where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -
2030 views
Technical Discussions
Justin Goranson
Justin Goranson
08:46 Mar-27-2001
Corrosion under scale or insulation

We are looking for a method of testing for corrosion of steel in Nuclear Waste tanks. There is a layer of scale or sludge on most of the walls, and we need a way of either using the technique without removing all of the scale(preferable), or a method of detection after it has been removed, which will cause the surface to be rough


 
 Reply 
 
Tore Ausland
Consultant
Norway, Joined Mar 2001, 3

Tore Ausland

Consultant
Norway,
Joined Mar 2001
3
00:05 Mar-27-2001
Re: Corrosion under scale or insulation
: We are looking for a method of testing for corrosion of steel in Nuclear Waste tanks. There is a layer of scale or sludge on most of the walls, and we need a way of either using the technique without removing all of the scale(preferable), or a method of detection after it has been removed, which will cause the surface to be rough
.


If you are looking for a permanent coorosion monitoring I will suggest FSM-IT. I am not sure of your access to install FSM-IT on tank surface outside, but if you have this is a very god corrosion monitoring tool.

FSM-IT (Field Signature Method) is a technology great even fore long time (lifetime e.g. 30 year)monitoring.

General features:
-Operator independent readings.
-Can be used for complex geometry (bends, T-bends, y-bends etc..
- Can be used in high temperature environments (up to 400°C)
-Monitors weld Corrosion
- Remote operation.
-Very high sensitivity compared to e.g. UT
-Sensitivity increases as defects develope.

Operator kit with portable instrument and trend software for analysis, reporting.

Best Regards
Tore Ausland


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

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
280
03:30 Mar-27-2001
Re: Corrosion under scale or insulation
We use an Acoustic Emission technique on listening and grading corrosion activity in Bulk Liquid Storage Tanks (carbon Steel). Technique works well as the floors are inaccessible and we want to know the condition of the floor plate (whilst scale and sludge) present to determine which tanks to shutdown for inspection.
There is now a portable version developed from a french Petrochemical roject which can be used by untrained (equipment only) operators to do periodic surveys or as permennetly installed sensors.
If you are interested email me direct and I will give you contact details for the technology.


 
 Reply 
 
Cameron Waters
Director, Asia Pacific
Applus RTD, Australia, Joined Nov 1999, 5

Cameron Waters

Director, Asia Pacific
Applus RTD,
Australia,
Joined Nov 1999
5
02:30 Mar-28-2001
Re: Corrosion under scale or insulation

: : We are looking for a method of testing for corrosion of steel in Nuclear Waste tanks. There is a layer of scale or sludge on most of the walls, and we need a way of either using the technique without removing all of the scale(preferable), or a method of detection after it has been removed, which will cause the surface to be rough


Justin,

The INCOTEST would be perfect for what you are try to achieve, it can take reading either through the scale or direct in contact with the very rough surface. See our web page for a brief explanation of the technique.

Where are you based as there are only a limited number of approved users for the INCOTEST system in the world and I will be able to point you to the one nearest to you.

What is the wall thickness you are trying to measure??

Cheers

============================================
Cameron Waters
pndt
Manager - Advanced Inspection Services
143 Cambridge Street
West Leederville, Perth Western Australia
Ph. +61+8+9382 3844
Fax +61+8+9382 4458
Mobile 0419 831 893
http://www.pndt.com.au




 
 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
02:35 Mar-29-2001
Re: Corrosion under scale or insulation
Do you plan to access the tank wall from outside, as is the usual practice? If so, an ultrasonic thickness gauge with A-scan display will do in many cases. If the area is highly radioactive, then you will have to think of a permanently installed probe with read out from outside the area. Let me know whether you have tried this approach - Swamy

: We are looking for a method of testing for corrosion of steel in Nuclear Waste tanks. There is a layer of scale or sludge on most of the walls, and we need a way of either using the technique without removing all of the scale(preferable), or a method of detection after it has been removed, which will cause the surface to be rough
.



