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Technical Discussions
krish
krish
09:27 Oct-11-2006
profile radiography

In one of the process unit the Transfer line between reactor to column (FCCU) got thinned out and leaked at the T-Joint weld portion due to erosion and the same was clamped.Is there any on-line method to assess the healthiness of remaining portion of the line?.
Line operating temperature is 420 Deg.C
Operating pressure is : 2.5 kg/sq.cm
Line size is 24" (Low alloy P11 Material 1 1/4 Cr- 0.5 Mo).
Pipeline wall thickness is 12 mm
Will gamma ray scanning/real time radiography can be done to check the remaining wall thikness at the eroded portion?
OR
Any other mehod is available?regards,





 
 Reply 
 
S.V.Swamy
Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex , India, Joined Feb 2001, 787

S.V.Swamy

Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex ,
India,
Joined Feb 2001
787
07:34 Oct-11-2006
Re: profile radiography
Dear Krish,

You can think of Infra Red Thermography to scan the pipe surface and see for the hotspots. The thinner the wall, the higher the surface temperature. By calibrating the pipe wall at a few places (measure the wall thickness by a high temperature ultrasonic wall thickness probe and check the surface temperature there), it should be possible to survey the whole pipe surface.

Swamy

----------- Start Original Message -----------
: In one of the process unit the Transfer line between reactor to column (FCCU) got thinned out and leaked at the T-Joint weld portion due to erosion and the same was clamped.Is there any on-line method to assess the healthiness of remaining portion of the line?.
: Line operating temperature is 420 Deg.C
: Operating pressure is : 2.5 kg/sq.cm
: Line size is 24" (Low alloy P11 Material 1 1/4 Cr- 0.5 Mo).
: Pipeline wall thickness is 12 mm
: Will gamma ray scanning/real time radiography can be done to check the remaining wall thikness at the eroded portion?
: OR
: Any other mehod is available?regards,
------------ End Original Message ------------




 
 Reply 
 
Nigel
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
05:20 Oct-13-2006
Re: profile radiography

krish

Are you wanting to check both the T-joint weld for weld root erosion and the rest of the line for general corrosion?

Profile radiography with a high precision comparator block such as the Ricky T is considered useful for spot remaining wall thickness under insulation up to 10 inch diameter.

Follow this link (or cut-and-paste in your browser) for other CUI techniques:

http://www.asnt.org/publications/Materialseval/basics/feb97basics/feb97basics.htm

With both the clamp and the geometry it sounds difficult for radiography to detect the remaining wall thickness at the leak site.

----------- Start Original Message -----------
: In one of the process unit the Transfer line between reactor to column (FCCU) got thinned out and leaked at the T-Joint weld portion due to erosion and the same was clamped.Is there any on-line method to assess the healthiness of remaining portion of the line?.
: Line operating temperature is 420 Deg.C
: Operating pressure is : 2.5 kg/sq.cm
: Line size is 24" (Low alloy P11 Material 1 1/4 Cr- 0.5 Mo).
: Pipeline wall thickness is 12 mm
: Will gamma ray scanning/real time radiography can be done to check the remaining wall thikness at the eroded portion?
: OR
: Any other mehod is available?regards,
------------ End Original Message ------------




 
 Reply 
 
krish
krish
04:14 Oct-17-2006
Re: profile radiography
Dear swamy,
Thanks for the information.The problem is the external insulation is very much needed for operating point of view and also the line temperature is around 420 Deg.C.Removing insulation is a big task.
regards,

----------- Start Original Message -----------
: Dear Krish,
: You can think of Infra Red Thermography to scan the pipe surface and see for the hotspots. The thinner the wall, the higher the surface temperature. By calibrating the pipe wall at a few places (measure the wall thickness by a high temperature ultrasonic wall thickness probe and check the surface temperature there), it should be possible to survey the whole pipe surface.
: Swamy
: : In one of the process unit the Transfer line between reactor to column (FCCU) got thinned out and leaked at the T-Joint weld portion due to erosion and the same was clamped.Is there any on-line method to assess the healthiness of remaining portion of the line?.
: : Line operating temperature is 420 Deg.C
: : Operating pressure is : 2.5 kg/sq.cm
: : Line size is 24" (Low alloy P11 Material 1 1/4 Cr- 0.5 Mo).
: : Pipeline wall thickness is 12 mm
: : Will gamma ray scanning/real time radiography can be done to check the remaining wall thikness at the eroded portion?
: : OR
: : Any other mehod is available?regards,
------------ End Original Message ------------




