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 -
523 views
Technical Discussions
S.R.GPRABHU
Consultant, AUT specialist
FREELANCE, India, Joined Aug 2008, 64

S.R.GPRABHU

Consultant, AUT specialist
FREELANCE,
India,
Joined Aug 2008
64
00:18 Nov-14-2007
PHASED ARRAY EFFECTIVENESS

We paln to buy a PA equipment with 16:64 or 16:128 configurations for using in a production (GAS) platform offshore for corrosion analysis of equipments as well as thickness readings in piping. Can some one advise the PA system's effectiveness or is it worth to buy a PA system for this purpose?wHAT PROBES WE NEED TO DO CORROSION MAPPING ?Do we need TOFD scanner also?



 
 Reply 
 
Michael Moles †2014 *1948
, Joined ,
06:10 Nov-14-2007
Re: PHASED ARRAY EFFECTIVENESS
----------- Start Original Message -----------
: We paln to buy a PA equipment with 16:64 or 16:128 configurations for using in a production (GAS) platform offshore for corrosion analysis of equipments as well as thickness readings in piping. Can some one advise the PA system's effectiveness or is it worth to buy a PA system for this purpose?wHAT PROBES WE NEED TO DO CORROSION MAPPING ?Do we need TOFD scanner also?
------------ End Original Message ------------

As always in phased arrays, the best probe depends on your specific application. If you are looking for large area coverage in a short time, you could use a 128 element array. The problems with this array are largely from coupling; the array is long, and maintaining coupling may be difficult. You will also need to use a wedge to minimize wear on the probe face, and for a delay line. Normally, we recommend pumping water as the couplant (an aquarium pump normally will do), since it is more difficult to get consistent coupling with smeared-on couplant. However, the ultrasonic coverage is not so good as with smaller arrays with smaller elements.

If you have a particularly rough surface, a smaller array may work better. Also, if you are looking for very small defects, e.g. pinhole corrosion, you may be better off with a smaller array, e.g. 64 elements (also with wedge/delay line) to give you a better pulse density. This assumes that the material is OK for ultrasonics, e.g. carbon steel, not some exotic material.

So, there is no simple answer, but it depends on your surface, the component for access, the speed of scanning required, and the defects. Hope this helps, and keep in touch.

As for a TOFD scanner, maybe and maybe not. It depends on your defects and component. if you want rapid area scanning, TOFD is OK, but you will probably get better and easier analysis using PA. I would try PA first.



 
 Reply 
 

Product Spotlight

Immersion systems

ScanMaster ultrasonic immersion systems are designed for high throughput, multi shift operation in a
...
n industrial or lab environment. These fully integrated systems provide various scanning configurations and incorporate conventional and phased arrays technologies to support diverse applications, such as inspection of disks, bars, shafts, billets and plates. All of ScanMaster immersion systems are built from high accuracy scanning frames allowing for scanning of complex parts and include a multi-channel ultrasonic instrument with exceptional performance. The systems are approved by all major manufacturers for C-scan inspection of jet engine forged discs. Together with a comprehensive set of software modules these flexible series of systems provide the customer with the best price performance solutions.
>

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.
>

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?
>

Surf-X® Array Probe

Introducing the Surf-X family of flexible Eddy Current Array (ECA) probes. Featuring unique multiple
...
coil sets and proprietary X-PROBE technology, Surf-X array probes can quickly and accurately handle a range of inspection applications, from inspecting corrosion or cracking in pipes, pressure vessels, or tanks, to assessing and sizing cracks in raised welds and friction stir welds.
>

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