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Ranjeet singh_tcl
Joined: 22 May 2006
Posts: 2
Location: India
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 Posted: Tue May 23, 2006 9:27 pm Post subject: Variance in ECT results during tube inspection of stripper |
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We are operating Fertilizer plant at India.During Annual Turn-round 2006 one of our vertical exchanger stripper's tubes were inspected by using eddy current test .
: Details of heat exchanger is as follows,
: Falling film type vertical heat exchanger
: Media in the tube-Ammonium carbamate
: Materail of tube-Titanium gr-3
: Results of eddy current were very surprising as it was found more than 60% gradual wall loss in more than 25% tube.Management had started thinking about its replacement in the coming year.As it was surprsing that after 10 year of operation results were such.But then it was decided to pull ot one of the tube to check ECT worthiness.
: After pull out it was inspected from inside/outside and pieces were cut to measure its bore using bore gauge.Measurement showed that reduction is not more than 40%.
: Also its wall thickness was measured using ultrasonic thickness gauge,whcih also confirmed the bore gauge results.
: Calibartion tube and its artificail flaws were made as ASME section-V.
: ECT instrument was confirming the calibartion tube but not exchanger tube.
: I would like to no possible reasons,which caused such deviation.
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