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Vidisco Ltd.
Vidisco Ltd. is the leading designer and manufacturer of state-of-the-art Digital Radiography systems.

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Technical Discussions
Amedeo Marino
Amedeo Marino
06:11 Jan-17-2000
ID Inspection of Preheater tubes - Reforming Plant

Dear Sirs,
we have been asked to perform an inspection of a preheater tubes in a Reforming Plant, where a leak has already been detected, and which is probably due to mechanical stress close to one of the diaphragm.
We would like to suggest the customer the following inspection:
1. 20% with MFL technique.
2. IRIS over a % of the above or on tubes presenting flaws after the MFL Inspection.
These are the Tubes details:
 Diameter. ¾”
 Thickness 2,1 mm
 Material A213 – T11 (ferritic)
 Length 19.812 mm
 Quantity 2.039

Basing on your experience, we would like to know wether the inspection proposed is correct, and if yes, how we must prepare a sample tube.
Otherways, can you please suggest us a correct inspection system for these tubes ?



    
 
 
Gilles Rousseau
Gilles Rousseau
06:49 Jan-17-2000
Re: ID Inspection of Preheater tubes - Reforming Plant
Answer:
If the suppected damage mechanism or is pitting or cracking then MFL is the best screening technique. Standard MFL probes are OK with pitting but MFL array probes are more suitable for isolated pits and cracks.

If the suppected damage mechanism is erosion, wear or corrosion, then RFT is the best screening technique.

Whatever screening technique is used, you need to confirm the nature and size of any indication found by MFL or RFT with IRIS. This is extremely important especially for defects under support plates.

If the damage is cracking, normal beam IRIS will probably be useless. Angle beam IRIS is possible with RD-Tech Digital IRIS. Possibly a video probe can give some info on through wall cracks.

If you need further information on Probes, techniques or systems, please send me an e-mail

Gilles Rousseau
Product Manager, Tube testing technology, RD-Tech


: Dear Sirs,
: we have been asked to perform an inspection of a preheater tubes in a Reforming Plant, where a leak has already been detected, and which is probably due to mechanical stress close to one of the diaphragm.
: We would like to suggest the customer the following inspection:
: 1. 20% with MFL technique.
: 2. IRIS over a % of the above or on tubes presenting flaws after the MFL Inspection.
: These are the Tubes details:
:  Diameter. ¾”
:  Thickness 2,1 mm
:  Material A213 – T11 (ferritic)
:  Length 19.812 mm
:  Quantity 2.039

: Basing on your experience, we would like to know wether the inspection proposed is correct, and if yes, how we must prepare a sample tube.
: Otherways, can you please suggest us a correct inspection system for these tubes ?



    
 
 
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
00:07 Jan-17-2000
Re: ID Inspection of Preheater tubes - Reforming Plant
Dear Amedeo Marino,

Have you considered the use of LASER in your inspection process? QUEST has supplied inspection services using the Laser-Optic Tube Inspection System (LOTIS) technology around the world in various Reforming Plants. If you want more information on the use of LASER you can visit http://www.qi2.com

Regards,
Richard D. Roberts
QUEST Integrated, Inc.
(253) 872-1275
------------ Origional Message -------------
: Dear Sirs,
: we have been asked to perform an inspection of a preheater tubes in a Reforming Plant, where a leak has already been detected, and which is probably due to mechanical stress close to one of the diaphragm.
: We would like to suggest the customer the following inspection:
: 1. 20% with MFL technique.
: 2. IRIS over a % of the above or on tubes presenting flaws after the MFL Inspection.
: These are the Tubes details:
:  Diameter. ¾”
:  Thickness 2,1 mm
:  Material A213 – T11 (ferritic)
:  Length 19.812 mm
:  Quantity 2.039

: Basing on your experience, we would like to know wether the inspection proposed is correct, and if yes, how we must prepare a sample tube.
: Otherways, can you please suggest us a correct inspection system for these tubes ?




    
 
 
James Doyle
James Doyle
00:34 Jan-25-2000
Re: ID Inspection of Preheater tubes - Reforming Plant
: Dear Amedeo Marino,

: Have you considered the use of LASER in your inspection process? QUEST has supplied inspection services using the Laser-Optic Tube Inspection System (LOTIS) technology around the world in various Reforming Plants. If you want more information on the use of LASER you can visit http://www.qi2.com

: Regards,
: Richard D. Roberts
: QUEST Integrated, Inc.
: (253) 872-1275
: ------------ Origional Message -------------
: : Dear Sirs,
: : we have been asked to perform an inspection of a preheater tubes in a Reforming Plant, where a leak has already been detected, and which is probably due to mechanical stress close to one of the diaphragm.
: : We would like to suggest the customer the following inspection:
: : 1. 20% with MFL technique.
: : 2. IRIS over a % of the above or on tubes presenting flaws after the MFL Inspection.
: : These are the Tubes details:
: : ? Diameter. ¾”
: : ? Thickness 2,1 mm
: : ? Material A213 – T11 (ferritic)
: : ? Length 19.812 mm
: : ? Quantity 2.039

: : Basing on your experience, we would like to know wether the inspection proposed is correct, and if yes, how we must prepare a sample tube.
: : Otherways, can you please suggest us a correct inspection system for these tubes ?

Dear Sir,
Northwest Research Associates alsoi build excellent laser-based NDT systems. See our web site at www.nwra.com

Good Luck, James


    
 
 

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