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 -

NDTSS - Non Destructive Testing Society of Singapore
Visit us at SINCE 2019
231 views
Technical Discussions
Jagath
India, Joined May 2018, 4

Jagath

India,
Joined May 2018
4
16:41 Jan-21-2020
UT thickness correction on high temperature surfaces

hello friends, please explain the thickness correction on high temperature surfaces ,and give me the example for carbon steel. (I found some answers in Google but I'm not clear about that answers)

 
 Reply 
 
Pradeep Boddu
NDT Inspector,
K-KEM , India, Joined Feb 2016, 32

Pradeep Boddu

NDT Inspector,
K-KEM ,
India,
Joined Feb 2016
32
18:26 Jan-21-2020
Re: UT thickness correction on high temperature surfaces
In Reply to Jagath at 16:41 Jan-21-2020 (Opening).

Jagath,

A rule of thumb is as follows:

The apparent thickness reading obtained from steel walls having elevated temperatures is high by a factor of about 1% per 55°C.
If the instrument was standardized on a piece of similar material at 20°C, and if the reading was obtained with a surface temperature of 460°C, the apparent reading should be reduced by 8%.

Thank You.

 
 Reply 
 
Paul Holloway
Consultant,
Holloway NDT & Engineering Inc , Canada, Joined Apr 2010, 227

Paul Holloway

Consultant,
Holloway NDT & Engineering Inc ,
Canada,
Joined Apr 2010
227
20:54 Jan-22-2020
Re: UT thickness correction on high temperature surfaces
In Reply to Pradeep Boddu at 18:26 Jan-21-2020 .

Pradeep,

A correction... as you correctly state, the velocity of carbon steel decreases approximately 1% for every 55 deg C. This slower velocity means longer transit time, which would fool the machine into thinking the test piece is getting thicker, not thinner. Once the velocity setting was lowered to the correct value, the resulting thickness reading will be reduced to the correct value.

Cheers,
Paul

 
 Reply 
 

Product Spotlight

NDTkit RT

NDTkit RT, TESTIA's Digital Radiography software The NDTkit product line software for X-ray analysi
...
s. NDTkit RT is a software benefiting from the Ultis kernel which is dedicated to radiographic image analysis. It offers a set of tools and filtering processes to assist RT operators in finding relevant flaws.
>

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.
>

Varex Imaging Large Field of View (FOV) Digital Detector Arrays (DDAs)

A larger FOV DDA can reduce the space and volume of the X-ray inspection system on the factory floor
...
, enable faster scanning times, better throughput and better resolution images at a lower dose. Customers can also save time and money. With these benefits in mind, Varex Imaging has designed a family of large FOV detectors (4343HE, XRD 1611, 4343DX-I, 4343CT) for our industrial imaging customers.
>

Eddy Current inspection : RotoETscan Rotating Head

The rotating head RotoETscan detects the presence of longitudinal surface or sub surface defects a
...
t high speed. The rotating head is often installed directly on the production line. It is generally dedicated to the control of long products such as tubes, bars and wires, made of ferrous or non-ferrous material. It can also be used for inspection of small parts (billets).
>

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