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Technical Discussions
Ian
Ian
18:07 Jun-06-2015
Magnetic Flux Leakage

Hi, does anyone know why the Magnetic Flux Leakage technique is used to inspect piping (externally) as opposed to Ultrasonic Corrosion Mapping specifically in the Water industry?

Thanks

 
 Reply 
 
Bruce McPherson
Consultant
MFL Services, United Kingdom, Joined Mar 2009, 26

Bruce McPherson

Consultant
MFL Services,
United Kingdom,
Joined Mar 2009
26
09:36 Jun-08-2015
Re: Magnetic Flux Leakage
In Reply to Ian at 18:07 Jun-06-2015 (Opening).

I can't comment on the water industry, but in the oil and gas industry, huge amounts of ferrous piping are inspected using the Magnetic Flux Leakage technique compared to ultrasonic techniques because:
a. the equipment is less expensive
b. the inspection is faster
c. the level of operator skill required is lower

Best Regards

Bruce McPherson

 
 Reply 
 
chris
Consultant,
United Kingdom, Joined Dec 2012, 43

chris

Consultant,
United Kingdom,
Joined Dec 2012
43
11:35 Jun-08-2015
Re: Magnetic Flux Leakage
In Reply to Ian at 18:07 Jun-06-2015 (Opening).

MFL is very most sensitive to internal wall loss. Pigging is used extensively in large diameter pipes. UT corrosion mappind is usually carried out from an external surface to look for internall wall lose. It is not normally used internally due to coupling problems and masking caused by any internal concretions. MFL is not affected by non magnetic concretions and will also detect tight surface breaking cracks which UT corrosion mapping would not detect even under the most favourable circumstances. MFL scanners can also be used externally here UT corrosion mapping will give a more accurate wall thickness. Sometimes a MFL san is used to identify suspect areas and any critical regions are measured with UT.

 
 Reply 
 
Andreas
NDT Inspector, Specially in the oilfield
Tuboscope Vetco(Deutschland)Gmbh, Germany, Joined Oct 1999, 130

Andreas

NDT Inspector, Specially in the oilfield
Tuboscope Vetco(Deutschland)Gmbh,
Germany,
Joined Oct 1999
130
17:23 Jun-08-2015
Re: Magnetic Flux Leakage
In Reply to chris at 11:35 Jun-08-2015 .

Hallo Chris ,
internal wall loss detection by MFL ?
Detecting cracks when using it for crossion mapping?

I my experience you need a different setup for corrosion mapping at crack detection.

Wall loss detection difficult , may use only for monitoring and to be verify by UT.

MFL is sensitive to change in physically properties of the material under test.

Otherwise I agree with Bruce answers.



Regards

Andreas

 
 Reply 
 

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