to hemispherical head??

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Pathfinder Tags: Hemispherical Head
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Guru
Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

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#1

Re: Daimeter of Skirt for hemispherical head

05/10/2013 3:42 AM

I don't think there is a standard for this; you may design it at your own option, so long as it meets strength requirements.

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Participant

Join Date: May 2013
Posts: 3
#3
In reply to #1

Re: Daimeter of Skirt for hemispherical head

05/10/2013 4:17 AM

Thanks!!. However In my opinion mean diameter of hemispherical head shoud match with mean dia of skirt support if there is a sufficient clear gap between butt weld joint of shell to head and skirt support to head.Correct me if I am wrong.

Your reply that "there is no standard applicable" is valid also for selection of forged Y-ring?? OR Y-ring should be selected in certain cases like creep temp. range etc.

And if one decide to go for Y-ring then how to decide the dimensions of this Y-ring??

Is there any standard of any PMC available?? OR is there any standard procedure to dimention Y-ring??

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#2

Re: Daimeter of Skirt for hemispherical head

05/10/2013 4:07 AM
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Guru
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#5
In reply to #2

Re: Daimeter of Skirt for hemispherical head

05/12/2013 7:51 PM

I have seen vessel skirts anywhere from o.d. = shell o.d. down to stanchions of pipe. I think you are right to mention the distance between head-to-shell and head-to-skirt joints.

I am not familiar with the Y-ring terminology, and again I don't know of any standards for it. However, seismic considerations (e.g., overturning moment) may apply.

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Join Date: Dec 2010
Location: Australia
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#4

Re: Diameter of Skirt for Hemispherical Head

05/12/2013 6:48 PM

Most times the skirt goes around the waist .. or the ankles if you're really lucky..not the Hemishperical head...

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