Eccentri shell with Cone
Eccentri shell with Cone
(OP)
Hello Everyone,
Happy new year…
I come across some queries regarding Eccentric Shell Design by use of Cone.
I attached here our client requirements detail view of their product.
As we discuss with our AI, He tells us to change the design & also says that need to
Proof test of that cone with both side shell .
Please suggest me to solve this issue. We need 70mm eccentric shell . For such cone
Which part of code ( ASME SECTION 8, DIV 1) is apply.? & also suggest weld geometry .
ASME CODE: Section 8, Division 1
Design Pressure: 60 psi
Refer attachment.
Kejul Mistry
Happy new year…
I come across some queries regarding Eccentric Shell Design by use of Cone.
I attached here our client requirements detail view of their product.
As we discuss with our AI, He tells us to change the design & also says that need to
Proof test of that cone with both side shell .
Please suggest me to solve this issue. We need 70mm eccentric shell . For such cone
Which part of code ( ASME SECTION 8, DIV 1) is apply.? & also suggest weld geometry .
ASME CODE: Section 8, Division 1
Design Pressure: 60 psi
Refer attachment.
Kejul Mistry





RE: Eccentri shell with Cone
RE: Eccentri shell with Cone
Your AI, I'm sure, is aware of these rules and is not convinced they can be applied. Whatever you do, the AI will have to be satisfied.
As to weld geometry, I'd go with full penetration butt welds.
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Eccentri shell with Cone
Here AI says that as per fig ug-36 (e) angle Alpha 2 should not outside shell.
In our case , that angle is outside. So can any one suggest how to convince AI. Ot
Other option.
Kejul
RE: Eccentri shell with Cone
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Eccentri shell with Cone
By continuing this topic,
In our case , there is jacket on only top shell which have
500 shell length. Now to find external pressure limit
We take L= 750 mm (500+150+100) as per fig. UG-28.1 (a-2).
Should we take L=750mm for both top (500 mm) & bottom shell (100 mm)
for individual calculation of shell.?
Is it right or wrong?
Or suggest.
Kejul Mistry
RE: Eccentri shell with Cone
If so, you might take the jacket closeout as a line of support, giving L approximately equal to 500.
You would normally take the cone-cylinder junction as a line of support, however with your design, I don't think this is feasible.
If the entire vessel is subject to external pressure, then I suppose you could calculate each cylinder and the cone separately taking L as 750 for each. This would yield a greater required thickness for each section.
Given the proposed design, you might take it up with your AI.
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Eccentri shell with Cone
Yes, only 8 NPS pipe is covered with jacket. So should i take L= 750 or 500 for top shell?
& our design pressure is Full vacuum to 0.4 MPa.
Kejul Mistry
RE: Eccentri shell with Cone
I say approximate because location of the closeout is unknown and what serves as a line of support on the opposite end, away from the cone, is also unknown. As is most everything else in this design.
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand