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- since 1996 -
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Technical Discussions
ASHWANI KUMAR
Engineering,
MIDHANI, Hyderabad, India, Joined Jun 2015, 96

ASHWANI KUMAR

Engineering,
MIDHANI, Hyderabad,
India,
Joined Jun 2015
96
07:49 Jul-11-2015
Film Density in RT

We are carrying out RT of complex super alloy castings for aerospace application. Our client is insisting for the density of 2.00 to 2.80 in the radiographs,but the standards permit to have the density of 1.50 to 4.00 (if the density is readable). Is the customer justified to limit the density to 2.00 to 2.80 in Radiographs of highly complex castings, where the thickness is in the range of 3.00 mm to 50.00 mm?

ashwani kumar
head- inspection,
midhani,
hyderabad, india
cell no. +918978885187

 
 Reply 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 869

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
869
14:15 Jul-11-2015
Re: Film Density in RT
In Reply to ASHWANI KUMAR at 07:49 Jul-11-2015 (Opening).

Ashwani,

I understand that you have a code to work with, but in my opinion a customer has the right to ask for a higher quality than what the code calls for. In your case a smaller range of density. If he wanted the job to be done according to code and ask you to accept radiograph below 1.5 and above 4 in density, then you would have the right to refuse, but in your present situation, you are still within code, just stricter.

1
 
 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
17:35 Jul-11-2015
Re: Film Density in RT
In Reply to ASHWANI KUMAR at 07:49 Jul-11-2015 (Opening).

Client has the right to specify tighter standards than what are specified in code. We were insisting on x-ray radiography of pressure vessel welds though the code was allowing use of either x-ray or gamma rays - we were ready to pay more for the vessel but did not budge on that aspect....some vendors refused and were thus screened out....

So, your client has the right....unless this is a change in the specification after the contract has been signed....

1
 
 Reply 
 
Dr. Uwe Zscherpel
Director,
BAM Berlin, Germany, Joined Jan 2010, 83

Dr. Uwe Zscherpel

Director,
BAM Berlin,
Germany,
Joined Jan 2010
83
11:03 Jul-13-2015
Re: Film Density in RT
In Reply to S V Swamy at 17:35 Jul-11-2015 .

Dear Ashwani,

a density limit of 2 2. This makes great sense, because this ensures a minimum flaw sensitivity (contrast sensitivity) of your radiograph. If you use a modern illuminator based on LEDs than a Dmax of D>4 is reached easily. A Dmax of 2.8 means that you can use a cheap light box from medical field, which should not be used in Aerospace applications at all! It is not understandable why industrial radiography is spoiled by a minimum Dmax of 2.8.

Best regards
Uwe Z.

 
 Reply 
 
Stan
NDT Inspector,
Canada, Joined Jan 2009, 31

Stan

NDT Inspector,
Canada,
Joined Jan 2009
31
18:25 Jul-13-2015
Re: Film Density in RT
In Reply to ASHWANI KUMAR at 07:49 Jul-11-2015 (Opening).

Ashwani
It will depend on the contract between you and your client. If the contract says radiography to code requirements, then the requirements of the code apply. If they come back and are asking for extras, then you should have the right to charge the extra time for the extra shots needed to meet their requirements. If the original contract required you to meet their requirements, and these density limits were stated, then you are stuck meeting their requirements.
Regards
Stan

 
 Reply 
 
jaimin patel
NDT Inspector, NDT LeveL-III @ UIC, KSA
Saudi Arabia, Joined Dec 2012, 100

jaimin patel

NDT Inspector, NDT LeveL-III @ UIC, KSA
Saudi Arabia,
Joined Dec 2012
100
09:13 Jul-20-2015
Re: Film Density in RT
In Reply to ASHWANI KUMAR at 07:49 Jul-11-2015 (Opening).

ashwini kumar,

Please confirm your purchase order/documents,

is it specified to do according to asme sec v article 2 or customer given itp ?

Then,it is very easy to say that we need extra cost with extra time for specified density limit.

 
 Reply 
 
M.Emami
NDT Inspector, welding engineer
gas refinery, Iran, Joined Mar 2014, 7

M.Emami

NDT Inspector, welding engineer
gas refinery,
Iran,
Joined Mar 2014
7
08:42 Jul-24-2015
Re: Film Density in RT
In Reply to ASHWANI KUMAR at 07:49 Jul-11-2015 (Opening).

Ashwani,

I agree with the Stan . You must have written all the requirements in the procedure,applicable code or written contract . So all unreasonable demands out of it is not acceptable and Require the consent of both parties
best regards

 
 Reply 
 

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