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- since 1996 -

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Technical Discussions
RP Bhan
Engineering,
HPCL Refinery, India, Joined Jul 2003, 11

RP Bhan

Engineering,
HPCL Refinery,
India,
Joined Jul 2003
11
09:50 Mar-01-2007
NDE technique

I will like to have experts opinion on following :
We have a Column in vacuum service in Refinery . Column bottom section has been provided with SS strip lining over CS base material for corrosion protection . This striplining has tendency to bulge & develops crack in service . We have observed severe corrosion of CS base material under striplining at some locations . We want to ensure integrity of base material .Is there a technique available which will allow us to find out these affected /corroded/grooved locations without removal of strips .-can be from outside on run or from inside during the shutdown of unit . Column operates at about 400deg C .
Thanks .



 
 Reply 
 
C Truskolasky
Test Examiner Mil-2132, Level III
Lehigh Heavy Forge, USA, Joined Jan 2007, 10

C Truskolasky

Test Examiner Mil-2132, Level III
Lehigh Heavy Forge,
USA,
Joined Jan 2007
10
05:18 Mar-02-2007
Re: NDE technique
----------- Start Original Message -----------
: I will like to have experts opinion on following :
: We have a Column in vacuum service in Refinery . Column bottom section has been provided with SS strip lining over CS base material for corrosion protection . This striplining has tendency to bulge & develops crack in service . We have observed severe corrosion of CS base material under striplining at some locations . We want to ensure integrity of base material .Is there a technique available which will allow us to find out these affected /corroded/grooved locations without removal of strips .-can be from outside on run or from inside during the shutdown of unit . Column operates at about 400deg C .
: Thanks .
------------ End Original Message ------------

I'm assuming CS stands for carbon steel and the column is a shell and the SS is a stainless steel liner that isn't bonded to the shell. The inspection of the CS shell is easily done from outside the shell using a UT wall thickness gage. Calibrate the gage on a sample of the wall of known thickness and take as many measurements required to verify the integrity of the shell. This is a very common procedure and the equipment is very affordable. Be sure to explain as much detail to the sales rep. if you plan to purchase the equipment.


 
 Reply 
 
Simon Amallraja
Simon Amallraja
09:08 Mar-06-2007
Re: NDE technique
----------- Start Original Message -----------
: I will like to have experts opinion on following :
: We have a Column in vacuum service in Refinery . Column bottom section has been provided with SS strip lining over CS base material for corrosion protection . This striplining has tendency to bulge & develops crack in service . We have observed severe corrosion of CS base material under striplining at some locations . We want to ensure integrity of base material .Is there a technique available which will allow us to find out these affected /corroded/grooved locations without removal of strips .-can be from outside on run or from inside during the shutdown of unit . Column operates at about 400deg C .
: Thanks .
------------ End Original Message ------------

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D.Simon Amallraja.


 
 Reply 
 
Ryan Burns
Ryan Burns
03:10 Mar-23-2007
Re: NDE technique
I have had some experience with similar application on coker tower. If geometry and access allows, the use of a mechanized rastered scanner to perform 0 degree C-Scan and B-Scan mapping is very effective. This would have to be done off-line, but the data are accurate and reproducable. Depending on the type of corrosion / erosion you are finding, we also used ratered shear wave to give a profile of the void. For example, the failure in the coker clad was very small, <.300" diam., but the void in the cs was huge in comparison. The use of manual UT done online at that temperature would necessitate a probe duty cycle and spot readings would be all you could do. You may not even find the anomalies, and scanning to size the void is not feasable.

Regards,

Ryan.

----------- Start Original Message -----------
: : I will like to have experts opinion on following :
: : We have a Column in vacuum service in Refinery . Column bottom section has been provided with SS strip lining over CS base material for corrosion protection . This striplining has tendency to bulge & develops crack in service . We have observed severe corrosion of CS base material under striplining at some locations . We want to ensure integrity of base material .Is there a technique available which will allow us to find out these affected /corroded/grooved locations without removal of strips .-can be from outside on run or from inside during the shutdown of unit . Column operates at about 400deg C .
: : Thanks .
: I'm assuming CS stands for carbon steel and the column is a shell and the SS is a stainless steel liner that isn't bonded to the shell. The inspection of the CS shell is easily done from outside the shell using a UT wall thickness gage. Calibrate the gage on a sample of the wall of known thickness and take as many measurements required to verify the integrity of the shell. This is a very common procedure and the equipment is very affordable. Be sure to explain as much detail to the sales rep. if you plan topurchase the equipment.
------------ End Original Message ------------




 
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