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determining joint efficiencies

determining joint efficiencies

determining joint efficiencies

(OP)
Is there a simplified version or wording of UW-11, in ASME SECTION 8, Div. 1?

thanks

RE: determining joint efficiencies

1)  Double-Welded Butt Joint (Type 1)
                      E
    1.1  Full RT --> 100%
    1.2  Spot RT --> 85%
    1.3  No RT   --> 70%

2)  Single-Welded Butt-Joint (Type 2)
    (Backing Strip in place)
    2.1  Full RT --> 90%
    2.2  Spot RT --> 80%
    2.3  No RT   --> 65%

3)  Single-Welded Butt-Joint (Type 3)
    
    3.1  No RT  --> 60%


Note, equivalent welds to item 1.1 above include Single-Welded Butt-Joint back chipped and welded from the inside;
those may have 100% joint efficiency.

Weld Categories A, B, C, D (UW-3)

A --> Longitudinal Seams
B --> Circumfrential Seams
C --> Terminal Weld end in a flange
D --> Attachments

Type of Radiography

RT-1 --> Full lenght, full radiography of a;; butt welds
         (except >= NPS 10 or tn >= 1 1/8"

RT-2 --> Cat-A: Full Lenght
         Cat-B: T-joints

RT-3 --> Spot Radiography (UW-52)

RT-4 --> Partial / No Radiography

Seamless Heads & Vessel Sections   -->  100%
Piping SAW & Seamless --> 100% ERW -->  85%
  

RE: determining joint efficiencies

Q:  Is there a simplified....

A: No.  The best summary I know of is in the Pressure Vessel Handbook, Megyesy, part I section 7, welding of pressure vessels.  This goes into what they mean by "types" and "category" and levels of x-ray.  Then charts and tables tell you joint efficiency for various combinations of the above.  

Please don't take this the wrong way.  I do not know you, your problem or your background.  And I am new to this forum.  I strongly recommend you talk to a  specialist about this as there are many considerations to joint efficiency.

RE: determining joint efficiencies

Hi

go to PVeng.com and download the spreadsheet which give the data available in Megyeseys book in softform.

RE: determining joint efficiencies

Follow the advice of Isthill and look at the thread. You will get bad info. surfing around. Remember you must submitt calcs.to your AIA.

RE: determining joint efficiencies

Hi cookdog (Chemical)

I agree with deanc (Specifier/Regul) ask the AIA.

Leonard Stephen Thill
Leonard@thill.biz
www.thill.biz

RE: determining joint efficiencies

Very interesting thread.

thanx isthill & deanc



RE: determining joint efficiencies

HI cookdog (Chemical)

Also, Nooter Fabricators, Inc Quick reference Guide ASME PRESSURE VESSEL CODE (SECTION VIII, DIV. 1. Has all Testing Notes & Reference Notes.

The software program was free.

Leonard@thill.biz
www.thill.biz

RE: determining joint efficiencies

I would recommend to see Flow Chart Diagram in Appendix of ASME Section VIII Div 1. I have not felt any difficulty to determine joint efficiency since I that flow chart. I made a summarized excel spread sheet, but this is only for me because it is customized for my own use.

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