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- since 1996 -
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Technical Discussions
Kelly Mock
Kelly Mock
22:25 Oct-15-2013
UT limitations on welded SS thermowells
zoom image

Good day,
What are the practical limitations of UT examination on stainless steel thermowells? Pipe dimensions and flange ratings range but a common size would be approximately a 1.25” OD, .225” wall thickness on the pipe and a 2” 600# flange (approx 1”thick) with 4 to 8 bolt holes, raised face on one side. Weld prep is double J.
Is there a procedure that can satisfy the requirements of ASME B31.3 Normal? The grain boundaries appear to be interrupting shear wave inspection and the bolt holes limit the coverage that a compression wave can manage.
Thanks

    
 
 Reply 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 835

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
835
22:33 Oct-15-2013
Re: UT limitations on welded SS thermowells
In Reply to Kelly Mock at 22:25 Oct-15-2013 (Opening).

S'hydratent do UT? This is low operating pressure. How about PT on both side, so each weld and call it a day!

    
 
 Reply 
 
Kelly Mock
Kelly Mock
22:49 Oct-15-2013
Re: UT limitations on welded SS thermowells
In Reply to Michel Couture at 22:33 Oct-15-2013 .

Unfortunately it is a full penetration weld which they require full examination.

    
 
 Reply 
 
andrew cunningham
NDT Inspector
Canada, Joined Jun 2008, 238

andrew cunningham

NDT Inspector
Canada,
Joined Jun 2008
238
00:11 Oct-16-2013
Re: UT limitations on welded SS thermowells
In Reply to Kelly Mock at 22:25 Oct-15-2013 (Opening).

A weld scan with shear wave is not possible on SS welds. High angle compression probes may get through but the tooling contours on the sealing face will inhibit the scanning from this surface. You could use a 0 degree from the edge of the flange, but the bolt holes will restrict coverage. Also the stamps on the edge of the flange will need to be smoothed off before scanning. PT the well to flange weld on both sides is the way to go.

All the best

    
 
 Reply 
 
Csaba Hollo
,
Retired, Canada, Joined Feb 2010, 301

Csaba Hollo

,
Retired,
Canada,
Joined Feb 2010
301
00:42 Oct-16-2013
Re: UT limitations on welded SS thermowells
In Reply to Kelly Mock at 22:25 Oct-15-2013 (Opening).

You can do first leg refracted longitudinal beam sectorial phased array. You would need to do it from both sides of the flange in order to get your coverage.

I would mock up the joint and put calibration reflectors in the root, both fusion faces, especially at the extremities of your scans. Adjust your sensitivity accordingly, and pay attention to where your refracted shear beam reflectors are in the part.

Good luck.

    
 
 Reply 
 
collin maloney
NDT Inspector, - Plant Inspector
Applus RTD, Australia, Joined Nov 2000, 147

collin maloney

NDT Inspector, - Plant Inspector
Applus RTD,
Australia,
Joined Nov 2000
147
06:34 Oct-16-2013
Re: UT limitations on welded SS thermowells
In Reply to Kelly Mock at 22:49 Oct-15-2013 .

why not set it up like an imersion job. make up a jig and insert probe into the well and test from that way, watch out for water path. Follow up with PT as others have suggested

    
 
 Reply 
 
Mario Talarico
NDT Inspector,
Italy, Joined May 2010, 411

Mario Talarico

NDT Inspector,
Italy,
Joined May 2010
411
20:39 Oct-16-2013
Re: UT limitations on welded SS thermowells
In Reply to Kelly Mock at 22:25 Oct-15-2013 (Opening).

zoom image


controllo ad immersione

Kelly,
this works!
The thicknesses variables under the probe regulate the height of water in order to allow an input 'clean' without geometric secondary reflections due to the exterior of the weld bead.
Using a sample welded with the same dimensions of the piece to be checked and inserted inside reflectors, must define practically modes: probe (focused or not, frequency, diameter) and height of water for the probe in use (modulated with the thin sheet placed under the probe).
A variation in the angle of flat mirror metal can vary the angle of entry into the flange.
Once achieved the optimum operating conditions remove the sample from the ring, put in its place the workpiece to be checked, and rotates the tube 360 to control 100% of the welding.
Really fast!
Greetings
Mario
    
 
 Reply 
 
Csaba Hollo
,
Retired, Canada, Joined Feb 2010, 301

Csaba Hollo

,
Retired,
Canada,
Joined Feb 2010
301
21:00 Oct-16-2013
Re: UT limitations on welded SS thermowells
In Reply to Mario Talarico at 20:39 Oct-16-2013 .

I would love to see an ASME procedure for IRIS flaw detection and classification for weld volume/fusion flaws.

It is thinking out of the box for sure, but it might be easier said than done.

PS...Our company owns a few different variations of this sort of equipment, but we only use it for corrosion/erosion of tubular materials.

    
 
 Reply 
 
Brett Davis
Sales, Sales, Applications, Training, Services, NDT, Pipeline
PTC & DavisBrett LP, USA, Joined Oct 2012, 13

Brett Davis

Sales, Sales, Applications, Training, Services, NDT, Pipeline
PTC & DavisBrett LP,
USA,
Joined Oct 2012
13
20:57 Dec-03-2013
Re: UT limitations on welded SS thermowells
In Reply to Csaba Hollo at 21:00 Oct-16-2013 .

I have tried this very thing using IRIS but did not have sufficient time to finalize my results. I will be receiving my IRIS equipment tomorrow and will be more than happy to assist with this application. Please let me know if there is anything I can do to assist. I have been performing IRIS for 5 years now. Also, I am working on developing a probe that would lend itself very useful for this application. It will not be complete for awhile but if we could find extra funding we could expedite the development and make it a commercial product.

    
 
 Reply 
 

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