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Technical Discussions
Humberto Figueroa
Consultant
PDVSA-Intevep, Venezuela, Joined Apr 2001, 1

Humberto Figueroa

Consultant
PDVSA-Intevep,
Venezuela,
Joined Apr 2001
1
04:55 Apr-04-2001
ammonia converter inspection

We have an ammonia converter which consists of a multilayer
shell welded circumferentially to carbon steel top and bottom
heads. The number od layes is appx 10, each 1/4 " thick.
We are concerned of possible damage in one of the layers.
Does anyone know of an efficient NDT method to inspect the
multilayer shell? Our main concern is in the area near the
shell heads welds. We would like to know if anyone has
experience using acoustic emission as a volume inspection in
one of these converters. We have thought of AE since there are
many hard to reach areas employing other techniques such as UT.
However, we fear that the noise generated by
the friction between layers while pressurizing the vessel
may mask the real signal. Also, I would be interested in hearing
of any experience with these components related either with NDT
or with failure mechanisms

Thank you



    
 
 Reply 
 
Brian Shannon
Brian Shannon
00:05 Apr-04-2001
Re: ammonia converter inspection
: We have an ammonia converter which consists of a multilayer
: shell welded circumferentially to carbon steel top and bottom
: heads. The number od layes is appx 10, each 1/4 " thick.
: We are concerned of possible damage in one of the layers.
: Does anyone know of an efficient NDT method to inspect the
: multilayer shell? Our main concern is in the area near the
: shell heads welds. We would like to know if anyone has
: experience using acoustic emission as a volume inspection in
: one of these converters. We have thought of AE since there are
: many hard to reach areas employing other techniques such as UT.
: However, we fear that the noise generated by
: the friction between layers while pressurizing the vessel
: may mask the real signal. Also, I would be interested in hearing
: of any experience with these components related either with NDT
: or with failure mechanisms
.
: Thank you
:
.The ability to examine multi-layer reactor vessels including head to shell and shell to shell welds has been proven through lab and field trials. Field inspections on a variety of ammonia and urea reactors with the same weld configurations have been carried out. The methods employed are TOFD. For further details contact me at the above address.



    
 
 Reply 
 
Jan Verkooijen
Director,
Sonovation, Netherlands, Joined Nov 1998, 29

Jan Verkooijen

Director,
Sonovation,
Netherlands,
Joined Nov 1998
29
09:02 Apr-05-2001
Re: ammonia converter inspection
: We have an ammonia converter which consists of a multilayer
: shell welded circumferentially to carbon steel top and bottom
: heads. The number od layes is appx 10, each 1/4 " thick.
: We are concerned of possible damage in one of the layers.
: Does anyone know of an efficient NDT method to inspect the
: multilayer shell? Our main concern is in the area near the
: shell heads welds. We would like to know if anyone has
: experience using acoustic emission as a volume inspection in
: one of these converters. We have thought of AE since there are
: many hard to reach areas employing other techniques such as UT.
: However, we fear that the noise generated by
: the friction between layers while pressurizing the vessel
: may mask the real signal. Also, I would be interested in hearing
: of any experience with these components related either with NDT
: or with failure mechanisms
.
: Thank you
:
Dear Humberto,
We have been involvedin inspection of multi layer welds
both multilayer to multilayer and multilayer to solid
during in-service and fabrication inspection for some time
now. At the moment we are working on a fairly large
fabrication project including this type of weld.
We have also done validations successfully.
I can be contacted on the above e-mail address.

Best regards,

Jan Verkooijen



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

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
278
02:57 Apr-24-2001
Re: ammonia converter inspection
AE has worked well on these vessels here in Europe. Once the pressure gets above say 70% of operating the layers act as one and any noise from layers rubbing is eliminated.

Best approach is an overpressure test and then monitor during a cooldown. This provided good results. then follow up indication areas with automated UT.

Best scenario is AE followed by Automated UT gived highest POD and POS.

If you need more detail please contact me direct
.



    
 
 Reply 
 

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