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763 views
02:32 Feb-21-2008
balwinder singh
UT OF POWER PIPING

DEAR EXPERTS,

WE AHD COMPLETED A JOB WITH RT,NOW CLIENT ASKING FOR UT AT SITE &IF ANY FLAW FOUND THEY WANT TO RECTIFY AT OUR COST.

BUT AS PER MY EXPERIENCE I THINK THAT RT &UT RESULTS WILL NOT BE MATCH.

WILL YOU PLEASE EXPLAIN WHY?


 
04:46 Feb-21-2008

bob sudharmin

Engineering, Reliability and Integrity Eng
Shell Malaysia Trading,
Malaysia,
Joined Jan 2008
54
Re: UT OF POWER PIPING Flaws or cracks perpendicular to the surface cannot be detected by radiography, hence the follow up with ultrasonics flaw detection technique.

----------- Start Original Message -----------
: DEAR EXPERTS,
: WE AHD COMPLETED A JOB WITH RT,NOW CLIENT ASKING FOR UT AT SITE &IF ANY FLAW FOUND THEY WANT TO RECTIFY AT OUR COST.
: BUT AS PER MY EXPERIENCE I THINK THAT RT &UT RESULTS WILL NOT BE MATCH.
: WILL YOU PLEASE EXPLAIN WHY?
------------ End Original Message ------------




 
05:16 Feb-21-2008
Ed T
Re: UT OF POWER PIPING Bob, I think you mean flaws or crack parrallel to the surface cannot be detected. Indications perpendicular to the surface are ideal for detection with RT and UT angle beam.
I dont really understand what your client is telling you. UT will probably show the flaws to be longer than RT would have. If your contract called for RT , then that is the acceptance criteria you have to go by. If they want to change the contract they should give you a change order and be prepared to pay for it.
----------- Start Original Message -----------
: Flaws or cracks perpendicular to the surface cannot be detected by radiography, hence the follow up with ultrasonics flaw detection technique.
: : DEAR EXPERTS,
: : WE AHD COMPLETED A JOB WITH RT,NOW CLIENT ASKING FOR UT AT SITE &IF ANY FLAW FOUND THEY WANT TO RECTIFY AT OUR COST.
: : BUT AS PER MY EXPERIENCE I THINK THAT RT &UT RESULTS WILL NOT BE MATCH.
: : WILL YOU PLEASE EXPLAIN WHY?
------------ End Original Message ------------




 
04:25 Feb-22-2008

bob sudharmin

Engineering, Reliability and Integrity Eng
Shell Malaysia Trading,
Malaysia,
Joined Jan 2008
54
Re: UT OF POWER PIPING My sincere apologies for the slip up. Yes, you are right.
What I actually meant was, flaws or cracks parallel to the surface cannot be detected by radiography, hence the follow up with UT.

----------- Start Original Message -----------
: Bob, I think you mean flaws or crack parrallel to the surface cannot be detected. Indications perpendicular to the surface are ideal for detection with RT and UT angle beam.
: I dont really understand what your client is telling you. UT will probably show the flaws to be longer than RT would have. If your contract called for RT , then that is the acceptance criteria you have to go by. If they want to change the contract they should give you a change order and be prepared to pay for it.
: : Flaws or cracks perpendicular to the surface cannot be detected by radiography, hence the follow up with ultrasonics flaw detection technique.
: : : DEAR EXPERTS,
: : : WE AHD COMPLETED A JOB WITH RT,NOW CLIENT ASKING FOR UT AT SITE &IF ANY FLAW FOUND THEY WANT TO RECTIFY AT OUR COST.
: : : BUT AS PER MY EXPERIENCE I THINK THAT RT &UT RESULTS WILL NOT BE MATCH.
: : : WILL YOU PLEASE EXPLAIN WHY?
------------ End Original Message ------------




 
07:10 Feb-22-2008
theo micottis
Re: UT OF POWER PIPING May be it was a misunderstanding about parallel and perpendicular.Cracks can be detected if they are parallel to the radiation beam so this means perpendicular to the surface


 
04:45 Feb-25-2008

collin maloney

NDT Inspector, - Plant Inspector
Applus RTD,
Australia,
Joined Nov 2000
147
Re: UT OF POWER PIPING ----------- Start Original Message -----------
: DEAR EXPERTS,
: WE AHD COMPLETED A JOB WITH RT,NOW CLIENT ASKING FOR UT AT SITE &IF ANY FLAW FOUND THEY WANT TO RECTIFY AT OUR COST.
: BUT AS PER MY EXPERIENCE I THINK THAT RT &UT RESULTS WILL NOT BE MATCH.
: WILL YOU PLEASE EXPLAIN WHY?
------------ End Original Message ------------

I think that I'm missing something here! is it not the clients responsibility to specify the inspection technique! Was there a client spec requireing both UT & RT?
Did the client approve the inspection procedures etc etc.
I cant see how you are responsible for the quality of the welding unless you did that too!



 


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