Weld calculations for studded flange on circular cover
Weld calculations for studded flange on circular cover
(OP)
I have a 40" blind flange, 3" thick that will have a 5.5" diameter hole bored offcenter, with a 4" studded flange welded over that hole with a 3/4" inner fillet and a 9/16" outer fillet securing the studded flange. Design conditions are 150psi internal pressure & 320F, all materials 316L.
I have been tasked with performing weld calculations. I am referring to UG-37,-40,-41 & UW-15,-16 and following L-7.4 as the closest example I could find.
I was able to find some information on a studded flange for this calculation in Fig. UG-40(a-1), but I am uncertain about certain values to use for calculations, specifically values for A_2 shown in Fig. UG-37.1.
Per UG-40(a-1), t_n=0. For A_2 = 5*(t_n-t_rn)*f_r2*t, I will wind up with a negative number if I have any value for t_rn. If I just consider the cross sectional area of the studded flange itself, based on the hatched section of Fig UG-37.1, I come up with around 50 in^2, but this is not how the area is calculated per formulas for A_2.
What am I missing?
Thanks,
Tim
EDIT: To answer my own question, I am (was) missing UG-37(b)(2), and I've been barking up the wrong tree. UG-39 does not mention weld reinforcement. I just need to find the section in the code that covers weld calculations for my application
I have been tasked with performing weld calculations. I am referring to UG-37,-40,-41 & UW-15,-16 and following L-7.4 as the closest example I could find.
I was able to find some information on a studded flange for this calculation in Fig. UG-40(a-1), but I am uncertain about certain values to use for calculations, specifically values for A_2 shown in Fig. UG-37.1.
Per UG-40(a-1), t_n=0. For A_2 = 5*(t_n-t_rn)*f_r2*t, I will wind up with a negative number if I have any value for t_rn. If I just consider the cross sectional area of the studded flange itself, based on the hatched section of Fig UG-37.1, I come up with around 50 in^2, but this is not how the area is calculated per formulas for A_2.
What am I missing?
Thanks,
Tim
EDIT: To answer my own question, I am (was) missing UG-37(b)(2), and I've been barking up the wrong tree. UG-39 does not mention weld reinforcement. I just need to find the section in the code that covers weld calculations for my application





RE: Weld calculations for studded flange on circular cover
So, again, what am I missing?
RE: Weld calculations for studded flange on circular cover
Your weld strength paths should look something like the attached.
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Weld calculations for studded flange on circular cover
I've attached a drawing of my flange assembly, since it differs slightly from your attachment.
If I use A1, A5, & A42, it appears that I miss out on one of my welds. Is that not so?
RE: Weld calculations for studded flange on circular cover
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Weld calculations for studded flange on circular cover
RE: Weld calculations for studded flange on circular cover
W1-1 = (A5 + A42) * Sv, A2 & A41 = zero.
W2-2 = (A42 + A43) * Sv, A2 = zero.
I'll admit, UG-41 is not my best thing :)
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Weld calculations for studded flange on circular cover