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- since 1996 -

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Technical Discussions
gajendran
NDT Inspector
India, Joined Jul 2009, 4

gajendran

NDT Inspector
India,
Joined Jul 2009
4
08:09 Jan-08-2010
Conventional Angle Beam on 1" pipeline

Dear Sir,

Is there any way to do angle beam inspection on 1" pipeline with 3mm thickness?

    
 
 
Sang Kim
Consultant, NDT Trainer
Guided Wave Analysis LLC, USA, Joined Feb 2008, 44

Sang Kim

Consultant, NDT Trainer
Guided Wave Analysis LLC,
USA,
Joined Feb 2008
44
14:09 Jan-08-2010
Re: Conventional Angle Beam on 1" pipeline
In Reply to gajendran at 08:09 Jan-08-2010 (Opening).

Dear Gajendran,

You can test 1-inch-OD pipeline with torsional ultrasonic wave. Because the wall thickness of the tube is 3 mm (Cut-off frequency of T(0,2) mode of 3-mm wall pipe is about 520 kHz), you can inspect the pipe with 250-kHz MsS probe. Using ultrasonic shear couplant, you can quickly test the tube. If you want to located the defect along the pipe circumference, you can use sectional probe to scan along the pipe circumference. We can generate the guided wave along the circumferential or axial direction. With the torsional mode or shear-horizontal mode at 250-kHz center frequency (wavelength 12.7 mm), it can find very small defect compared to 100-mm wavelength at 32 kHz torsional mode.

The high-frequency guided wave is used for inspecting short-range high-resolution inspection using shear-horizontal mode. The other application is to inspect pipe support area, pipe clamp, wall penetration, pipe in concrete vaults, and sleeved pipe.

For more information about MsS guided wave technology, please check this website (http://www.gwanalysis.com).

Sang

    
 
 
Tom Nelligan
Engineering,
retired, USA, Joined Nov 1998, 390

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
14:58 Jan-08-2010
Re: Conventional Angle Beam on 1" pipeline
In Reply to gajendran at 08:09 Jan-08-2010 (Opening).

Yes, you can use either a small 70 degree angle beam that has been axially contoured, or an even smaller 70 degree intergral angle beam assembly. We've had customers who successfully do angle beam inspection on tubing as small as 15 mm diameter. If you're interested in specific part number recommendations from the Panametrics-NDT product line of Olympus NDT, please contact me.

    
 
 
Michael Moles †2014 *1948
, Joined ,
16:32 Jan-08-2010
Re: Conventional Angle Beam on 1" pipeline
In Reply to Tom Nelligan at 14:58 Jan-08-2010 .

You can even do AUT with phased arrays these days. Olympus NDT has commerciallized the COBRA scanner, which goes down to 0.8" diameter. It also uses arrays focused in the lateral direction to minimize beam spread. Like Tom says, you would probably want to use high angle beams (S-scans in this case).

Michael Moles

    
 
 

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