 
 Reply 
 
Fred Raco
Director
CP Industries - Div. of Reunion Industries, Inc., USA, Joined Jan 2001, 6

Fred Raco

Director
CP Industries - Div. of Reunion Industries, Inc.,
USA,
Joined Jan 2001
6
04:55 Mar-29-2001
Re: Corrosion under scale or insulation
: Do you plan to access the tank wall from outside, as is the usual practice? If so, an ultrasonic thickness gauge with A-scan display will do in many cases. If the area is highly radioactive, then you will have to think of a permanently installed probe with read out from outside the area. Let me know whether you have tried this approach - Swamy
.
: : We are looking for a method of testing for corrosion of steel in Nuclear Waste tanks. There is a layer of scale or sludge on most of the walls, and we need a way of either using the technique without removing all of the scale(preferable), or a method of detection after it has been removed, which will cause the surface to be rough
: .
.
The suggestion of using an A-Scan machine is a good one. May I add that it would be more accurate to use an echo to echo technique instead of interface to first echo. This way, the scale will not be added to the total thickness measurement. Added gain and filtering will also be needed. If you are not familiarwith my terminology, email me and I will explain in more detail.
Good Luck,
FER


 
 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
01:40 Apr-03-2001
Re: Corrosion under scale or insulation
Yes, the echo to echo method is more accurate than the interface to the echo method. In fact, if you are able to get more echoes, taking the interval from the 2nd to 4th or 5th will be much more accurate. This depends of course on the attenuation. If it heavily attenuated, we may have to do with even the interface to the first echo.

: : Do you plan to access the tank wall from outside, as is the usual practice? If so, an ultrasonic thickness gauge with A-scan display will do in many cases. If the area is highly radioactive, then you will have to think of a permanently installed probe with read out from outside the area. Let me know whether you have tried this approach - Swamy
: .
: : : We are looking for a method of testing for corrosion of steel in Nuclear Waste tanks. There is a layer of scale or sludge on most of the walls, and we need a way of either using the technique without removing all of the scale(preferable), or a method of detection after it has been removed, which will cause the surface to be rough
: : .
: .
: The suggestion of using an A-Scan machine is a good one. May I add that it would be more accurate to use an echo to echo technique instead of interface to first echo. This way, the scale will not be added to the total thickness measurement. Added gain and filtering will also be needed. If you are not familiar with my terminology, email me and I will explain in more detail.
: Good Luck,
: FER
.



 
 Reply 
 

Product Spotlight

ISAFE3 Intrinsically Safe Sensor System

ISAFE3 intrinsically safe sensor system of Vallen Systeme is especially targeted at the petrochemica
...
l - as well as oil and gas transportation industry. The sensor system is designed for permanent monitoring or periodic inspection tasks. Sensors are available for different AE-frequency ranges optimized for corrosion and fatigue crack detection and other applications. The ISAFE 3 sensor system consists of an AE-sensor (model ISAS3) certified according to ATEX/IEC for installation in zone 0, gas group IIC, IP68, 20 to +60 °C, and a signal isolator (model SISO3) certified for installation in zone 2. An ISAS3 sensor can be mounted in atmosphere or submerged, e.g. in water or crude oil. It is supported by mounting tools for temporary (magnets) or permanent (welded) installation. ISAFE3 supports automatic sensor coupling test and can be used with any AE signal processor supporting 28V supply at 90 mA peak, e.g. Vallen Systeme ASIP-2/A.
>

NDT.net launches mobile-friendly design

NDT.net has revamped its website providing a mobile-friendly design.The front page received a comp
...
letely new design and all other sections are now reacting responsively on mobile devices. This has been a major step to make our website more user- friendly.
>

Immersion systems

ScanMaster ultrasonic immersion systems are designed for high throughput, multi shift operation in a
...
n industrial or lab environment. These fully integrated systems provide various scanning configurations and incorporate conventional and phased arrays technologies to support diverse applications, such as inspection of disks, bars, shafts, billets and plates. All of ScanMaster immersion systems are built from high accuracy scanning frames allowing for scanning of complex parts and include a multi-channel ultrasonic instrument with exceptional performance. The systems are approved by all major manufacturers for C-scan inspection of jet engine forged discs. Together with a comprehensive set of software modules these flexible series of systems provide the customer with the best price performance solutions.
>

IRIS 9000Plus - Introducing the next generation of heat exchanger inspection.

Representing the seventh generation of the IRIS system, the IRIS 9000 Plus has nearly 200 years of c
...
ombined field inspection experience incorporated in its design. This experience combined with a strong commitment to quality and a history of innovation has made Iris Inspection Services® the undisputed leader in IRIS technology.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window