ASME S8D1 Figure 2-4 - what applicable weld scheme?

[22west]

Hi,

I am performing a S8D1 flange calc on an existing PV cover (flange + torispherical head). I am trying to establish the most applicable flange -to-head weld scheme from Figure 2-4 - I think it is sketch (11), full pen with backchip. I attach an image of the flange weld detail from the original fab drawing. Does anyone see a more applicable figure 2-4 weld representation to assume for this calc? This flange was registered in 1959 along with a storage tank under S8D1 but the overall CRN package does not have any calcs for this cover.

Thanks,
22west

 

[gtaw]

I can see the single bevel groove on the ID of the dished head, but I don't see the bevel groove with reinforcing fillet on the OD of the dished head.


Best regards - Al

 

[SnTMan]

22west, I'd think Sketch 11 is applicable, and that the detail meets the requirement for an integral flange.

Could kind of depend on the particular shop practice, but the weld symbol shown on the left (outside) of the joint could be interpreted to show a back-gouge that extends to a previously made inside groove weld. Followed by a groove weld, so full-penetration, and a really large fillet

Regards,

Mike

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

 

[Geoff13]

I'd agree with SnTMan that the weld symbols meet Figure 11.

Unless you have a really long straight flange on that head it would seem you'll be a Figure 1-6 Loose Type flange. The integral flange would require about 5" of straight flange (if I added up the dimensions correctly).

Good luck on your checking.
Geoff

 

[gtaw]

Wow, we're all going to die.

Best regards - Al

 

[22west]

Hi all,
I did not get these responses until now because I was monitoring my emails and not the website. It seems my "reply alert" is not working.
A note of thanks for the helpful responses. Not sure about the reason for the "all going to die" comment. . .

Cheers,
22west
.

 

[gtaw]

The welding symbol on the OD is calling for a complete joint penetration bevel groove weld. The depth of the bevel is 1 1/4-inches, the dished head only extends into the joint an
1 1/8-inch in the area to be welded. That being the case, the bevel on the OD leaves nothing to back up the CJP bevel groove on the ID. You are going to be welding on air.
This is the joint preparation based on the dimensions I could see. Is this what you want?
Best regards - Al

 

[gtaw]

Let me try to download the sketch again. This is drawn to scale by the way.

Al

Best regards - Al