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- since 1996 -

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Technical Discussions
Nader A.Rahim
NDT Inspector
Gulf petrochmical ind. co., Bahrain, Joined Jul 2001, 3

Nader A.Rahim

NDT Inspector
Gulf petrochmical ind. co.,
Bahrain,
Joined Jul 2001
3
05:54 Jul-09-2001
on line tank inspection

I am looking for a NDT method to inspect a carbon steel water tank ( operating at 50C)rubber linned from inside. the tank can not be drain for internal inspection. So any body know of a method or have experince in examining such tank from out side please advice

the area of concern is the integrety of the rubber lining and corrosion below the rubber.

Nader


 
 Reply 
 
Jens Forker
Jens Forker
07:32 Jul-10-2001
Re: on line tank inspection
Dear Nader,
acoustic emission testing (AE) may be a tool to do this job. By attaching suited sensors on the outside of the tank ongoing corrosion usually can be detected. It will not give you direct information regarding the integrity of the rubber lining, but should provide information where and how much acoustic activity (indicating corrosion) is present.
Regards
Jens Forker

: I am looking for a NDT method to inspect a carbon steel water tank ( operating at 50C)rubber linned from inside. the tank can not be drain for internal inspection. So any body know of a method or have experince in examining such tank from out side please advice
.
: the area of concern is the integrety of the rubber lining and corrosion below the rubber.
.
: Nader
.



 
 Reply 
 
Bob Rose
Bob Rose
01:50 Jul-10-2001
Re: on line tank inspection
Dear, Nader
Integrity of tank wall may be tested using Ultrasonic crawlers such as the Spider, unfortunately this will not give direct information regarding the rubber lining but will give residual wall thickness measurements.

regards

Bob Rose
: I am looking for a NDT method to inspect a carbon steel water tank ( operating at 50C)rubber linned from inside. the tank can not be drain for internal inspection. So any body know of a method or have experince in examining such tank from out side please advice
.
: the area of concern is the integrety of the rubber lining and corrosion below the rubber.
.
: Nader
.



 
 Reply 
 
John O'Brien
Consultant, -
Chevron ETC , USA, Joined Jan 2000, 280

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
280
07:51 Jul-10-2001
Re: on line tank inspection
You need to provide details of actuall tank arrangement. If you can get access to external surfaces then and ultrasonic inspection will give you remaining wall thickness and you can compare for damage areas. Remote wall crawlers or mapping devices will enhance the data you get. If rubber was originally bonded to surface you could look for amplitude changes to indicate where bond/debond still occurs.

I area where you cannot get external access i.e. if the tank sits on the ground you can use Acoustic Emission to listen for and quantify the degree of Acoustic Activity due to corrosion processes. These techniques are regularly applied in these applications.


 
 Reply 
 
Asim Niazi
NDT Inspector
Inspection Unit, Fauji Fertilizer Co., Pakistan, Joined Jul 2001, 6

Asim Niazi

NDT Inspector
Inspection Unit, Fauji Fertilizer Co.,
Pakistan,
Joined Jul 2001
6
08:31 Jul-11-2001
Re: on line tank inspection
Dear Nadir,

You may like carryout ultrasonic thickness monitoring to detect any suspected loss in wall thickness.That is the only possibe external inspection apart from A.E.(accoustic emmision). But I am afraid that it will not help you in checking the health of rubber lining.

But for now ultrasonic thickness monitoring will be sufficient to ensure equipment health.

Regards


ASIM NIAZI




 
 Reply 
 
Dimitrios Kouroussis
Director,
MISTRAS GROUP HELLAS A.B.E.E., Greece, Joined Apr 2001, 2

Dimitrios Kouroussis

Director,
MISTRAS GROUP HELLAS A.B.E.E.,
Greece,
Joined Apr 2001
2
01:31 Jul-11-2001
Re: on line tank inspection
Dear Mr Rahim,

Also, note, that for 100% evaluation of the tank floor corrosion condition,without opening or cleaning, TANKPAC is a well established, fast, and reliable (reliability results in http://www.ndt.net/article/ecndt98/chemical/095/095.htm)procedure based on Acoustic Emission monitoring, developed by Physical Acoustics Corporation.

As far as the tank walls are concerned, automated UT can provide you with the wall remaining thickness(http://www.envirocoustics.gr/services/ut_corrosves_eng.htm)

Best regards,
Dimitrios Kouroussis


: I am looking for a NDT method to inspect a carbon steel water tank ( operating at 50C)rubber linned from inside. the tank can not be drain for internal inspection. So any body know of a method or have experince in examining such tank from out side please advice
.
: the area of concern is the integrety of the rubber lining and corrosion below the rubber.
.
: Nader
.



 
 Reply 
 
Sakine Baþeðmez
Sakine Baþeðmez
07:55 Nov-04-2002
Re: on line underground tank inspection
Dear Sirs
I would like to have some information about the ultrasonic inspection of the underground tanks.
Kind regards

Sakine Baþeðmez


 
 Reply 
 

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