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Technical Discussions
Muhammad Hussain
Muhammad Hussain
15:26 Feb-01-2010
Sensitive Leakage detection

We are experiencing very minute leakage in our vertical type exchanger ( Urea Stripper) We are unable to detect the laekage, however during opertaion we know that the leakage is there ( conductivity of 35 micro siemen / cm).
We have tried Ammonia test as well as Helium leak test ( sniffer method) but without success. No of tubes is 2500 (approx)
Is there any other NDT technique to detect the leak , like radioactive tracer ( i dont much about it either)

    
 
 
Dent
Consultant, NDE Manager NDELevel III/3
NDT Consultant, Canada, Joined Nov 1998, 248

Dent

Consultant, NDE Manager NDELevel III/3
NDT Consultant,
Canada,
Joined Nov 1998
248
16:43 Feb-01-2010
Re: Sensitive Leakage detection
In Reply to Muhammad Hussain at 15:26 Feb-01-2010 (Opening).

What product is in the exchanger? What direction is it leaking? (tube to shell or shell to tube)

How did you perform the Helium sniffer test? What pressure and concentration of He? What equipment did you use? Helium testing performed properly would be the best test. Was it dry before helium testing?
Contact me by e mail and maybe I can help.

    
 
 
Tuan Dang Dinh
Tuan Dang Dinh
12:14 Feb-02-2010
Re: Sensitive Leakage detection
In Reply to Muhammad Hussain at 15:26 Feb-01-2010 (Opening).

Hello Mr. Muhammad Hussain,

It is possible to detect leak of pressure/vacuum systems by ultrasonic condition monitoring. Please refer to Sonatest Soundscan 101 at bellow link:

http://www.sonatest.com/products/multi/soundscan/Overview.html

    
 
 
Tuan Dang Dinh
Tuan Dang Dinh
12:27 Feb-02-2010
Re: Sensitive Leakage detection
In Reply to Muhammad Hussain at 15:26 Feb-01-2010 (Opening).

Hello Mr. Muhammad Hussain,

It is possible to detect leak of pressure/vacuum systems by ultrasonic condition monitoring. Please refer to Sonatest Soundscan 101 at bellow link:

http://www.sonatest.com/products/multi/soundscan/Overview.html

    
 
 
John O'Brien
Consultant, -
Chevron ETC , USA, Joined Jan 2000, 278

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
278
18:12 Feb-07-2010
Re: Sensitive Leakage detection
In Reply to Muhammad Hussain at 15:26 Feb-01-2010 (Opening).

Place pressure on the shell side and then test each tube using the Physical Acoustics 9610 potable AE instrument. We have done this numeorus times including a 3600 tube condensor its fast and worked even when we could not find the leak by other methods.

    
 
 

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