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 -
2241 views
Technical Discussions
Kaveh Edalati
Kaveh Edalati
00:35 Oct-12-2005
Criteria for selecting the DWSI or DWDI or Elliptical techniques in in-service pipes

Dear friends
Thank you for your comments on IQI selection in double wall radiography of pipes.
Now, I have two problems:
1- What are the criteria for selecting the radiography technique in double wall radiography of pipes?
In some standards such as ASTM and ASME, when pipe diameter is up to 89 mm, double wall and double image radiography technique shall be used.
But we can not see the clear criterion for selecting the elliptical technique in ASTM or ASME. In API if pipe diameter is up to 63 mm, elliptical should be used.

2- Another problem is maximum allowable source to film distance (SFD) in double wall single image radiography. For example, when minimum SFD is 120 and pipe diameter is 95 mm, what is the practical SFD?
Or, when minimum SFD is 140 and pipe diameter is 95 mm, what is the practical SFD? I think that if SFD is set to 140, the image of upper wall cause in decreasing image quality.
I look forward your comments.

Thank you,
Kaveh


 
 Reply 
 
Payam
Payam
05:36 Nov-02-2005
Re: Criteria for selecting the DWSI or DWDI or Elliptical techniques in in-service pipes
----------- Start Original Message -----------
: Dear friends
: Thank you for your comments on IQI selection in double wall radiography of pipes.
: Now, I have two problems:
: 1- What are the criteria for selecting the radiography technique in double wall radiography of pipes?
: In some standards such as ASTM and ASME, when pipe diameter is up to 89 mm, double wall and double image radiography technique shall be used.
: But we can not see the clear criterion for selecting the elliptical technique in ASTM or ASME. In API if pipe diameter is up to 63 mm, elliptical should be used.
: 2- Another problem is maximum allowable source to film distance (SFD) in double wall single image radiography. For example, when minimum SFD is 120 and pipe diameter is 95 mm, what is the practical SFD?
: Or, when minimum SFD is 140 and pipe diameter is 95 mm, what is the practical SFD? I think that if SFD is set to 140, the image of upper wall cause in decreasing image quality.
: I look forward your comments.
: Thank you,
: Kaveh
------------ End Original Message ------------

Hi Kaveh
As you wrote, there are some chalenge in this case. But you are free in many cases for technique selection in radiography according to your experience.
Payam



 
 Reply 
 
Houston
Houston
08:47 Nov-26-2006
Layne
5e6a9d3147aa


 
 Reply 
 

Product Spotlight

ISONIC 3510

Very Powerful Superior Performance Extremely Portable Smart Phased Array Ultrasonic Flaw Detector an
...
d Recorder with 2 Conventional UT and TOFD Channels uniquely combines PA, single- and multi-channel conventional UT, and TOFD modalities providing 100% raw data recording and imaging. Suitable for all kinds of every-day ultrasonic inspections
>

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).
>

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.
>

Ultrasonic Squirter/Gantry System

TecScan’s NDT Ultrasonic Gantry Systems are industrial Squirter scanners designed for non-destru
...
ctive quality testing and raster scanning of large structures and parts. The Gantry Systems are usually composed of an Industrial Mechanical Scanner and a Control Room with System Workstation.
>

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