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Last Shout - Posted by: Matt - Saturday, 14 August 2010 23:25
Well, it's been dead around here for a while. I guess it just isn't going to catch on. Sucks because there was a ton of money and time invested in this place. Has all the potential to be the most resourceful inspection website around, but if it isn't used then what's the point? Anyways, thanks to all that have contributed so much. The lights will be off soon....Matt
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Author Topic: Best inspection technique to locate a crack?  (Read 991 times)
LaOxy
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« on: January 14, 2010, 09:27:29 AM »
Should we use PT to MT?
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MBazan
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« Reply #1 on: January 14, 2010, 11:35:00 AM »
Maybe x-ray
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Mike Bazan
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« Reply #2 on: January 15, 2010, 02:00:05 PM »
Looks like you found it! Techniques vary depending on material of construction, geometry, etc.

Is this a pipe, tank or pressure vessel?
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Matt
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« Reply #3 on: January 15, 2010, 02:01:54 PM »
Quote from: MBazan on January 14, 2010, 11:35:00 AM
Maybe x-ray

Whats been going on Mike?
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MBazan
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« Reply #4 on: January 15, 2010, 03:23:57 PM »
Hanging in there. Still working out here at DOW Laporte with Team. Are you still with Techcorr?
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Mike Bazan
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RDuwe
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« Reply #5 on: January 17, 2010, 11:02:39 AM »
RT sux for crack location; the depth axis of the crack must be pretty perpindicular to the film to see a crack.  RT a phonebook and it looks like a solid chunk of wood with absolutely no voids.

MT is quickest for accessible cracks on the OD of ferromagnetic stuff [some Inconel and a very small ammount of stainless is magnetic].  Thus most Inspectors MT the inside of boiler DA tanks.  Dry powder MT needs very little surface cleaning.  Wet MT 'WFMT' requires a very clean surface so the 'mag juice' will wet and  flow well. 

PT works on any non-porous material.  I've even PT'd some plastic pipe looking for a possible backhoe stress crack.  BUT - PT requires the surface to be 'squeaky' clean.  Thus the first step in any PT exam is cleaning with solvent or detergent.

Next consideration is repair/excavation method.  If the guys are going to air-arc CAC out the crack(s), MT is fine.  Just have to re-MT the excavation to ensure that ALL the crack is cone.  If they are going to grind out the crack, Visible-dye PT [the red stuff] is best.  Give the guys some of your developer.  That way, when they think they have 'bottomed out' and found both ends of the crack, they can redevelop the area.  Any remaining crack will show up, because your original application of the dye got it all the way to the bottom and ends of that crack.  It is VERY common for the guys to grind until the crack gets very tight and short, and loose sight of it in the grinder scratches, and quit.  When they redevelop, that little bit remaining will be REAL easy to find.

For inaccessiible ID's, probably the best is the EPRI UT procedure using 'creeping waves' and a specially trained tech.  Best 'ducer for stainless is a WSY-70.  Works well on carbon also.
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Roger D. Duwe  CWI, API-510, 570, 653
Wiggy
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« Reply #6 on: January 19, 2010, 10:41:12 AM »
I'd say Shearwave or Eddy Current, depending if you're looking for cracks in a weld or scanning the surface during CUI inspection on stainless piping.
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Chris Wiggin
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« Reply #7 on: January 24, 2010, 07:47:43 PM »
Quote from: MBazan on January 15, 2010, 03:23:57 PM
Hanging in there. Still working out here at DOW Laporte with Team. Are you still with Techcorr?

No Sir. Mistras atm
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3APIGUY
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« Reply #8 on: February 01, 2010, 04:02:11 PM »
Looks like a moldy taco. LOL
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