ASME VIII-1 welding for internal projection nozzle on standard blind flange 3

[FPPE]

Hi,

I have a question about the calculation in accordance with ASME VIII-1 for the configuration shown below:



what are the reference paragraphs for the calculation of the standard blind flange with a 4" nozzle inserted as shown in the detail? Being a standard component but modified due to the presence of a hole, it needs to be verified in accordance with the code. Could it be calculated as a slip-on, considering the 4" pipe as if it were the shell of the flange?

Thanks in advance

 

[IdanPV]

"Question 3: An ASME B16.5 reducing flange requiring a hub has an axial hole in the center that exceeds the size limits in UG-36(c)(3). Is it acceptable for Section VIII, Division 1 construction to use the ASME B16.5 pressure-temperature ratings for this flange without performing the reinforcement calculation per UG-39?

Reply 3: Yes"

I understand that in my case (12" blind with a 4" nozzle), I could use (referring to Table 6 of ASME B16.5) a reducing flange with the dimensions of a 12" blind, plus the hub of a 4" WN welded to above pipe. Considering that the 4" pipe has a thickness of 13.49 mm, the internal diameter of the blind would be (114.3 - 2*13.49) 87.32 mm.

In this case, no calculation would be required according to ASME VIII-1, and we can simply follow the pressure-temperature rating of B16.5.
Is my interpretation correct?

I think that your interpretation is correct.
I suggest you to ask your A.I.
Note that some provinces and jurisdiction sometimes don't accept the use of Interpretations.

As for the weld design - I think the UW-16.1(i) or (l) might be suitable for you case, pay attention to the symbols and notes.

 

[FPPE]

Hi RadiateurFou,

The image is a screenshot of the existing equipment drawing not designed by us.
We now need to redesign it completely.

 

[FPPE]

I think that your interpretation is correct.
I suggest you to ask your A.I.
Note that some provinces and jurisdiction sometimes don't accept the use of Interpretations.

As for the weld design - I think the UW-16.1(i) or (l) might be suitable for you case, pay attention to the symbols and notes.

Thank you very much IdanPV!

 

[XL83NL]

@FPPE,
I've found some old threads from this forum that might help you:

Openings on Blind Flanges (Bolted Covers) - Boiler and Pressure Vessel engineering

I'm working on a vessel that will have a 6" Class 600 (1000 psi @ 400F) Blind Flange on a nozzle that requires a Centered Opening (1 1/2" NOM) and (6) 1/2" NPT Tapped Holes surrounding this center opening (Image attached). I've read ASME B16.5 Table 6 and the 1 1/2" Centered Opening complies...

www.eng-tips.com

Openings in blind flanges - Boiler and Pressure Vessel engineering

I am required to make 4 x 1/8" NPT holes in a class 150 blind flange and would like to know if the rules of UG-36 (Openings in Pressure Vessels) apply to the design. Thank you.

www.eng-tips.com

Opening in standard blind flanges - ASME (mechanical) Code Issues

I am designing a pressure vessel using compress software .the PV is 24" OD and has a bolted cover. we want to use standard slip on flange & blind flange but we need to make an opening in the blind and we can't do it in compress. 1) can we use a UG-34 cover with the same dimensions of standard...

www.eng-tips.com

The last one seems to be very helpful

To further add to that, I have found the following similar threads to be very valuable in the past

https://www.eng-tips.com/threads/multiple-holes-in-blind-flange-alternative-to-calculation.422659/

https://www.eng-tips.com/threads/small-hole-in-asme-b16-5-blind-flange.371342/

I think there's one more that I cant find right now, Ill post it if I find it

 

[FPPE]

To further add to that, I have found the following similar threads to be very valuable in the past

https://www.eng-tips.com/threads/multiple-holes-in-blind-flange-alternative-to-calculation.422659/

https://www.eng-tips.com/threads/small-hole-in-asme-b16-5-blind-flange.371342/

I think there's one more that I cant find right now, Ill post it if I find it

Thank you XL83NL, very useful!