Applicability of UG-44(b) for Aluminium Standard flanges allowed as per Code case -2905

[kremenco]

Hi Friends,
Is it acceptable to use the UG-44(b)(4) formula given below to confirm the pressure temperature rating of an aluminium pipe standard flanges allowed as per Code Case 2905?




Thanks in advance.
Ranjit

 

[IdanPV]

The Code Case require the use of B31.3 Appendix L.

 

[GD2]

Hi Friends,
Is it acceptable to use the UG-44(b)(4) formula given below to confirm the pressure temperature rating of an aluminium pipe standard flanges allowed as per Code Case 2905?


View attachment 4367
View attachment 4366
Thanks in advance.
Ranjit

UG-44(b)(4) formula is used only if you want to evaluate the flange joint for the external loading. For this, you have to know the piping load (forces and moments) exerted on the vessel flange.
For determining the P-T rating, simply use ASME B31.3 Appendix L.

 

[IdanPV]

Anyway, it is better to use Code Case 2901 instead.
You may find the following links helpful:

Webinar Recap: 2024 Flange Design & Analysis | Code Case 2901 & More

Check out the Webinar to stay in the loop about 2024 Flange Design, Code Case 2901, and related topics.

info.thinkcei.com

ASME UG-44(b) Code Insight on Code Case 2901 | Leakage-Based Assessments and External Loads on Flanges

Explore the latest updates on pressure vessel design codes, ASME UG-44(b), and Code Case 2901 for evaluating external loads on flanges. Stay informed on industry trends and innovative load evaluation methods.

info.thinkcei.com

 

[kremenco]

Hi,
Thanks for the responses.
I think I have not made myself very clear in the post above.
The scenarion is that I am using Aluminium Weld Neck Flanges (1" NPS) on a pressure vessel. Since ASME B16.5 does not have Aluminium Flanges, I resort to code case 2905 that allows the use Aluminium flanges as per Appendix-L of ASME 31.3. on pressure vessel and select the pressure temprature rating accordingly.
Now my question is that is it acceptable to use the formula given in UG-44(b)(4) for evaluating the selcted aluminium flange based on the piping loads? If not , is there a procedure in ASME 31.3 to evaluate these flanges?
Kind Regards.
Ranjit

 

[GD2]

Hi,
Thanks for the responses.
I think I have not made myself very clear in the post above.
The scenarion is that I am using Aluminium Weld Neck Flanges (1" NPS) on a pressure vessel. Since ASME B16.5 does not have Aluminium Flanges, I resort to code case 2905 that allows the use Aluminium flanges as per Appendix-L of ASME 31.3. on pressure vessel and select the pressure temprature rating accordingly.
Now my question is that is it acceptable to use the formula given in UG-44(b)(4) for evaluating the selcted aluminium flange based on the piping loads? If not , is there a procedure in ASME 31.3 to evaluate these flanges?
Kind Regards.
Ranjit

What evaluation do you want to do? Because the flange is part of the pressure vessel (ASME Sec VIII Div 1), you will first design the PV using tools like COMPRESS, PV ELITE and then run WRC 107/537 typically built to the design tool. The verification is for the local stress on the vessel nozzle intersection.
Alternately, you evaluate the flange joint by the procedure given in UG-44(b).

 

[kremenco]

Definitely I want to do the evaluation of the flange as per the formula given in UG-44(b)(4) ; not the local stresses at the nozzle vessel intersection. My question is whether the formula is valid in my case as the flange material (aluminium alloy)it is not listed in ASME B16.5.

 

[Morcuse]

See UG-44(b) referring to "... may be evaluated for flanged joints with welding neck flanges chosen in accordance with (a)(2), (a)(9), and (a)(19)". I believe that should answer the question.