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 -
912 views
Technical Discussions
Muksin Anang
NDT Inspector,
-, Indonesia, Joined Oct 2001, 4

Muksin Anang

NDT Inspector,
-,
Indonesia,
Joined Oct 2001
4
01:48 Jan-06-2004
Thickness Measure of Austenitic Welds at High Temp

I have problem on measuring a pipe "weld" thickness of an austenitic material at moderate temperature. Due to corrosion on inside of the pipe, mostly at root of the weld, I have to monitor it by measuring the welds thickness. The details are as follows:

Pipe Diameter : 4" up to 8"
Pipe Thickness : 0.25" up to 1"
Operating temp. : 180°C

By an ultrasonic thickness meter with 5MHz 0.4" dia and 10MHz 0.3" transducers, it can only measured the pipe and elbow thicknesses. But not the weld thickness.

By a Digital Flaw Detector with 5MHz 0.4" dia transducer, it can only measured the weld thickness up to 0,5" thick. It can not detect the weld thicker than 0,5".

As we know that austenitic weld is a highly attenuated material. And so, temperature. Anybody can help me, is that possible to measure 1" thick weld using a lower frequency with smaller crystal transducer? Where can I found such a tranducer? Anybody have any idea about the test procedure? Are there any other applicable NDT method?

Thanks in advance.

Muksin A.


 
 Reply 
 
Sasaki
Sasaki
01:33 Jan-07-2004
Re: Thickness Measure of Austenitic Welds at High Temp
Radiography may help your needs.

Place a multi-step thickness gage block on a SS block of the same thickness as the pipe wall, and radiography both pipe and this block on the same film.

Then, you may compare the density of the weld with the steps.

The closest densities of the two, weld and step, is representing the thickness of weld.

Hope I could have explained properly.


 
 Reply 
 
N. Kuppusamy
Consultant, NDT Level-III Engineer
Advanced Inspection & Testing (S) Pte Ltd, Singapore, Joined Dec 2003, 34

N. Kuppusamy

Consultant, NDT Level-III Engineer
Advanced Inspection & Testing (S) Pte Ltd,
Singapore,
Joined Dec 2003
34
03:02 Jan-08-2004
Re: Thickness Measure of Austenitic Welds at High Temp
deg. F) and if the reading obtained was a surface temperature of 460 degree C (860deg. F) the apparent reading should be reduced by 8%.

This correction is an average one for many types of steel. The correction factor for any particular material can be derived experimentally.

Regards,

N.Kuppusamy


----------- Start Original Message -----------
: Radiography may help your needs.
: Place a multi-step thickness gage block on a SS block of the same thickness as the pipe wall, and radiography both pipe and this block on the same film.
: Then, you may compare the density of the weld with the steps.
: The closest densities of the two, weld and step, is representing the thickness of weld.
: Hope I could have explained properly.
------------ End Original Message ------------




 
 Reply 
 
Sasaki
Sasaki
05:12 Jan-08-2004
Re: Thickness Measure of Austenitic Welds at High Temp
A rule of thump (for steels) often used is as follows:
..........

is a citation from para. 8.5, ASTM E797 "Measuring Thickness by Manual Ultrasonic Pulse-Echo Contact Method"


 
 Reply 
 
pankaj
pankaj
00:37 Sep-10-2004
Re: Thickness Measure of Austenitic Welds at High Temp
what is the direct relation ( formula) between pipe schedual no and pipe thickness


 
 Reply 
 

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?
>

GEKKO - Portable Phased Array Testing with TFM in Real-Time

The portable phased array testing system GEKKO provides 64 parallel test channels. On creating testi
...
ng parameters the operator is assisted by the CIVA software. Due to its modular set-up the GEKKO instrument is suitable for operators of all skill levels.
>

AMIGO2

TSC Amigo2 - ACFM technology has developed a solid reputation for accurately detecting and sizing
...
surface-breaking cracks through paint and coatings. As the industry demands increased performance in speed, signal quality, and portability, it’s time for an evolution. It’s time for Amigo2.
>

Combination of Digital Image Correlation and Thermographic Measurements

The combination of measuring results from the digital image correlation (ARAMIS, DIC) and temperat
...
ure measuring data from infrared cameras permits the simultaneous analysis of the thermal and mechanical behavior of test specimens in the materials and components testing field.
>

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