UW 16.1 question 1

[ME231]

Hi All,
I would like to design a Category D weld with weld details per Fig UW-16.1(a). However, this figure does not give me adequate joint preparation details. Infact, the other joint types on this figure also do not give this information. If this not of importance? Can I use any suitable joint preparation? Is it ok to simply compute the resultant stresses based off of the Internal pressure in the nozzle and a stress area based off of the dimension tc shown?
Thanks in advance!

 

[vesselfab]

it doesn't give full details???

what details is it missing??

 

[ME231]

vesselfab, please see attached
thanks

 

[vesselfab]

both the angle of the bevel and the root gap are YOUR decisions and your weld procedures. Although the bevel ange is a non essential variable, it's still what is best for your operation.

 

[ME231]

Thank you for your prompt response, vesselfab. That answers my first question. Could you please help me on my second question as well? How do I make sure the weld is strong enough. I understand that per UW15(b)(1), no calculations are required, although this is also something I dont understand. Why would no calculations be required to validate that the weld is adequate in strength.
Can I use tc as a throat thickness and use the regular stress = force/area calculation to validate my weld?

 

[DVWE]

ME231,

That's a good question, and perhaps someone on this forum has the answer.

I would follow the calculations as given in UW-16(b) and then perhaps doublecheck with your method of s = f/a.

 

[vesselfab]

i don't know what size nozzles you're talking about, but


ug-45(c)
uw-15(c)
ug-41(b)(1)

should be reviewed