Geometric Unsharpness and discountinuity size related to RT

[Hareesh K V]

Dear Group Members,

Related to : Radiography Examination 

Can we add the value of geometric unsharpness to the discountinuity size acceptability value for accepting a discontinuity. 

Governing codes: 

ASME BPVC Sec V & ASME B 31.3

Example. 

Say Up to 2mm porosity is acceptable as per the code.

We have established the geometric unsharpness value by procedure qualification of the technique and observed as 0.2

My question is, can we accept a porosity of 2.4mm by adding (0.2x 2times Ug for both the sides of the discountiuity) the geometric unsharpness to the acceptability value of 2mm.

Please advise with code references or code interpretations. 

Regards, 

Hareesh K V

8547859202

[SENTHILKUMAR SWAMINATHAN]

Answer is  NO 

To minimise the unsharpness code given acceptable value. 

Sent from Yahoo Mail on Android

--
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-weld...@googlegroups.com.
Visit this group at https://groups.google.com/group/materials-welding.
For more options, visit https://groups.google.com/d/optout.

[Hareesh K V]

Dear Sir, 

"Answer is  NO "

Code reference please. 

"To minimise the unsharpness code given acceptable value. "

That is what I mentioned that the Ug as established by procedure qualification....

I request an open discussion and logical approach on this topic...

Regards, 

Hareesh K V

[SENTHILKUMAR SWAMINATHAN]

Hareesh

https://www.sciencedirect.com/topics/engineering/geometric-unsharpness
Regards, 

S.SENTHILKUMAR 

Sent from Yahoo Mail on Android

On Tue, 23 Apr 2019 at 11:17, Hareesh K V

<haree...@gmail.com> wrote:

[George Dilintas]

according to the Code you cannot

--

https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-weld...@googlegroups.com.
Visit this group at https://groups.google.com/group/materials-welding.
For more options, visit https://groups.google.com/d/optout.

--

Dr. Georgios Dilintas,

Dipl. Ing. In Aeronautic and Space Engineering

Ph.D in Mechanics of Solids - Computational Mechanics

A.I.S, A.N.I, IRCA Lead Auditor

Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis

[Hareesh K V]

Please give the code reference/clause.

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CAPOi40CVrfEZAeO2HjLaoz2F1p3pUJH3S7R6EdC-QTL48318yQ%40mail.gmail.com.

[George Dilintas]

There is no specific reference. The Ug is a criterion for accepting RTs and not for accepting of defects. This is self explanatory and thus there is no need for specific Code paragraph 

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CAM3LgAUBHU5O28W2rtbVrBzQMjuCNX0WHwZyW5kXOarcAWtCKw%40mail.gmail.com.

[Hareesh K V]

Dear sir, 

I agree with you. 

Please go through the below condition. 

Ug is 0. 2mm

Suppose the actual defect size is 2mm. Then in the radiography films it will show as 2.4mm.

If the upperlimit for that defect as per governing code is 2mm,  will you accept this defect or not?

If the Ug is less, the same defect can be accepted and if Ug is more, the same defect will get rejected. 

Regards, 

Hareesh K V

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CAPOi40DvizPoQheCnG01O0xsSKxUiU__kYdCC5f2gD1ePcTFqw%40mail.gmail.com.