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Technical Discussions
Manoj
NDT Inspector, NDT Technician
India, Joined Feb 2010, 12

Manoj

NDT Inspector, NDT Technician
India,
Joined Feb 2010
12
10:02 Apr-27-2013
MFL corrosion mapping

I am using Silverwing VS2i for (MFL)bottom floor corrosion mapping. Actually I have been faced some difficulty to do the scan on FRP coated bottom floor of the tank. As per the setting procedure I got only 1 mm sensor lift off. (Plate thickness was10 mm. FRP coat thickness was 6 mm). Generally almost of the tank bottom floor plates are appearing uneven and undulated surface.. Especially in this specific case the bottom floor has been coat lining and patch works also. There were enough chance to hit the sensor on the floor surface and getting false indications, There were no possibilities to prove up the mfl indications by manual UT.

I have to do one more tank mfl in the same condition. Please let me know have any amicable solution or suggestion for overcoming these things? How can I maintain the sensitivity and quality of the job?

Thanks in advance for all valuable suggestions.

Manoj

 
 Reply 
 
Bounatiro
NDT Inspector, QAQC
Csc- exp, Algeria, Joined Sep 2011, 58

Bounatiro

NDT Inspector, QAQC
Csc- exp,
Algeria,
Joined Sep 2011
58
22:29 Apr-08-2014
Re: MFL corrosion mapping
In Reply to Manoj at 10:02 Apr-27-2013 (Opening).

Mr Manoj

I have the same problem as you, i will do inspection next month for bottom of 9 mm thickness and 4mm FRP.
How did you do it

 
 Reply 
 
Manoj
Manoj
11:39 Apr-09-2014
Re: MFL corrosion mapping
In Reply to Bounatiro at 22:29 Apr-08-2014 .

Mr.Bounatiro

I used to VS2! Scanner, but now the new 3D version is available it can achieve at least 2mm sensor lift off in the same condition. It will be achieve little more gaps between the floor and sensor head. Manual UT proves up is impossible so you clearly communicate with the client regarding the limitations of technology. The hand scanner use to cover the maximum area of the floor. Confirm the floor preparation is enough to do execute the job and offer to them maximum coverage and accuracy as possible.

It’s really a challenging task, wish you all success.


 
 Reply 
 
gopi
Engineering, NDT Engineer
seeking long & Short term job - Freelancer, India, Joined Jun 2012, 26

gopi

Engineering, NDT Engineer
seeking long & Short term job - Freelancer,
India,
Joined Jun 2012
26
12:13 Apr-09-2014
Re: MFL corrosion mapping
In Reply to Manoj at 10:02 Apr-27-2013 (Opening).

Mr. Manoj,

For those type of jobs, proper cleaning is needed, and yellow shims are necessary, they give us the proper height, for further details u can read the settings mentioned on the equipment itself.



gopi

 
 Reply 
 
Thiru NDT Level III, Singapore
Engineering,
Singapore, Joined Mar 2013, 1

Thiru NDT Level III, Singapore

Engineering,
Singapore,
Joined Mar 2013
1
12:54 Sep-30-2015
Re: MFL corrosion mapping
In Reply to gopi at 12:13 Apr-09-2014 .

Hi,
I would like to hear your experience with scanning of bottom plates over FRP. Do let me know how comfortable you are with Silverwing Equipment?
Who are the MFL equipment manufacturers available in market?
Thanks

Thiru

 
 Reply 
 

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