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 -

AT-Automation Technology GmbH
AT -Automation Technology is a systems house for industrial image processing. AT offers thermographic ndt systems as well as high-speed 3D sensors.

417 views
Technical Discussions
V.JAGADISH
NDT Inspector
heisco, Kuwait, Joined Aug 2006, 7

V.JAGADISH

NDT Inspector
heisco,
Kuwait,
Joined Aug 2006
7
01:30 Aug-24-2006
back scatter clarification

Correct! A light image of the B means reject. A dark image or no image means accept
According to this answer if there is no image on the radiograph even though i placed a letter B on the back of film then how can i prove the interpretor that i have used a letter B and also I would like to know that is attaching Letter B is mandatory as per ASME SEC V. Kindly clear my doubt.


    
 
 Reply 
 
P V SASTRY
R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D, India, Joined Jan 2003, 195

P V SASTRY

R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D,
India,
Joined Jan 2003
195
01:31 Aug-25-2006
Re: back scatter clarification
Dear Shri Jagadish,

There are two issues to be addressed here.

As far as proving to the inspector that you have put
the 'B' - some amount of trust is imperative. Other
wise how do you prove to the inspector that you have
taken the radiograph of the said weld/component.

The second issue is the statement that if there is a
white'B', reject-no problem.

If there is no 'B', accept- no problem.

But the third part of the statement that If there is a
black'B' accept- This has to be taken with a little
bit of caution and circumspection.

As I mentioned earlier we have paid some extended
attention to the so called case of the black 'B' as
its appearance coincided with poor penetrameter
sensitivity in case of long exposures.

It is always not the case that you get a black 'B'
because of the radiation getting reflected from it. It
is possible, particularly when you are using High
energy radiation as in the case of Co-60, that the
back scattered radiationgets softened while
re-entering through the 'B' and darkens the film more
at that region than the rest. So you get a black 'B'
for the same reason as that of white 'B'.
You have an interesting case to discern the respective
darkening components i.e the reflected versus the back
scattered.

While this may not be true in every situation
protecting your film on the back side is a good idea
when you suspect back scatter.

Best of luck

P V SATRY


----------- Start Original Message -----------
: Correct! A light image of the B means reject. A dark image or no image means accept
: According to this answer if there is no image on the radiograph even though i placed a letter B on the back of film then how can i prove the interpretor that i have used a letter B and also I would like to know that is attaching Letter B is mandatory as per ASME SEC V. Kindly clear my doubt.
------------ End Original Message ------------




    
 
 Reply 
 

Product Spotlight

IRIS 9000Plus - Introducing the next generation of heat exchanger inspection.

Representing the seventh generation of the IRIS system, the IRIS 9000 Plus has nearly 200 years of c
...
ombined field inspection experience incorporated in its design. This experience combined with a strong commitment to quality and a history of innovation has made Iris Inspection Services® the undisputed leader in IRIS technology.
>

Lyft™: Pulsed Eddy Current Reinvented

PEC Reinvented—CUI Programs Redefined Corrosion under insulation (CUI) is possibly the greatest u
...
nresolved asset integrity problem in the industry. Current methods for measuring wall thickness with liftoff, without removing insulation, all have severe limitations. Eddyfi introduces Lyft — a reinvented, high-performance pulsed eddy current (PEC) solution. The patent- pending system features a state-of-the-art portable instrument, real- time C-scan imaging, fast data acquisition with grid-mapping and dynamic scanning modes, and flexibility with long cables. It can also scan through thick metal and insulation, as well as aluminum, stainless steel, and galvanized steel weather jackets. Who else but Eddyfi to reinvent an eddy current technique and redefine CUI programs. Got Lyft?
>

Semi-Automated Phased Array Immersion System for Small Composite Parts

Turn-key semi-automated system as an improved and affordable solution for inspection of small comp
...
osite parts. Includes support table, immersion tank, scanner, PA instrument, PC, Analysis software, database, wedge management and other options.
>

SONOAIR - air-coupled Phased Array Ultrasonic Inspection System

For highly attenuating materials, the performance of the system is critical. The ultrasonic sensors,
...
the scanning area and the system settings should be flexibly adapted to the test task and the material. These high expectations are met with the new and modular testing system SONOAIR. With the world’s first air-coupled phased-array UT inspection system SONOAIR we developed a technology that works with up to 4 transmitter and receiver channels with freely configurable square wave burst transmitters as wells as low noise receiving amplifiers.
>

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