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- since 1996 -

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Technical Discussions
Nguyen Tuan
NDT Inspector
Vietnam, Joined Apr 2006, 1

Nguyen Tuan

NDT Inspector
Vietnam,
Joined Apr 2006
1
02:01 Apr-11-2006
Need a flaw detector for NDT inspection of ship propeller

Hi all,

Our company manufacture ship propellers. Propellers ard made from Cu alloy by die casting. Thickness of wing propeller from 3cm to 20 cm. We want to inspection flaws such as porosity. We have use Ultasonic flaw detector to inspection but it was so slow. UT method only inspection with less than 4cm areas only.

We are looking to buy a Flaw detector can detect flaws such above application with high speed inspection.

Please kindly show me which method is suitable with our application?

Looking forward to hearing from you soon


    
 
 
Ed
Ed
03:46 Apr-12-2006
Re: Need a flaw detector for NDT inspection of ship propeller
----------- Start Original Message -----------
: Hi all,
: Our company manufacture ship propellers. Propellers ard made from Cu alloy by die casting. Thickness of wing propeller from 3cm to 20 cm. We want to inspection flaws such as porosity. We have use Ultasonic flaw detector to inspection but it was so slow. UT method only inspection with less than 4cm areas only.
: We are looking to buy a Flaw detector can detect flaws such above application with high speed inspection.
: Please kindly show me which method is suitable with our application?
: Looking forward to hearing from you soon
------------ End Original Message ------------

Why don't you try X-Ray?



    
 
 
Jukka Hakala
Director, NDT-Advisor EN Level 3
NDT-Team Oy, Finland, Joined Oct 2004, 7

Jukka Hakala

Director, NDT-Advisor EN Level 3
NDT-Team Oy,
Finland,
Joined Oct 2004
7
07:01 Apr-13-2006
Re: Need a flaw detector for NDT inspection of ship propeller
----------- Start Original Message -----------
: : Hi all,
: : Our company manufacture ship propellers. Propellers ard made from Cu alloy by die casting. Thickness of wing propeller from 3cm to 20 cm. We want to inspection flaws such as porosity. We have use Ultasonic flaw detector to inspection but it was so slow. UT method only inspection with less than 4cm areas only.
: : We are looking to buy a Flaw detector can detect flaws such above application with high speed inspection.
: : Please kindly show me which method is suitable with our application?
: : Looking forward to hearing from you soon
: Why don't you try X-Ray?
------------ End Original Message ------------

If the geometry is suitable I suggest x-ray imaging with using digital flat panel. Exposuring time is short and you can analyse the image directly from computer screen.


    
 
 
Rizwan S Choudhry
Student, PhD
The University of Manchester, United Kingdom, Joined Jun 2005, 1

Rizwan S Choudhry

Student, PhD
The University of Manchester,
United Kingdom,
Joined Jun 2005
1
00:27 Apr-13-2006
Re: Need a flaw detector for NDT inspection of ship propeller
peace & blessings
X-ray Tomography can be good but depending on the level of information you require the time can vary from few mins to few hours.
I suggest you should look at the following links for further info
1. Chapter4 of the report which u can download from
http://www.geocities.com/rizwan_saeed/Abstract.html

just scroll to the bottom of the page to get a link to report.
2. Stock, S.R., X-ray microtomography of materials. Int Mater Rev, 1999. 44(4):p. 141– 164.

rizwan

----------- Start Original Message -----------
: : : Hi all,
: : : Our company manufacture ship propellers. Propellers ard made from Cu alloy by die casting. Thickness of wing propeller from 3cm to 20 cm. We want to inspection flaws such as porosity. We have use Ultasonic flaw detector to inspection but it was so slow. UT method only inspection with less than 4cm areas only.
: : : We are looking to buy a Flaw detector can detect flaws such above application with high speed inspection.
: : : Please kindly show me which method is suitable with our application?
: : : Looking forward to hearing from you soon
: : Why don't you try X-Ray?
: If the geometry is suitable I suggest x-ray imaging with using digital flat panel. Exposuring time is short and you can analyse the image directly from computer screen.
------------ End Original Message ------------




    
 
 
Grzegorz Latarowski
Grzegorz Latarowski
00:53 Apr-13-2006
Re: Need a flaw detector for NDT inspection of ship propeller
Hi Nguyen,

I suggest You to contact our company directly if You want a specialized application. Our company is manufacturing Ultrasonic Flaw Detector with specialized equipments such as ultrasonic scanners and also specialized investigating methods.

Please don't hesitate ask further questions through my email.

We can prepare a special offer for a discussion.

Best regards,
Grzegorz Latarowski
gl.ultrasonic@home.pl
http://ultrasonic.home.pl/

----------- Start Original Message -----------
: Hi all,
: Our company manufacture ship propellers. Propellers ard made from Cu alloy by die casting. Thickness of wing propeller from 3cm to 20 cm. We want to inspection flaws such as porosity. We have use Ultasonic flaw detector to inspection but it was so slow. UT method only inspection with less than 4cm areas only.
: We are looking to buy a Flaw detector can detect flaws such above application with high speed inspection.
: Please kindly show me which method is suitable with our application?
: Looking forward to hearing from you soon
------------ End Original Message ------------




    
 
 
Norman A. Woodward
Norman A. Woodward
04:19 Apr-13-2006
Re: Need a flaw detector for NDT inspection of ship propeller
----------- Start Original Message -----------
: peace & blessings
: X-ray Tomography can be good but depending on the level of information you require the time can vary from few mins to few hours.
: I suggest you should look at the following links for further info
: 1. Chapter4 of the report which u can download from
: http://www.geocities.com/rizwan_saeed/Abstract.html
: just scroll to the bottom of the page to get a link to report.
: 2. Stock, S.R., X-ray microtomography of materials. Int Mater Rev, 1999. 44(4):p. 141– 164.
: rizwan
: : : : Hi all,
: : : : Our company manufacture ship propellers. Propellers ard made from Cu alloy by die casting. Thickness of wing propeller from 3cm to 20 cm. We want to inspection flaws such as porosity. We have use Ultasonic flaw detector to inspection but it was so slow. UT method only inspection with less than 4cm areas only.
: : : : We are looking to buy a Flaw detector can detect flaws such above application with high speed inspection.
: : : : Please kindly show me which method is suitable with our application?
: : : : Looking forward to hearing from you soon
: : : Why don't you try X-Ray?
: : If the geometry is suitable I suggest x-ray imaging with using digital flat panel. Exposuring time is short and you can analyse the image directly from computer screen.
------------ End Original Message ------------

Radiography would be your best bet, but shooting through 20cm of Cu will require at least a 2 Mev apparatus or a Co source. This will involve, besides the cost of new equipment, the moving the part to a highly shielded/isolated location.

The good news is that using the mentioned digital flat panels, or computed radiography plates, should give you adequate sensitivity at relatively short exposure time, in comparison to film, and at a fraction of the cost.


    
 
 

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