ElCidCampeador
Mechanical
- May 14, 2015
- 274
Construction code: ASME VIII Div.I
Good day,
I've a small stainless steel pressure vessel (O.D. 300mm, Length 500mm) with 2 formed torispeherical heads at both end, pressure design 40 bar, T.design 320°C
On this vessel we find some some nozzles, in particular one which is a protruding nozzle (made from forging), O.D.30mm with 1 side 1/2" NPT threaded, total length 50mm, interior projection about 20mm, welded to the head.
This nozzle is not a B16.11 fitting or belonging to other standard and it's welded with an outside fillet weld and a partial penetration weld through the thickness. No fillet weld on the inside.
I'm trying to understand if this kind of weld is accepted by ASME code.
If you look at ASME VIII Div.1, figure UW-16.1 (l), my nozzle it's very similar but with 2 important differences:
1) Inside weld is absent
2) The partial penetration thickness starts from the outside surface and stops I think at 3/4 of total thickness of head
Is it acceptable? There is another image, figure UW-16.2 K, which I could use to justify it, but this figure refers to par. UW-16(f) about "standard ASME/ANSI" fitting, which is not this case.
Thank you
N.B: nozzle is not exempted acc. to UG-36(c)(3) by client request
Good day,
I've a small stainless steel pressure vessel (O.D. 300mm, Length 500mm) with 2 formed torispeherical heads at both end, pressure design 40 bar, T.design 320°C
On this vessel we find some some nozzles, in particular one which is a protruding nozzle (made from forging), O.D.30mm with 1 side 1/2" NPT threaded, total length 50mm, interior projection about 20mm, welded to the head.
This nozzle is not a B16.11 fitting or belonging to other standard and it's welded with an outside fillet weld and a partial penetration weld through the thickness. No fillet weld on the inside.
I'm trying to understand if this kind of weld is accepted by ASME code.
If you look at ASME VIII Div.1, figure UW-16.1 (l), my nozzle it's very similar but with 2 important differences:
1) Inside weld is absent
2) The partial penetration thickness starts from the outside surface and stops I think at 3/4 of total thickness of head
Is it acceptable? There is another image, figure UW-16.2 K, which I could use to justify it, but this figure refers to par. UW-16(f) about "standard ASME/ANSI" fitting, which is not this case.
Thank you
N.B: nozzle is not exempted acc. to UG-36(c)(3) by client request
