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Technical Discussions
Amedeo Marino
Amedeo Marino
04:57 May-25-2000
Inspection of a Platforming Plant Heat Exchanger

we have beenasked to perform the following testing:

Vertical Heat Exchanger
Tube Length 21 m
Tube Diameter 3/4"
Tube Material T11
Number of tubes 1885
The heat exchanger has been out of service for the last 5 years.
Which is the best inspection to suggest the customer ?
Is it OK Remote Field or MFL for flaw detection and IRIS for flaw carachterization ?
Will the verticality of the item affect the performance of the inspection ?

I would be very gratefull for your help.

Best Regards.



    
 
 
Amedeo Marino
Amedeo Marino
05:03 May-26-2000
Re: Inspection of a Platforming Plant Heat Exchanger
st 5 years.
: Which is the best inspection to suggest the customer ?
: Is it OK Remote Field or MFL for flaw detection and IRIS for flaw carachterization ?
: Will the verticality of the item affect the performance of the inspection ?

: I would be very gratefull for your help.

: Best Regards.




    
 
 
Richard D. Roberts
Engineering, Executive Managment
Quest Integrity Group, USA, Joined Nov 1998, 78

Richard D. Roberts

Engineering, Executive Managment
Quest Integrity Group,
USA,
Joined Nov 1998
78
06:12 May-26-2000
Re: Inspection of a Platforming Plant Heat Exchanger



    
 
 
Richard D. Roberts
Engineering, Executive Managment
Quest Integrity Group, USA, Joined Nov 1998, 78

Richard D. Roberts

Engineering, Executive Managment
Quest Integrity Group,
USA,
Joined Nov 1998
78
06:30 May-26-2000
Re: Inspection of a Platforming Plant Heat Exchanger
Dear Amedeo Marino,

Have you considered using “LASER” to inspect your tubes? QUEST designed a “laser” based tube inspection system for the US Navy in 1985 which has many advantages over other conventional NDT inspection methods. Of course there are also limitations such as any method. What type of defects or damage you are attempting to detect and quantify should be the deciding factor when selecting a testing method.

The advantages that the “LASER” method has are:
a) Very High accuracy: +/-0.025mm (0.001”)
b) Inspection Speed: 77mm (3”) per second
c) Does NOT require water or any other type of couplant
d) Set-up and calibration time takes less than 15 minutes
e) Different material types have NO EFFECT on the data quality or accuracy
f) Can inspect “vertical” or “horizontal” tubes with no problem

You may even want to consider this technology as a compliment to the Eddy Current (ET) or Magnetic Flux Leakage (MFL) technique. The very high resolution capabilities can generate highresolution pictures of any flaw located on the ID surface.

If you would like additional information please contact me at:
Richard D. Roberts
QUEST Integrated, Inc.
Tel: (253) 872-1275
Fax: (253) 872-8967
http://www.qi2.com/field/fsddef.htm



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

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
278
07:08 May-26-2000
Re: Inspection of a Platforming Plant Heat Exchanger
This is a common problem. Obviously searching for areas of damage with RFEC or MFL is a good fast screening then proving up the most significant areas of damage with IRIS will give you the most detailed condition of the exchanger. Vertical exchangers do pose problems with IRIS. In the past when I have done these the best way is to plug the bottom of the tubes and then fill them so you have a static coloumn of water to work in with the IRIS. Some people use rubber bungs or corks. With the length and diameter of your tubes you will have a fair weight so I would use expanding sealing plugs. Most refinery maintenance shops should have these they are selectable based on diameter, rubber sealing rings with a central screw expander. These give a tight fit and will hold the water coloumn. Be aware it can be tricky and slow as it is not uncommon to lose the plugs at an inopportune moment. Depending on how many plugs are available you may find that you inspect as little as two tubes an hour. Sometimes as well it is difficult to obtain and maintain a good IRIS Sine Wave although in a 3/4" tube this should be OK. If this is a concern you may want to consider the Tubescan approach which does not depend upon a water driven turbine. You can find data on that technique at Scanning Systemms International.

Regards

John O'Brien


    
 
 
Doug Breeze
Director, Consultant; R&D
Inspection Software Limited, United Kingdom, Joined May 2000, 20

Doug Breeze

Director, Consultant; R&D
Inspection Software Limited,
United Kingdom,
Joined May 2000
20
07:56 May-27-2000
Re: Inspection of a Platforming Plant Heat Exchanger
Whatever method(s) you adopt you may wish to consider
Tube Sheet Diagram for reporting the results.

TSD accepts data from any method, in multiple layers...
EC, RFEC, IRIS, QUASER, UT, CCTV, FerroScope, DinSearch,
material, tube replacements, etc.

Demo (PowerPoint) available at the website; brochure
and samples on request. TSD16 runs on Win 3.1, Win 9x,
& Win NT.

Details at http://www.inspection.co.uk/ds_tsd0.htm


    
 
 
Ingo Becker
Engineering, NDT Inspector & Sales
ec-works GmbH, Germany, Joined Apr 2000, 29

Ingo Becker

Engineering, NDT Inspector & Sales
ec-works GmbH,
Germany,
Joined Apr 2000
29
08:37 Jun-08-2000
Re: Inspection of a Platforming Plant Heat Exchanger
hallo

if there is a need to test all exchanger tubes in a short period of time, you should think about a EC test of the tubes.

A complete test of all tubes may take only some days and after the test you have detailed informations about every tube and a special report with a tube sheet plan and other informations.

For more informations contact me or visit our webside under www.deltatest.de

best regards

ingo becker


    
 
 

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