Help on tubesheet to shell weld for a S&T heat exchanger

[claudiotomasoni]

Good morning everybody.

I need some help on the topic in the object.
I have a heat exchanger with steam/water tube side, and a non-corrosive liquid/vapour shell side.
The HE is also subject to fatigue.

We usually ask for welds to be done as in UW-13.2 (d), but for similar applications we have done UW-13.3 (a) steam/water side in the past.

Considering EN 13445, I would say the UW-13.2 (d) is a joggle joint (not sure, is it?). Therefore it cannot be used with water/steam as per EN 13445-3 para. 5.7.4.1.
I don't see any limitation within ASME VIII div. 1, so I figure out I can freely choose either one or the other.

Am I right, or is there something I am missing?

Thanks in advance.
Claudio

 

[SnTMan]

claudiotomasoni, assuming you are under Sec VIII, Div 1, I'd say it is your option. I'd add it is always good practice to avoid a crevice at the tubesheet-cylinder joint if possible.

And for fatigue a full penetration detail is preferred.

Regards,

Mike

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

 

[r6155]

Both UW 13.2(d) and UW-13.3(a) are full penetration welds.
Besides, UW 13.3 (a) is butt-weld and can be radiographed.
Regards
r6155