THICKNESS GAUGING OF CLADDED/OVERLAID VESSELS/PIPING

[fmaj...@technip.com]

Dears,
I seak advise on how to calibrate the normal Ultrasonic Thickness metering
device to measure the thickness of C.S. Vessels and piping with clad or
overlay while they are in service (on stream inspection). The required
accuracy of reading is 1 mm Max.

Thanks








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[Institute of Inspection Technology & NDT IITNDT]

Dear,

 

        If you want exact measurement, it is better to produce similar calibration block of same material and as cladded to calibrate your D-Meter. But, as cladding use to be less thick you may not find much difference while velocity is concern in thickness measurement. (note the cladding fussion zone problems)

Sharief

[Shashank Vagal]

Try this; prepare mock ups with open cross sections and plot what you see in the D-meter against what you can measure by a vernier with a bit of etching the edges.You will get some clue and from there you can get going. Not difficult really. Good luck, Shashank Vagal --- On Thu, 6/8/09, Institute of Inspection Technology & NDT IITNDT <iit...@gmail.com> wrote:

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[Nilesh Pathare]

Hi,
You can calibrate your Digital thickness gauge for C.S. Vessel thickness gauging on Carbon steel material Step Wedge  preferably having nearest thicknesses to your job thickness.
They are available in range of 1-10 mm (1 mm step), or 5 -25 ( 5mm step).
For Twin crystal probe do the calibration on two different thicknesses.

For cladding material if cladding material of S.S. on C.S. pipe with low thickness ( below 10 mm) then there will be not much difference in measured thickness if you calibrate on C.S. block.
But if your pipe thickness is more than 15mm then you have to make a block of C.S. to Clad material having thickness same as your pipe.
If you are having variable thicknesses then you can make this blocks in 5mm steps.
you could not calculate the thickness by formula for unknown metal thickness.

Regards,
Nilesh Pathare.
ASNT NDT LEVEL III
+971552455983.

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Best Regards,

Nilesh Pathare