Studded Flange

[401laurent]

Hello,

On the Bottom of ASME 2:1 Elliptical Head, I have to design a 12.6" ODX 8.66" ID X 0.7" thk Studded flange with 8 x7/16" dia. whole holes ( none threded hole)in order to install a Europpeen Agitator.
The tank is designed as per ASME Section VIII div.1.
I'm using Compress Programe for the design calculation, but with this programe, unfortunatly I can't calculate this flange, I try also to see on the Appendix 2, but there is no studded flange Formulas on this Appendix.
I think that I have no other choise to do a FEA ( Finite element analysis)as a calculations for the Authorised Inspector.
Could some one give me other issues for this case.
Thanks.
Laurent.

 

[vesselfab]

How are you going to Hydrotest this opening with no threads to bolt down a cover.

to get reinforcement calcs, just put it in as a hollow forging.

The flange itself, i have no idea.

If there is no pressure, why stamp it?

 

[SnTMan]

401laurent, maybe you could provide a sketch or something. I'll bet nobody can say with any certainty what a "Studded flange with 8 x7/16" dia. whole holes ( none threded hole)" is, particularily after your refer to "studded flange" later in your post.

Is this a flange as shown in Appendix 2, any of the various figures? Is it a studding outlet as shown in Fig UW-16.3? Something else altogether?

BTW, I don't believe Appendix 2 takes any account of the presence or absence of bolt holes, therefore I think it could be used to design a flange with tapped holes, blind or not, or through holes either one.

Regards,

Mike

 

[401laurent]

Hi Mike(SnTMan),
Please find attched sketch to see the studded flange.

 

[401laurent]

other sketch of this studded flange.
see attached file.
Thanks.
Laurent.

 

[vesselfab]

It looks as though there is a short neck on the flange tank plate.

should be long enough to get the bolts in from the bottom (as drawing) between head and flange. You will have to ask how long it is.

the neck for reinforcement will have to be done as a hollow forging. get dimensions from manufacturer.

the flange facing/bolts will have to be done by appendix 2 or by manufacturer.

 

[SnTMan]

401laurent, OK, assuming you want to design your own, either case in your first sketch, I think I would design first, as a loose ring flange, Apendix 2, Fig (4b). Studded or thru holes, doesn't matter.

Second, design opening in the head per UG-37, treating the flange material not including the bolt holes as reinforcement.

You will need extra material not considered in the first step to consider as available for reinforcement, see UG-40(e).

This would be a "quick and dirty", but conservative way to go about it.

Regards,

Mike

 

[unclesyd]

Go to this site and look at the vessel connections especially the "Studding Outlet" which are called out and listed by Class. Then look at a call out for Insert Lip " type Q".
In the ones we have used the lip hasn't changed the flange rating as there are numerous weld details allowed for installation by Code.
You will find the Studding Outlet in the ASME Codes without the Insert lip.

http://www.forgedcomponents.com/

Good luck with bottom entering mixer.