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 -

1096 views
Technical Discussions
RT. JEYAKUMAR
NDT Inspector
Singapore, Joined Aug 2002, 10

RT. JEYAKUMAR

NDT Inspector
Singapore,
Joined Aug 2002
10
09:50 Nov-29-2005
CHIME TECHNIQUE

Dear Sir,

Is that chime technique use of both shear wave angle along with surface wave. If so, there is chance missing flaws on the back surface, since surface wave could not travel through.

Can anyone please kindly explain about it?

Thank you very much

With regards,

RT. Jeyakumar


    
 
 Reply 
 
Alan Maclean
Alan Maclean
05:00 Dec-06-2005
Re: CHIME TECHNIQUE
----------- Start Original Message -----------
: Dear Sir,
: Is that chime technique use of both shear wave angle along with surface wave. If so, there is chance missing flaws on the back surface, since surface wave could not travel through.
: Can anyone please kindly explain about it?
: Thank you very much
: With regards,
: RT. Jeyakumar

The CHIME technique as it names suggests has creeping waves propagating along the top and inner surfaces which in turn generate headwaves between the inner and outer surfaces.

Regards

Alan Maclean


------------ End Original Message ------------




    
 
 Reply 
 
J. Mark Davis
Teacher, And Consultant
University of Ultrasonics, Birmingham, Alabama, USA, Joined Mar 2000, 85

J. Mark Davis

Teacher, And Consultant
University of Ultrasonics, Birmingham, Alabama,
USA,
Joined Mar 2000
85
03:58 Dec-06-2005
Re: CHIME TECHNIQUE
I have not heard of the CHIME Technique? Then I see the mention to what looks like ID and OD Creeping Waves. Then I see a reference to Shear Waves with Surface Waves.

Is the CHIME Technique another name for the Creeping Technique that we usually reference as ID Creeping Waves. These are the result of Mode Conversions that take palce at the ID or Opposite Surface which is the scanning surface.

Is the CHIME an acronym? Is so, what does it mean?

Sincerely,

J. Mark Davis
----------- Start Original Message -----------
: : Dear Sir,
: : Is that chime technique use of both shear wave angle along with surface wave. If so, there is chance missing flaws on the back surface, since surface wave could not travel through.
: : Can anyone please kindly explain about it?
: : Thank you very much
: : With regards,
: : RT. Jeyakumar
: The CHIME technique as it names suggests has creeping waves propagating along the top and inner surfaces which in turn generate headwaves between the inner and outer surfaces.
: Regards
: Alan Maclean
:
------------ End Original Message ------------




    
 
 Reply 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
09:31 Dec-07-2005
Re: CHIME TECHNIQUE
Hello Mark

A blurb appears in December's Insight - "A new approach to pipe and vessel inspection for corrosion and cracking" for Veritec Sonomatic's CHIME service. It says CHIME is Creeping Headwave Inspection MEthodology. and uses a combination of ultrasonic headwaves and creeping waves, plus pulse-echo backscatter reflective techniques. It appears to be qualitative rather than quantitaive as it is claimed the system can differentiate material thinning into three categories, <10%t, 10-40%t and >40%t.

Hope this helps

regards

Nigel


----------- Start Original Message -----------
: I have not heard of the CHIME Technique? Then I see the mention to what looks like ID and OD Creeping Waves. Then I see a reference to Shear Waves with Surface Waves.
: Is the CHIME Technique another name for the Creeping Technique that we usually reference as ID Creeping Waves. These are the result of Mode Conversions that take palce at the ID or Opposite Surface which is the scanning surface.
: Is the CHIME an acronym? Is so, what does it mean?
: Sincerely,
: J. Mark Davis
: : : Dear Sir,
: : : Is that chime technique use of both shear wave angle along with surface wave. If so, there is chance missing flaws on the back surface, since surface wave could not travel through.
: : : Can anyone please kindly explain about it?
: : : Thank you very much
: : : With regards,
: : : RT. Jeyakumar
: : The CHIME technique as it names suggests has creeping waves propagating along the top and inner surfaces which in turn generate headwaves between the inner and outer surfaces.
: : Regards
: : Alan Maclean
: :
------------ End Original Message ------------




    
 
 Reply 
 
J. Mark Davis
Teacher, And Consultant
University of Ultrasonics, Birmingham, Alabama, USA, Joined Mar 2000, 85

J. Mark Davis

Teacher, And Consultant
University of Ultrasonics, Birmingham, Alabama,
USA,
Joined Mar 2000
85
03:53 Dec-08-2005
Re: CHIME TECHNIQUE
To All,

To add to Paul's comments:

The High Angle L-Wave with the Creeping Wave Technique can be calibrated for a Time of FLight (TOF)measurement which can provide a quantative depth or crack height measurement.

