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 -

882 views
Technical Discussions
sk chaule
sk chaule
08:33 Sep-27-2009
water wall corrosion

Can anybody suggest Best Method to detect localised internal corrosion in boilar water wall tubes?
What is the best way to make "mosaic" UT probe? Or is it available in maket ready made? Suggestion Please.

    
 
 
Jim Draper
Consultant, ASNT Level III MT PT RT VT
Draper NDT, USA, Joined Jul 2009, 99

Jim Draper

Consultant, ASNT Level III MT PT RT VT
Draper NDT,
USA,
Joined Jul 2009
99
16:28 Sep-27-2009
Re: water wall corrosion
In Reply to sk chaule at 08:33 Sep-27-2009 (Opening).

My first try would be an ultrasonic thickness gauge. If for some reason that doesn't work, I have used radiography. The down side to radiography is, you can't give an exact measurement of the wall thickness, but you can see the corrosion as dark spots on the film.

    
 
 
John Pursley
R & D
Envision Product Design, USA, Joined Oct 1999, 23

John Pursley

R & D
Envision Product Design,
USA,
Joined Oct 1999
23
08:16 Sep-28-2009
Re: water wall corrosion
In Reply to sk chaule at 08:33 Sep-27-2009 (Opening).

Envision Product Design has developed a digital x-Ray automated boiler waterwall inspection system with backing from EPRI. This system is now ready for commercial application with the 1st prodution unit going to EPRI in October 2009. Http://cmosxray.com

    
 
 
Slawomir Mackiewicz
Slawomir Mackiewicz
14:36 Sep-28-2009
Re: water wall corrosion
In Reply to sk chaule at 08:33 Sep-27-2009 (Opening).

For reliable detection of localized/pitting corrosion I would suggest application of ultrasonic corrosion mapping system with semi continues thickness data collection and C-scan display of measured wall thickness. There are several systems of this type available on the market. They may be equipped with mechanized, semi mechanized or manual scanners. The main drawback of this type of systems is time consuming scanning.

To overcome this problem when testing large scale objects you can sometimes adopt a statistical approach based on the Statistical Theory of Extreme Values. With this methodology you can obtain quite reliable evaluation of corrosion damage of big structures on the bases of actual scanning of only small fraction (e.q. 2%) of their total area.

    
 
 

Product Spotlight

Lyft™: Pulsed Eddy Current Reinvented

PEC Reinvented—CUI Programs Redefined Corrosion under insulation (CUI) is possibly the greatest u
...
nresolved asset integrity problem in the industry. Current methods for measuring wall thickness with liftoff, without removing insulation, all have severe limitations. Eddyfi introduces Lyft — a reinvented, high-performance pulsed eddy current (PEC) solution. The patent- pending system features a state-of-the-art portable instrument, real- time C-scan imaging, fast data acquisition with grid-mapping and dynamic scanning modes, and flexibility with long cables. It can also scan through thick metal and insulation, as well as aluminum, stainless steel, and galvanized steel weather jackets. Who else but Eddyfi to reinvent an eddy current technique and redefine CUI programs. Got Lyft?
>

IntraPhase Athena Phased Array System

The Athena Phased Array system, manufactured by WesDyne NDE Products & Technology, consists of a pha
...
sed array acquisition system and PC running IntraSpect software. A PC is used to perform acquisition, analysis and storage of the data. System hardware is capable of operating up to four data sets with any combination of phased array or conventional UT probes. NOW AVAILABLE IN 64-64 CONFIGURATION.
>

Research and Applications Development For NDT

The Research and Applications Development (RAD) group is a newly formed team within Acuren dedicat
...
ed to tackling challenging inspection problems. Our focus is the development of novel, field deployable, advanced inspection techniques for use in cases where standard NDT methods are ineffective. We don't wait for new innovations, we engineer them. From concept to commissioning.
>

NovaScope 6000

The all-digital Novascope 6000 is a portable, ultra-high precision thickness gauge for high-speed
...
thickness measurement. Novascope 6000 has unmatched capabilities and unique features including: •Superior Resolution with high contrast, high-speed color RF display •High pulser voltage •Real-time video output •Increased internal/external data storage •Programmable SetUp features •Battery & AC Powered
>

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