Nozzle attachment with shell/head

[lp2124]

can i provide only groove without fillet in nozzle to shell connection?
FIG. UW-16 gives attachment with fillet.
ASME SEC VIII DIV 1

 

[r6155]

NO.
Fillet welds shall be added where necessary to reduce stress concentration.

Regards

 

[IdanPV]

The minimum requirements for attachment welds at opening are provided in ASME VIII-1, UW-16.
Fittings not exceeding DN80, as shown in Figure UW-16.2 may be attached to a vessel from the outside only.
See UW-16(f)(3).

 

[lp2124]

yes r6155...In this case the fillet weld to the outside of shell is not possible due to jacket around the shell.(because the nozzle will attached after jacket setup. so we have to weld from inside of vessel shell only.)
can i provide fillet with the some inside projection?
can i use fig.uw-16 for inside projection? is it applicable?

 

[r6155]

Better is a drawing.

Regards

 

[BJI]

Since this is not a standard fitting, I believe UW-16(e) would apply up to NPS 6, which may be welded from inside or outside only.

 

[SnTMan]

As I recall, there are particular rules for nozzle reinforcement in jacketed vessels, may or may not apply to the OPs query. Apx 9 I believe.

Regards

Mike

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

 

[lp2124]

this is the case

this is standard 50DN NOZZLE..

vessel have 200 DN Nozzle too..where UW-16(e) Iis not applicable

 

[r6155]

Well, your design is ok.

Regards

 

[lp2124]

dear r6155, how do i justify that fillet weld is not required or not mandatory for fig UW-16(c) to A.I. ?

 

[BJI]

You may be able to use the below interpretation to indicate intent, since it is internal to the jacket. The fillet is not required for reinforcing and the nozzle is stayed by the jacket. The external fillet on the jacket conforms to UW-16.1.

https://cstools.asme.org/Interpretation/InterpretationDetail.cfm?TrackingNumber=8064

 

[BJI]

Probably also worth stating that UW-16.1 only provides some acceptable types of connections, it doesn't exclude other types of welded connections not explicitly listed. There is no detail provided for a shell connection through a jacket. Appendix 9, 9-6 would only refer back to U-2(g) IMO, whereby the above approach may be suitable.

 

[r6155]

See Figure UW-19.1 (e).
Fillet welding is for a smooth transition or for reinforcement. None of them are necessary in this case.

Regards

 

[DriveMeNuts]

It will be fine fot Plastic collapse failure.
However, with respect to fatigue failure???