 
 Reply 
 
To Whom itconcerns
To Whom itconcerns
01:37 Oct-18-2006
Re: profile radiography
try guided wave UT

----------- Start Original Message -----------
: Dear swamy,
: Thanks for the information.The problem is the external insulation is very much needed for operating point of view and also the line temperature is around 420 Deg.C.Removing insulation is a big task.
: regards,
: : Dear Krish,
: : You can think of Infra Red Thermography to scan the pipe surface and see for the hotspots. The thinner the wall, the higher the surface temperature. By calibrating the pipe wall at a few places (measure the wall thickness by a high temperature ultrasonic wall thickness probe and check the surface temperature there), it should be possible to survey the whole pipe surface.
: : Swamy
: : : In one of the process unit the Transfer line between reactor to column (FCCU) got thinned out and leaked at the T-Joint weld portion due to erosion and the same was clamped.Is there any on-line method to assess the healthiness of remaining portion of the line?.
: : : Line operating temperature is 420 Deg.C
: : : Operating pressure is : 2.5 kg/sq.cm
: : : Line size is 24" (Low alloy P11 Material 1 1/4 Cr- 0.5 Mo).
: : : Pipeline wall thickness is 12 mm
: : : Will gamma ray scanning/real time radiography can be done to check the remaining wall thikness at the eroded portion?
: : : OR
: : : Any other mehod is available?regards,
------------ End Original Message ------------




 
 Reply 
 
Jim Kovarik
Engineering
Lixi, Inc., USA, Joined Nov 1998, 39

Jim Kovarik

Engineering
Lixi, Inc.,
USA,
Joined Nov 1998
39
05:35 Oct-18-2006
Re: profile radiography
Dear Krish,

The Lixi Profiler may work with some modification to the arm size. A new source is capable of penetrating nearly 2 inches of steel equivalent density. Two items are of concern: 1) the density of the product in the line, and 2) the clamp you mentioned. I doubt very much that the device will penterate the clamp and pipe wall thickness, however, it may suffice for other sections of the line.

----------- Start Original Message -----------
: In one of the process unit the Transfer line between reactor to column (FCCU) got thinned out and leaked at the T-Joint weld portion due to erosion and the same was clamped.Is there any on-line method to assess the healthiness of remaining portion of the line?.
: Line operating temperature is 420 Deg.C
: Operating pressure is : 2.5 kg/sq.cm
: Line size is 24" (Low alloy P11 Material 1 1/4 Cr- 0.5 Mo).
: Pipeline wall thickness is 12 mm
: Will gamma ray scanning/real time radiography can be done to check the remaining wall thikness at the eroded portion?
: OR
: Any other mehod is available?regards,
------------ End Original Message ------------




 
 Reply 
 
N.Kuppusamy
Consultant, Level-III
United Testing Co. Pte Ltd, Singapore, Joined Jan 2003, 13

N.Kuppusamy

Consultant, Level-III
United Testing Co. Pte Ltd,
Singapore,
Joined Jan 2003
13
08:40 Oct-19-2006
Re: profile radiography
Dear friend,

How do you come to the conclusion that the leakage was due to erosion.

Leakages can be caused by through wall defects such as pinholes, cracks and combination of defects which forms fine passage under high pressure and elevated temperature.

Regards,
N.Kuppusamy

----------- Start Original Message -----------
:
: krish
: Are you wanting to check both the T-joint weld for weld root erosion and the rest of the line for general corrosion?
: Profile radiography with a high precision comparator block such as the Ricky T is considered useful for spot remaining wall thickness under insulation up to 10 inch diameter.
: Follow this link (or cut-and-paste in your browser) for other CUI techniques:
: http://www.asnt.org/publications/Materialseval/basics/feb97basics/feb97basics.htm
: With both the clamp and the geometry it sounds difficult for radiography to detect the remaining wall thickness at the leak site.
: : In one of the process unit the Transfer line between reactor to column (FCCU) got thinned out and leaked at the T-Joint weld portion due to erosion and the same was clamped.Is there any on-line method to assess the healthiness of remaining portion of the line?.
: : Line operating temperature is 420 Deg.C
: : Operating pressure is : 2.5 kg/sq.cm
: : Line size is 24" (Low alloy P11 Material 1 1/4 Cr- 0.5 Mo).
: : Pipeline wall thickness is 12 mm
: : Will gamma ray scanning/real time radiography can be done to check the remaining wall thikness at the eroded portion?
: : OR
: : Any other mehod is available?regards,
------------ End Original Message ------------




 
 Reply 
 

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