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Technical Discussions
balwinder singh
balwinder singh
02:32 Feb-21-2008
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?


 
 Reply 
 
bob sudharmin
Engineering, Reliability and Integrity Eng
Shell Malaysia Trading, Malaysia, Joined Jan 2008, 54

bob sudharmin

Engineering, Reliability and Integrity Eng
Shell Malaysia Trading,
Malaysia,
Joined Jan 2008
54
04:46 Feb-21-2008
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 ------------




 
 Reply 
 
Ed T
Ed T
05:16 Feb-21-2008
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 ------------




 
 Reply 
 
bob sudharmin
Engineering, Reliability and Integrity Eng
Shell Malaysia Trading, Malaysia, Joined Jan 2008, 54

bob sudharmin

Engineering, Reliability and Integrity Eng
Shell Malaysia Trading,
Malaysia,
Joined Jan 2008
54
04:25 Feb-22-2008
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 ------------




 
 Reply 
 
theo micottis
theo micottis
07:10 Feb-22-2008
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


 
 Reply 
 
collin maloney
NDT Inspector, - Plant Inspector
Applus RTD, Australia, Joined Nov 2000, 147

collin maloney

NDT Inspector, - Plant Inspector
Applus RTD,
Australia,
Joined Nov 2000
147
04:45 Feb-25-2008
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!



 
 Reply 
 

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