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Technical Discussions
Azhar Jamil
Azhar Jamil
23:38 Jan-27-2010
NDT of turbine blades.

Dear all,

I want to perform the NDT of Turbine blades (with curved fir tree root) remvoved from rotor. Can any one comment on the following:

1) Which NDT technique is preferred to inspect the blades specifically root area. As per my knowledge Flourescent MPI (FMPI) is normally done
2) Which type of FMPI will give best results?
3) If we used Hand Yoke, will this be OK / sufficient or not?
4) If there is any other better way than yoke method, please giev brief detail.

Thanks & Regards
Azhar

    
 
 Reply 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 847

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
847
03:20 Jan-28-2010
Re: NDT of turbine blades.
In Reply to Azhar Jamil at 23:38 Jan-27-2010 (Opening).

Azhar,

You are giving very little information as to what kind of turbine blades and where they are use. If the blades are used on aircraft engine, the engine manufacturer will already have an inspection procedure. For blades used in the power genenration industry, either the manufacturer will have an inspection procedure or the end users (engineers) will decide on an inspection procedure.

In Power Generation, I have seen Phased Array used with excellent results on turbine blade root and I'm sure other methods are used as well.

    
 
 Reply 
 
Alisher Tadjiev
NDT Inspector
Uzbekistan Airways Technics, Uzbekistan, Joined Mar 2005, 8

Alisher Tadjiev

NDT Inspector
Uzbekistan Airways Technics,
Uzbekistan,
Joined Mar 2005
8
05:29 Jan-28-2010
Re: NDT of turbine blades.
In Reply to Azhar Jamil at 23:38 Jan-27-2010 (Opening).

Hi Azhar
I'm agree with Mr.Couture - given info not enough to final decision
What kind of engines to be inspected?
For example - aircraft Pratt&Whitney 2000/4000 engine fan blades can be inspected via two ways
(acc. manufacturer documentation - Mr.Couture told about it before) - special Eddy Current probes with Reference Standard or Liquid Penetrant Inspection (Type I, Method C, Level IV).
By the way - all turbo engine rotating parts must be inspected by Level IV sensitivity penetrant (it is concerning penetrant inspection)
In case of Rolls Roys aircaraft engines with composite fan blades - fan blades must be inspected using special RR TAPTester (actually it is not TAP Tester - looks like composite bondmaster mode tester)

Regards

    
 
 Reply 
 
azhar jamil
azhar jamil
08:40 Jan-28-2010
Re: NDT of turbine blades.
In Reply to Azhar Jamil at 23:38 Jan-27-2010 (Opening).

Thanks. The blades are of steam turbine for Power Generation industry. Phase array technique is excedllent, but the blades to be inspected after removal from rotor i.e. each blade to be inspected separately.
There is no procedure from OEM is available

If any further details required let me know.

regards

    
 
 Reply 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 847

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
847
15:38 Jan-28-2010
Re: NDT of turbine blades.
In Reply to azhar jamil at 08:40 Jan-28-2010 .

Azhar,

Since the blades are removed, phased array inspection would give better results. Their roots would be clean and you would eliminate the possibility of non-relevant indication in the root area cause by lubricant.

I guess what you can do is have some calibration pieces manufactured with artificial defects in the form of EDM notches of varying depth in the area of concern and then write your inspection procedure.

Good Luck!

    
 
 Reply 
 
aldo
Engineering
Italy, Joined Jan 2009, 39

aldo

Engineering
Italy,
Joined Jan 2009
39
15:50 Jan-28-2010
Re: NDT of turbine blades.
In Reply to Michel Couture at 15:38 Jan-28-2010 .

I speak by my exsperince in aeronautic industry in particular in maintenence activity and in production activity .. The typical NDT on blade in turbine are FPI with high sensibility (ID4) because are very critical part on engine... There are a lot applications with MPI because are sporadic case....
aldo

    
 
 Reply 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 847

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
847
04:27 Jan-29-2010
Re: NDT of turbine blades.
In Reply to aldo at 15:50 Jan-28-2010 .

Aldo,

I totally concur with you regarding aircraft turbine engine. I have as well done many FPI Level 4 on Fan Blades to detect cracking resulting from FOD (Foreign Object Damage) injestion.

I have also personally done some UT inspection of root cracking on Fan Blades of the Pratt & Whitney JT-3D which were propulsing the Boeing 707 using UT Surface Wave.

The advice Azhar is seeking is in regards to blade root inspection of turbine used in Power Generation.

    
 
 Reply 
 
Rafid O. Lopez
, NDT Level 3
Mexico, Joined Jan 2010, 79

Rafid O. Lopez

, NDT Level 3
Mexico,
Joined Jan 2010
79
16:03 Jan-30-2010
Re: NDT of turbine blades.
In Reply to Michel Couture at 04:27 Jan-29-2010 .

Hello

We work with P & W (JT8D-200), GE (CFM-56 model 5 and 7) all aircraft engines and all inspection of blades (with curved fir tree root) are with FPI some with Type 1, Method A Level 3 or Type 1, Method D Level 4.

For your inspection i think that is more easy to do an inspection with FPI.

Is a commentary.

Best regards.

Rafid

    
 
 Reply 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 847

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
847
04:15 Jan-31-2010
Re: NDT of turbine blades.
In Reply to Rafid O. Lopez at 16:03 Jan-30-2010 .

Rafid,

In a way I must agree with you. FPI is much simpler, but other methods like PAUT for exemple provide on thing FPI can't and that is a permanent record of the inspection. In my opinion, it also provide a more sensitive inspection because it is less suceptible to surface dirt. I mean, blade cleanliness is not as rigurous as FPI.

    
 
 Reply 
 

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