Flange ring - ASME VIII

[mech8790]

Hi Everyone,

I am just wondering if a flange ring can be manufactured from a pipe or round bar and still comply with ASME VIII rules? If not, can a flange ring be rolled from flat plate or bar and then welded? What are the requirements for the weld?

 

[mech8790]

Hi Mike, thank you for your comments, you have made these points clear now. Additionally, I have checked Section II for a pipe material and I think as long as I avoid selection of a pipe with G5 comment it should be good to go. The only question I have got in my head is the calculations o flange rigidity in accordance with 2-14. Is this mandatory? I believe not. In my opinion definitely not for flanges calculated to UG-34, but I might be wrong.

 

[SnTMan]

mech8790, yes, it would be best to avoid using the higher allowables for flange design, where they exist. Note that the carbon steels and lo-chromes generally are not subject to this.

I doubt you would be required to meet 2-14 requirements, but I don't believe you have stated your design conditions. Would it be especially burdensome to meet it? (A little extra steel can be cheap insurance)

I don't quite get how you associate UG-34 with flange design. UG-34 is for flat heads.


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

 

[mech8790]

Mike, I agree on you comments regarding 2-14. Good to keep in mind. The only issue is that people tend to get minimum what they need so if a ring flange can be lighter or smaller (in terms of t value) they will definitely go for that. Obviously, adding more steel and meeting 2-14 requirements keeps the design safe.

I was referring to UG-34 separately, nothing to do with ring type flange but wanted to mention it here to make sure that the rules of 2-14 (if mandator) apply to UG-34 too. UG-34 is refereeing to Appendix 2 just to obtain value of W as far as I am concern.

 

[SnTMan]

No, 2-14 rules do not apply to heads.

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

 

[mech8790]

Perfect! Thank you Mike and everyone on this forum for the help! I can consider this topic to be closed now, all sorted out.

 

[pperlich]

@r6155, I think he's trying something like this:

https://www.transwaysystems.com/wp-...als/7-Manway 36 Assembly Parts VSC Page 7.png

Phil

http://www.quicktanks.com