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Technical Discussions
Pauzi
Pauzi
02:05 Sep-03-1998
Corrosion Inspection by UT

Is there any standard/specification regarding UT of corrosion?. I mean, calibration, sensivity setting, and acceptance/rejection criteria.


 
 Reply 
 
Yosi Bar-Cohen
R & D,
Jet Propulsion Lab (JPL), USA, Joined Nov 1998, 26

Yosi Bar-Cohen

R & D,
Jet Propulsion Lab (JPL),
USA,
Joined Nov 1998
26
06:33 Sep-03-1998
Re: Corrosion Inspection by UT
: Is there any standard/specification regarding UT of corrosion?. I mean, calibration, sensivity setting, and acceptance/rejection criteria.

----------

Dear Mr. Pauzi,

There are many standards and specifications for NDE of corrosion
Most of the ones, with which I am familiar, are addressing specific
structures and they are manufacturer proprietary documents. There are
few generic documents that cover standard inspection procedures. As an
example, ASTM has a limited information in its E1004 Standards on Eddy current.

Yosi


 
 Reply 
 
Rolf Diederichs
Director,
NDT.net, Germany, Joined Nov 1998, 618

Rolf Diederichs

Director,
NDT.net,
Germany,
Joined Nov 1998
618
07:31 Sep-03-1998
Re: Corrosion Inspection by UT
: Is there any standard/specification regarding UT of corrosion?. I mean, calibration, sensivity setting, and acceptance/rejection criteria.

----

Yosi Bar-Cohen mentioned already in his message that you can find standards
addressing certain components.
Here in Germany we have a guideline called US1
'Thickness Measurement with Ultrasound' published by the German Society for NDT,
however so far only in German available,
but I heard that an English version is on the way.

See:
New German guidelines to wall thickness measurement - will be available in English
http://www.ndt.net/news/wt_guid.htm

The handbook contains information on ultrasonic testing of corroded components.
For instance, it is recommended to use an echo display for corrosion gaging since
a blind test is often not reliable enough (digital numbers only).
Also a proper probe characteristic is needed accordingly to the specific geometry
of corrosion. Nowadays are guided waves (lamb waves) used for corrosion testing of
specific structures and depicting the area as an c-scan image without the need to
move the probe (e.g. aircraft structures, pipes).
Examples are aircraft structures and pipes. But since it is a new method I think
there exist no standard yet (Maybe Ahmad Chahbaz knows more about it).

You may also find information browsing/searching NDT.net issue 1997 No. 10 which
focuses on "Ultrasonic Thickness Measurement" http://www.ndt.net/ut1097.htm.

Rolf Diederichs



 
 Reply 
 
Cheryl Simplot
Cheryl Simplot
05:27 Mar-23-1999
Re: Corrosion Inspection by UT
: : Is there any standard/specification regarding UT of corrosion?. I mean, calibration, sensivity setting, and acceptance/rejection criteria.

: ----

: Yosi Bar-Cohen mentioned already in his message that you can find standards
: addressing certain components.
: Here in Germany we have a guideline called US1
: 'Thickness Measurement with Ultrasound' published by the German Society for NDT,
: however so far only in German available,
: but I heard that an English version is on the way.

: See:
: New German guidelines to wall thickness measurement - will be available in English
: http://www.ndt.net/news/wt_guid.htm

: The handbook contains information on ultrasonic testing of corroded components.
: For instance, it is recommended to use an echo display for corrosion gaging since
: a blind test is often not reliable enough (digital numbers only).
: Also a proper probe characteristic is needed accordingly to the specific geometry
: of corrosion. Nowadays are guided waves (lamb waves) used for corrosion testing of
: specific structures and depicting the area as an c-scan image without the need to
: move the probe (e.g. aircraft structures, pipes).
: Examples are aircraft structures and pipes. But since it is a new method I think
: there exist no standard yet (Maybe Ahmad Chahbaz knows more about it).

: You may also find information browsing/searching NDT.net issue 1997 No. 10 which
: focuses on "Ultrasonic Thickness Measurement" http://www.ndt.net/ut1097.htm.

: Rolf Diederichs




 
 Reply 
 

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