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Technical Discussions
ALI
India, Joined Feb 2014, 1

ALI

India,
Joined Feb 2014
1
21:24 Feb-03-2014
TR probe,gas turbine, PMI questions...can ne 1 help???

1)Anyone direct me to specific standard which says TR probe can be used only upto 50mm thickness and beyond that insp. is invalid whereas it is easy to prove mathematically it can be...
2)what tests are required for gas turbine burner inspection??
3)Can reduction of carbon content at a point on material be detected with PMI??

 
 Reply 
 
Rick Lopez
R & D,
John Deere - Moline Technology Innovation Center, USA, Joined Jul 2011, 191

Rick Lopez

R & D,
John Deere - Moline Technology Innovation Center,
USA,
Joined Jul 2011
191
23:38 Feb-03-2014
Re: TR probe,gas turbine, PMI questions...can ne 1 help???
In Reply to ALI at 21:24 Feb-03-2014 (Opening).

Ali,
I can't speak to numbers 1 and 2, but x-ray fluorescence (positive material identification) cannot detect carbon content at all. A destructive test is required. A related thread: http://www.ndt.net/forum/thread.php?admin=&forenID=0&msgID=43862&rootID=43777#43862

 
 Reply 
 
S V Swamy
Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex , India, Joined Feb 2001, 787

S V Swamy

Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex ,
India,
Joined Feb 2001
787
12:51 Feb-04-2014
Re: TR probe,gas turbine, PMI questions...can ne 1 help???
In Reply to Rick Lopez at 23:38 Feb-03-2014 .

Rick,

Agree with you. If grade identification is not needed and only local decarburization is to be detected, a portable vacuum based or argon flushed emission spectrometer may be able to do the job (actual sensitivity achieved in the field depends on several factors and thus the suitability of the technique needs to be established on proved specimens). Eddy current may also work (again needs to be proved first in a controlled laboratory environment).

I don't have actual hands on experience with both but am writing from the theory.

I would like to know your own expert views on this.

Best regards.

Swamy

 
 Reply 
 
Rick Lopez
R & D,
John Deere - Moline Technology Innovation Center, USA, Joined Jul 2011, 191

Rick Lopez

R & D,
John Deere - Moline Technology Innovation Center,
USA,
Joined Jul 2011
191
21:29 Feb-04-2014
Re: TR probe,gas turbine, PMI questions...can ne 1 help???
In Reply to S V Swamy at 12:51 Feb-04-2014 .

Swamy,
I can't offer an expert opinion, but I believe that destructive techniques for carbon can be spectrochemical-based (e.g. glow discharge atomic emission spectrometer, or optical emission spectroscopy), or combustion-based. Equipment is usually stationary and in a lab environment, but as you say, portable spectrochemical equipment does exist. Samples are generally flat (e.g. cylindrical) for spectrochemical, and are often machined turnings for combustion analysis. Careful surface preparation or sample gathering is key. With determination either set of techniques could be used for depth profiling. I'll take your word regarding use of EC, as nailing down the effects of the many variables involved in the relationship sounds like a big study :)

 
 Reply 
 

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