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Technical Discussions
vivek
India, Joined Dec 2015, 5

vivek

India,
Joined Dec 2015
5
10:20 Feb-22-2016
sensitivity calculation in RT

Dear Experts,
we have a radiography film of 2 inch 5.54 mm thickness weld, technique is DWDI.
Now for calculating sensivity what should i take job thickness? (weld reinforcement is 1.5mm.)
1- 5.54+1.5 or
2- 5.54+1.5+1.5 or
3-(5.54+1.5)X2
where is it mentioned in sec 5?

 
 Reply 
 
Steven Doc
Other, Quality Manager
Siemens Energy, Egypt, Joined Feb 2011, 187

Steven Doc

Other, Quality Manager
Siemens Energy,
Egypt,
Joined Feb 2011
187
14:03 Feb-22-2016
Re: sensitivity calculation in RT
In Reply to vivek at 10:20 Feb-22-2016 (Opening).

I do not have the code to hand, however from memory your option 2 is the correct one.

I would not bet any money on it though before I read the code again.

1
 
 Reply 
 
Santosh Gaikwad
Consultant,
Material Testing & Inspection Services, India, Joined Feb 2010, 7

Santosh Gaikwad

Consultant,
Material Testing & Inspection Services,
India,
Joined Feb 2010
7
05:19 Feb-23-2016
Re: sensitivity calculation in RT
In Reply to vivek at 10:20 Feb-22-2016 (Opening).

your point no 1 is correct

as per your statement you have only 5 mm thk and off course single V ,so we can not consider root reinforcement for this

this is practical exercise ,

Regards
Santosh Gaikwad

 
 Reply 
 
Steven Doc
Other, Quality Manager
Siemens Energy, Egypt, Joined Feb 2011, 187

Steven Doc

Other, Quality Manager
Siemens Energy,
Egypt,
Joined Feb 2011
187
08:42 Feb-23-2016
Re: sensitivity calculation in RT
In Reply to Steven Doc at 14:03 Feb-22-2016 .

I would like to change my reply. Luckily I did not bet my house on it. :-D It is a pure red neck when I read back on it!!

The Correct answer is 3, 2 x nomial Wall Thickness and 2 reinforcement.

T276.2(a) States Welds with reinforcement IQI is based on single wall plus estimated reinforcement, as you are vieweing double wall you must consider double the wall and double the reinforcement...................unless you have machined flat both the inner and outer reinforcement, you should consider reinforcement in the calculation.
This paragraph also tells us that actual measurement for the weld is not neccesary, therefore to obtain our reinforcement figures we should refer to the manufacturing code.
If we use Section I as an example, Paragraph PW35.1 and its table tells us that for 5.54mm thickness up to 3mm can be added on each face of the weld and be acceptable to code. That would mean that the penetrated thickness could be (5.54+3+3)+(5.54+3+3) giving a total of 23.08mm. Unlikey, but if you apply the code strictly, you can use this.

One approach can be to agree an estimated reinforcement, as we cannot see the root side reinforcement. I like to take a practical approach and use the base material thickness (in your situation x 2) and base the IQI on this thickness (11.08mm) and check the sensitivity on the parent material.

This gives the Radiographers a decent crack at getting acceptable graphs on small bore piping using Gamma & D4.

 
 Reply 
 
Oliviero
NDT Inspector,
Quality Control srl, Italy, Joined Oct 2008, 414

Oliviero

NDT Inspector,
Quality Control srl,
Italy,
Joined Oct 2008
414
21:58 Feb-23-2016
Re: sensitivity calculation in RT
In Reply to vivek at 10:20 Feb-22-2016 (Opening).

Vivek,
do you need to calculate sensitivity, or do you need to determine the required IQI according to ASME BPVC sec. V?
If you need to determine the required IQI according to ASME BPVC sec. V read paragraph T-276.2(a) which states "Welds with reinforcement IQI is based on SINGLE wall plus estimated reinforcement ...".
The estimated reinforcement shall not be greater than the maximum reinforcement allowed by the relvant code section; but this does not justify to use the maximum allowable value, if the reinforcement is lower than maximum.
Don't forget that Heat Affected Zone is part of examined volume, and HAZ does not have any reinforcement.
When you cannot see the inside reinforcement of the weld, I suggest to consider the actual estimated reinforcement as zero.

 
 Reply 
 

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