where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

2885 views
Technical Discussions
Scott
Scott
01:46 Sep-16-2005
2% or Really 4% Sensitivity


The codes for radiography typically specify a 2-2T sensitivy level to be achieved.

Would this not really be a 4% level of sensitivity? The penetrameter is 2% of the thickness of the weld and the 2T hole diameter is 2x thickness of the penny. Does this not give 4% sensitivity?

2-2T really means, The 2 is 2% sensitivity (able to see 3 sides of the penny) and be able to see the 2T hole. But if you can see 3 sides but not the hole, is this still not 2% sensitivity.

Its a little confusing. Can someone please explain this.


    
 
 
S.V.Swamy
Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex , India, Joined Feb 2001, 787

S.V.Swamy

Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex ,
India,
Joined Feb 2001
787
05:14 Sep-18-2005
Re: 2% or Really 4% Sensitivity
Dear Scott,

The thickness of the penetrameter is so chosen that a difference in density of nearly 2% is seen on the film. The diameter of the hole, which is 2% of the strip is chosen so that a small detail like the hole is seen, thus confirming the technique's Image Quality. The sharpness of an image depends on several factors including the spectral quality of the radiation, the graininess of the film and the Source to the Film Distance. These need to be optimised so that a small detail like the penetrameter hole or a thin wire (for a DIN type penetrameter) is seen. That is the reason the penetrameter or penny is now called IQI Image Quality Indicator.

2-2T thus does not become 4%.

Swamy

----------- Start Original Message -----------
:
: The codes for radiography typically specify a 2-2T sensitivy level to be achieved.
: Would this not really be a 4% level of sensitivity? The penetrameter is 2% of the thickness of the weld and the 2T hole diameter is 2x thickness of the penny. Does this not give 4% sensitivity?
: 2-2T really means, The 2 is 2% sensitivity (able to see 3 sides of the penny) and be able to see the 2T hole. But if you can see 3 sides but not the hole, is this still not 2% sensitivity.
: Its a little confusing. Can someone please explain this.
------------ End Original Message ------------




    
 
 
Scott
Scott
05:27 Sep-18-2005
Re: 2% or Really 4% Sensitivity
Thats doesnt really answer what I was asking. The hole is not 2% of the strip (I assume you mean penny thickness)The diameter is 2x the tickness of the penny for the 2T hole. The 1T hole is 1X the thickness of the shim, which is 2% of th thickness of the weld. So I am still confused as to why a hole who's diameter is 4% of weld thickness is not considered 4% sensitivity.


----------- Start Original Message -----------
: Dear Scott,
: The thickness of the penetrameter is so chosen that a difference in density of nearly 2% is seen on the film. The diameter of the hole, which is 2% of the strip is chosen so that a small detail like the hole is seen, thus confirming the technique's Image Quality. The sharpness of an image depends on several factors including the spectral quality of the radiation, the graininess of the film and the Source to the Film Distance. These need to be optimised so that a small detail like the penetrameter hole or a thin wire (for a DIN type penetrameter) is seen. That is the reason the penetrameter or penny is now called IQI Image Quality Indicator.
: 2-2T thus does not become 4%.
: Swamy
: :
: : The codes for radiography typically specify a 2-2T sensitivy level to be achieved.
: : Would this not really be a 4% level of sensitivity? The penetrameter is 2% of the thickness of the weld and the 2T hole diameter is 2x thickness of the penny. Does this not give 4% sensitivity?
: : 2-2T really means, The 2 is 2% sensitivity (able to see 3 sides of the penny) and be able to see the 2T hole. But if you can see 3 sides but not the hole, is this still not 2% sensitivity.
: : Its a little confusing. Can someone please explain this.
------------ End Original Message ------------




    
 
 

Product Spotlight

Panther

M2M PANTHER is a phased-array equipment designed for both desktop and industrial applications, offer
...
ing unparalleled performance in a compact unit. It combines the speed required for industrial integrated Phased-Array Ultrasound (PAUT) solutions, with the most complete set of total focusing method (TFM) imaging techniques, making it the ultimate tool for R&D and procedure qualification.
>

FlexoFORM™

The FlexoFORM™ solution integrates flexible phased array probe technology in a scanner to solv
...
e the challenges that come with inspecting pipe elbows. When combined with a water column, this solution can be used to collect easy-to-interpret data on elbows with diameters ranging from 4.5 in. OD up to flat and offers many benefits.
>

Echomac® PA Rail Wheel Tester

MAC introduces two versions of Rail Wheel Testers using ECHOMAC® PA platform based on customer requ
...
irements.
>

CIVA 2017 UT Module

CIVA NDE Simulation Software is the world leader of NDT Simulation. The UT simulation Module incl
...
udes: - "Beam computation": Beam propagation simulation - "Inspection Simulation": Beam interaction with flaws or specimens The user can simulate a whole inspection process (pulse echo, tandem or TOFD) with a wide range of probes (conventional, Phased- arrays or EMAT), components, and flaws.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window