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Question on Sect VIII UG-27 T-Min.

Question on Sect VIII UG-27 T-Min.

Question on Sect VIII UG-27 T-Min.

(OP)
Hello,
  I have just recently taken a job within a jurisdictional state.  When determining T-Min on a vessel shell under internal pressure only I use UG-27 with stress values out of Section 2 part D correct?  The reason I ask one of our vessels onsite was calculated up to be a minimum required thickness of 0.150".  But I pulled the design calcs from the manufacturer and the minimum required is 0.214".  I was just unsure if I should use the calcs from the manufacturer or my calcs from Sect. VIII for remaining life calcs.  I took the API 510 exam and am pretty sure the class was taught to use UG-27 for these purposes.  Please if anyone can help that would be great and thank you in advance!

RE: Question on Sect VIII UG-27 T-Min.

Did you add the corrosion allowance?

RE: Question on Sect VIII UG-27 T-Min.

(OP)
Yes according to U-1 zero corrosion allowance.  Thank you though.  I am really just trying to make sure that I am going to the right place to determine T-Min for an Inservice vessel.

RE: Question on Sect VIII UG-27 T-Min.

HightyHo, are both sets of calcs using same joint efficiency? Is pipe tolerance involved? Both same diameter basis, i.e. ID / OD? Any thinning involved as in a head?

Check those things as well as allowable stresses.

Regards,

Mike

RE: Question on Sect VIII UG-27 T-Min.

You may be looking at a difference because the new Code allowables are HIGHER than that in years past.  I think the change occurred in 1999 or 2000.

Joe Tank

RE: Question on Sect VIII UG-27 T-Min.

(OP)
Ok thank you Joe that is probably what the issue is about stress values.  Also the manufacturer design calcs included wind, seismic load calcs that I believe made the t-min higher.  Thank you everyone the help is very much appreciated!!

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