(Note: I have used only the Creeping Wave Method three (3) times to pass the EPRI NDE Center Crack Sizing Exam to show it can be a quantative method. I will add that it is "normally" a qualitative method for crack sizing as Paul mentioned. All this is really based upon the critical flaw depth)

In addition to the TOF L-wave, the echo dynamnics of the mode converted signal (Shear wave mode converted to an L Wave, and reflected as an L Wave, called CE-1) is a very useful piece of data for crack depth measurments. This is qualitattvie

To conlcude, it is the combination of absence or presence of the 3 signals (L-wave, CE-1 and CE-2) as well as echo dynamics and the TOF of the High Angle L-wave that provide qualitative or quantative crack height information.

Calibration is conducted on a block of similar material type as the component as to be examined, with notches of varying depth, i.e., 20 %, 40 %, 60 %, and 80 %. A signal pattern is observed from each notch and a comparison is made from the notches to the crack. This can be a subjective or objective analysis.

Please go to the ndt.net publications section to view the intorductory chapter from the Handbook on Advanced UT Flaw Sizing. This will expalin the wave physics assoiated with using Creeping waves.

I myself will be speaking with Paul about his probe designs using creeping waves for a CHIME Technique.

Sincerely,

J. Mark Davis

----------- Start Original Message -----------
: Hello Mark
: A blurb appears in December's Insight - "A new approach to pipe and vessel inspection for corrosion and cracking" for Veritec Sonomatic's CHIME service. It says CHIME is Creeping Headwave Inspection MEthodology. and uses a combination of ultrasonic headwaves and creeping waves, plus pulse-echo backscatter reflective techniques. It appears to be qualitative rather than quantitaive as it is claimed the system can differentiate material thinning into three categories, <10%t, 10-40%t and >40%t.
: Hope this helps
: regards
: Nigel
:
: : I have not heard of the CHIME Technique? Then I see the mention to what looks like ID and OD Creeping Waves. Then I see a reference to Shear Waves with Surface Waves.
: : Is the CHIME Technique another name for the Creeping Technique that we usually reference as ID Creeping Waves. These are the result of Mode Conversions that take palce at the ID or Opposite Surface which is the scanning surface.
: : Is the CHIME an acronym? Is so, what does it mean?
: : Sincerely,
: : J. Mark Davis
: : : : Dear Sir,
: : : : Is that chime technique use of both shear wave angle along with surface wave. If so, there is chance missing flaws on the back surface, since surface wave could not travel through.
: : : : Can anyone please kindly explain about it?
: : : : Thank you very much
: : : : With regards,
: : : : RT. Jeyakumar
: : : The CHIME technique as it names suggests has creeping waves propagating along the top and inner surfaces which in turn generate headwaves between the inner and outer surfaces.
: : : Regards
: : : Alan Maclean
: : :
------------ End Original Message ------------




    
 
 Reply 
 

Product Spotlight

GUL QSR1® Scanning

How do you measure pipe wall thickness without direct access to the area? QSR® Scanning - Guide Wav
...
e Quantitative Short Range Scanning.
>

Navic - Steerable Modular Automated Scanner

The Navic is a modular, motorized, steerable scanner designed to carry multiple attachments used
...
in various scanning and inspection applications. The Navic is capable of weld scanning (girth welds and long seam welds), automated corrosion mapping, and tank scanning.
>

NDTkit RT

NDTkit RT, TESTIA's Digital Radiography software The NDTkit product line software for X-ray analysi
...
s. NDTkit RT is a software benefiting from the Ultis kernel which is dedicated to radiographic image analysis. It offers a set of tools and filtering processes to assist RT operators in finding relevant flaws.
>

SITEX CPSERIES

Teledyne ICM’s CPSERIES has been designed with a view to revolutionizing the handling and perfor
...
mances of portable X-Ray sets. Despite having managed to halve the weight of similar portable X-Ray generators available on the market (while continuing to provide the same power output), the SITEX CPSERIES generators feature a shutter, a laser pointer, a beryllium window, an aluminum filter and two integrated diaphragms (customized sizes are available upon request). Without compromising the robustness and reliability for which ICM products are renowned, the small size and light weight of the SITEX CPSERIES will radically change the way that you perform your RT inspections. And you will see a positive impact in terms of both quality and return on investment (ROI).
>

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