Large openings - Appendix 1-7 & U-2(g)

Hivris · **Joined:** Wed Oct 03, 2007 9:24 am **Posts:** 13

Dear All,

I have vessel with OD 24" and two nozzles OD=20" put on. Acc. to UG-36(b)(1) the openings are to be considered acc. to Appendix 1-7. As the nozzles are perpendicular to wall the 1-7-(a) shall be satisfied. The calc. program says that 1-7(c) and U-2(g) shall be considered too. I read it many times but I do not know what exactly shall be done.

Could you help me?
Thanks,
Roman

Gonzaga · **Joined:** Sat Dec 15, 2001 1:00 am **Posts:** 657

Hivris wrote:

Dear All,

I have vessel with OD 24" and two nozzles OD=20" put on. Acc. to UG-36(b)(1) the openings are to be considered acc. to Appendix 1-7. As the nozzles are perpendicular to wall the 1-7-(a) shall be satisfied. The calc. program says that 1-7(c) and U-2(g) shall be considered too. I read it many times but I do not know what exactly shall be done.

Could you help me?
Thanks,
Roman

It is a large openings and reinforcement shall follow rules of 1-7(c). Make further calculations to verify stability of such a large opening (U-2(g))
Mauro

Hivris · **Joined:** Wed Oct 03, 2007 9:24 am **Posts:** 13

I added refo plate and now there is only requirement for calculation acc. to U-2(g). As I am beginner in ASME calculations could you advise what exact stability calculation shall I make?
Note: I don`t know load from the piping as in my scope is only the vessel itself.

Thank you in advance!
Roman

akonrad · **Posted:** Thu Mar 26, 2009 5:37 pm

Hivris,
I am afraid you began from the wrong end. You took a tool that is meant to help you with the design. But "helping" assumes that you know how to do the design and you know what your program is doing. It's not a computer game, you can kill real people with your mistaken design. I suggest you take the code book and read it thorougly a couple of times before you can lay any confidence in your tools. Otherwise it's like prescribing a medicine when you don't know what it actually does (quite common in the UK these days, though).

Hivris · **Joined:** Wed Oct 03, 2007 9:24 am **Posts:** 13

Konrad,
you are probably right but you did not notice that we were talking about calculation not included in code. So reading of the code would be little bit useless.
Anyway, thank you for fruitful reply.
Hivris

akonrad · **Posted:** Thu Mar 26, 2009 6:12 pm

Hivris,
With all respect, you began from asking about 1-7-(a), 1-7(c) and U-2(g). Aren't they references to the code? And, of course U-2(g) requires you to follow the safety outlines from the Code, even if you magically develop your own design rules- you still need to know these books inside out!

PS Mauro, what do you exactly mean saying about stability? What is unstable in a welded branch?

Gonzaga · **Joined:** Sat Dec 15, 2001 1:00 am **Posts:** 657

akonrad wrote:

Hivris,
With all respect, you began from asking about 1-7-(a), 1-7(c) and U-2(g). Aren't they references to the code? And, of course U-2(g) requires you to follow the safety outlines from the Code, even if you magically develop your own design rules- you still need to know these books inside out!

PS Mauro, what do you exactly mean saying about stability? What is unstable in a welded branch?

Sorry, not very technical, if it is not stable it means that it is going to a more stable situation (e.g. fracture). Mauro

Large openings - Appendix 1-7 & U-2(g)

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