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- since 1996 -

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Technical Discussions
Gregory
NDT Inspector,
Poland, Joined Feb 2012, 15

Gregory

NDT Inspector,
Poland,
Joined Feb 2012
15
13:10 Feb-10-2016
Fluorescent Penetrant

I want to find out if there is required applaying dry developer in case low-sensivity fluorescent penetrant?

 
 Reply 
 
James E Scalf
NDT Inspector,
Global Integrity, Canada, Joined Oct 2012, 276

James E Scalf

NDT Inspector,
Global Integrity,
Canada,
Joined Oct 2012
276
13:48 Feb-10-2016
Re: Fluorescent Penetrant
In Reply to Gregory at 13:10 Feb-10-2016 (Opening).

Gregory,

THe requirements for whether or not you need to apply a dry or aqueous developer to low sensitivity liquid penetrant should be covered in the code or specification you are following in the examination procedure. Being that it is "Low Sensitivity" Penetrant I am going to go out on a limb and guess you are using visible dye penetrant (most likely red) in which case I would highly recomend that you apply the developer as it will provide a greater contrast in the examination area and make it easier to detect even slight amounts of dye penetrant on the surface being examined.
Hope this helps. Cheers...

 
 Reply 
 
N. B. RENGARAJU
NDT Inspector, NDT Level-III/Radiation Safety Officer(RSO)
Marine and Heavy Engineering Company, MALAYSIA., India, Joined Sep 2014, 108

N. B. RENGARAJU

NDT Inspector, NDT Level-III/Radiation Safety Officer(RSO)
Marine and Heavy Engineering Company, MALAYSIA.,
India,
Joined Sep 2014
108
02:57 Feb-11-2016
Re: Fluorescent Penetrant
In Reply to Gregory at 13:10 Feb-10-2016 (Opening).

Mr. Gregory,

As you must be aware, main function of a Developer is to draw out the penetrants trapped inside a Discontinuity by blotting action and make it visible to operator.

In that sense, its always advisable to use a Developer, what ever may be the type of penetrant.

Regards
N.B. Rengaraju

 
 Reply 
 
Andreas
NDT Inspector, Specially in the oilfield
Tuboscope Vetco(Deutschland)Gmbh, Germany, Joined Oct 1999, 131

Andreas

NDT Inspector, Specially in the oilfield
Tuboscope Vetco(Deutschland)Gmbh,
Germany,
Joined Oct 1999
131
16:40 Feb-11-2016
Re: Fluorescent Penetrant
In Reply to N. B. RENGARAJU at 02:57 Feb-11-2016 .

All is depending on the manufacturer specificon of the System.
Normally you check the with a UV lamp that all area is clean.
Then you alredy see same flaws and then you apply the developer , if required by the System see above.

Regards
Andreas

 
 Reply 
 
N. B. RENGARAJU
NDT Inspector, NDT Level-III/Radiation Safety Officer(RSO)
Marine and Heavy Engineering Company, MALAYSIA., India, Joined Sep 2014, 108

N. B. RENGARAJU

NDT Inspector, NDT Level-III/Radiation Safety Officer(RSO)
Marine and Heavy Engineering Company, MALAYSIA.,
India,
Joined Sep 2014
108
05:11 Feb-12-2016
Re: Fluorescent Penetrant
In Reply to Andreas at 16:40 Feb-11-2016 .

Dear Andreas,

Its right that you see the flaws when you check for effectiveness of excess penetrant removal step with UV light. But, as per PT norms, PT indications are supposed to be looked for after the necessary Developing time is completed.
Inspection shall start only after this. So, seeing an indication at misappropriate stages can lead to wrong judgement with respect to size and shape.
Hence, applying developer and looking for flaw would be most ideal, unless your approved PT procedure debars developing step.

Regards
N.B. Rengaraju

 
 Reply 
 

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