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 -

Controle Mesure Systemes
Contrôle Mesure Systèmes designs, develops and manufactures nearly 30 years a complete NDT range of products in eddy current and ultrasonic testing methods.
5080 views
Technical Discussions
Tom
Tom
09:50 Aug-14-2007
Elliptical Shots

Does anyone know a general rule of thumb as to how much of an offset you should use to radiograph a 2" joint using an elliptical exposure?


    
 
 Reply 
 
Dent
Consultant, NDE Manager NDELevel III/3
NDT Consultant, Canada, Joined Nov 1998, 248

Dent

Consultant, NDE Manager NDELevel III/3
NDT Consultant,
Canada,
Joined Nov 1998
248
05:10 Aug-14-2007
Re: Elliptical Shots
----------- Start Original Message -----------
: Does anyone know a general rule of thumb as to how much of an offset you should use to radiograph a 2" joint using an elliptical exposure?
------------ End Original Message ------------

15 Deg should work.


    
 
 Reply 
 
DJ Kallhof
DJ Kallhof
08:38 Aug-14-2007
Re: Elliptical Shots
----------- Start Original Message -----------
: : Does anyone know a general rule of thumb as to how much of an offset you should use to radiograph a 2" joint using an elliptical exposure?
: 15 Deg should work.
------------ End Original Message ------------

7 : 1 ratio has worked well for me in the past. Back off 14" and offset 2" or 21" and offset 3". You get the idea. The only thing that can make it tricky is excessive weld build up of the root or crown. Take a technique and adjust accordingly.



    
 
 Reply 
 
chris s
chris s
00:44 Aug-15-2007
Re: Elliptical Shots
----------- Start Original Message -----------
: : : Does anyone know a general rule of thumb as to how much of an offset you should use to radiograph a 2" joint using an elliptical exposure?
: : 15 Deg should work.
: 7 : 1 ratio has worked well for me in the past. Back off 14" and offset 2" or 21" and offset 3". You get the idea. The only thing that can make it tricky is excessive weld build up of the root or crown. Take a technique and adjust accordingly.
------------ End Original Message ------------

i use the 7:1 ratio also, works fine. until you get into heavy wall


    
 
 Reply 
 
G.Madhesan
G.Madhesan
01:44 Aug-22-2007
Re: Elliptical Shots
As said by Mr.Dent You can use a 7:1 technique but you have to consider the thickness of the pipe because the root will vary deponds upon the wall thick.


    
 
 Reply 
 

Product Spotlight

NEW! The PragmaPro Instrument Platform

The PragmaPro is based on a modular cartridge technology and supports various NDT instrument modal
...
ities such as UT, PAUT, ECT and many more. This new platform is based on a machined, powder-coated aluminum frame for shock-proofness, best sealing qualities and maximum heat dissipation. This is practical to extend the outdoor temperature range and/or to extend the power injected in the transducers. The PragmaPro is aiming at a very wide range of applications, such as weld scanning, corrosion mapping and composite testing.
>

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.
>

Wireless TOFD scanner

Quick, accurate and highly reproducible welds testing. The System operates wirelessly and is compat
...
ible with any type of Windows based Laptop, Desktop or Tablet.
>

Sci Aps Z-Series Portable Handheld Analysers

The world’s only handheld analyzer that measures carbon content in stainless (yes even L-grades),s
...
teels, and cast irons. Also accepted for low Si analysis for sulfidic corrosion analysis, and is widely used in the power industry for Cr analysis, for flow accelerated corrosion applications.
>

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