Design of body flange with hole

[GD_P]

We have shell with body flanges on both ends and jacketed on full length of shell, welded to body flanges.
The shell is vertical.
Is it possible to design body flange with hole?
Where does ASME VIII div I address design of such loose flanges with holes?
FEA could be one option, but is it possible to perform them manually?
Please share your opinion.

GD_P

 

[TGS4]

You'll need to share a picture/drawing, because I don't understand what "with a hole" means.

 

[SnTMan]

GD_P, not sure what you have in mind exactly, but body flanges are often drilled radially with a smallish hole for a vent / drain. They are often drilled axially for jackscrews. These drillings are generally not accounted for in design of the flange.

Also note that under APX 2, the presence of the flange bolt holes themselves are not accounted for.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[GD_P]

Imagine there are 2 concentric cylinders with small radial gap in between to them, inner cylinder is called shell & outer is jacket. Both cylinders are welded to loose flanges designed as per MAN APP 2.
Flanges are drilled with radial hole upto half width of flange and vertical connecting the previous hole to jacket drain.
Purpose of radial hole is drain hole for jacket fluid.
Hope it is clear now.

GD_P

 

[SnTMan]

If the holes are not particularly large, I see no problem.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[mk3223]

It sounds like the radial hole on the jacket flange is similar to the small taps on the Orifice flange. Is it correct?

Or, just a thought to have the drain connection drilled in the jacket pipe section instead of on the jacket flange to simplify the fabrication.

 

[TGS4]

I'm with SnTMan - I don't see a problem.

 

[r6155]

See UG-99(i) Vents shall be provided at all high points of the vessel in the position in which it is to be tested to purge possible air pockets while the vessel is filling.

Be careful. You need a hole in each flange (drain and vent). If the hydraulic test is with the vessel in horizontal position you need a vent in the jacket. The hole in the flange is not enough.

Regards
r6155

 

[GD_P]

The holes are only 6 mm in dia.,
But is there any clause or interpretation to justify its acceptance without calculations.

For hydro of the vessel in horizontal position, one nozzle is kept vertical with vent.

GD_P

 

[SnTMan]

I know of nothing in writing.

The problem with sloppy work is that the supply FAR EXCEEDS the demand