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946 views
03:07 Feb-18-2003

Rolf Diederichs

Director, Editor, Publisher, Internet, PHP MySQL
NDT.net,
Germany,
Joined Nov 1998
602
How to detect cracks in dams

On behalf of a reader I post this message:
I am not sure if UT could work, but what about GPR or IRT?
------
Dear Mr. Diedericks,

We have divers that do maintenance and repair dams underwater. I was asked if there is an acoustical mean (ultrasound or else) that could be used underwater to detect cracks in dams as a preventive measure.

Thank you for paying attention to my request.

Regards!


 
03:27 Feb-18-2003
Franc Buijsen
Re: How to detect cracks in dams Assuming the dams are of steel. Cracks can be found underwater by means of eddy current or magnetic. Both techniques are intensively used on the North sea and in the harbours. There are a lot of companies in The Netherlands and the UK offering this service. We have trained divers to do this kind of work.


Franc


: On behalf of a reader I post this message:
: I am not sure if UT could work, but what about GPR or IRT?
: ------
: Dear Mr. Diedericks,
:
: We have divers that do maintenance and repair dams underwater. I was asked if there is an acoustical mean (ultrasound or else) that could be used underwater to detect cracks in dams as a preventive measure.
:
: Thank you for paying attention to my request.
:
: Regards!
.



 
02:59 Feb-19-2003

Todd Allen

Consultant, Ground Penetrating Radar ( GPR )
Radarview Concrete and Underground 3D Imaging,
USA,
Joined Jan 2003
7
Re: How to detect cracks in dams If the Dam is concrete, GPR is great for thickness, and reinforcement location, but for cracks you need to use the Ultrasonic Impact-Echo method. If you need more information call me at 281-705-9476 (USA).

Thanks,
-Todd Allen

: On behalf of a reader I post this message:
: I am not sure if UT could work, but what about GPR or IRT?
: ------
: Dear Mr. Diedericks,
:
: We have divers that do maintenance and repair dams underwater. I was asked if there is an acoustical mean (ultrasound or else) that could be used underwater to detect cracks in dams as a preventive measure.
:
: Thank you for paying attention to my request.
:
: Regards!
.



 
08:58 Feb-20-2003

Neil Gibson

Director
CNS Farnell Ltd,
United Kingdom,
Joined Jul 2003
2
Re: How to detect cracks in dams : On behalf of a reader I post this message:
: I am not sure if UT could work, but what about GPR or IRT?
: ------
: Dear Mr. Diedericks,
:
: We have divers that do maintenance and repair dams underwater. I was asked if there is an acoustical mean (ultrasound or else) that could be used underwater to detect cracks in dams as a preventive measure.
:
: Thank you for paying attention to my request.
:
: Regards!
.

The ultrasonic pulse velocity technique is widely used to detect cracks in concrete structures (assuming your dam is concrete! CNS Farnell can supply instruments and transducers for this purpose. Transducers for use at depths much below 1-2m are not standard but can be made. You will need access to both sides of the dam to detect cracks and other defects.

Take a look at our website www.cnsfarnell.com or call me for more information on +44 (0)20 8238 6900



 
05:50 Dec-11-2003
asif
Re: How to detect cracks in dams i m student of msc civil engg. i have to deliver a presentation so plz post it to me
thanks
asif


 


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