Standard Membercharlie
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Hi,
My understanding is that it is a check to ensure that the minimum pipe insertion has been acheived and that the gap (expansion gap) is of a minimum size.Visual Inspection involves looking at a weld with the naked eye and/or with some level of magnification. Typically, our inspectors are checking for cracks, pits, surface pores, undercut, underfill, missed joints, and other aspects of the weld.
Usually this is a task which all Full Matrix Capture systems should do. So you should check with companies selling systems doing this.
eddyfi is now distributing the M2M series of PAUT systems which offer FMC abd as far as I know they offer postprocessing with CIVA (M2M always used a user interface for their PAUT machines based on parts of CIVA).As you are from Germany check with IzfP in Saarbruecken, they also worked a lot on this topic for decades. Same is as far as i know for BAM in Berlin. I just came across a PhD-Thesis describing Ray-Tracing – Quantitative Evaluation of Ultrasonic Wave Propagation in Inhomogeneous Anisotropic Austenitic Welds using 3D Ray Tracing Method. The author Sanjeevareddy Kolkoori has a lot of experience with 3D datasets in Simulation as well in display, and he worked on UT as well as CT even in 3D-Backscatter-X-Ray. Check with the DGzfP, they had some interesting conferences on that topic. In Researchgate you may find more papers from him and the relevant BAM researchers.
your question would get a similar response if you asked ‘How long is a piece of string?’ You have not defined your question clearly enough for us to give an earnest response.
Glass fibre products are manufactured in a variety of different ways. Hand laid, machine laid, copped mat spray come to mind.
The percentage of glass fibre to resin or plastic will also weigh heavily on the possibility of a confident ultrasonic test. Also how is the product cured in an oven for a slow cure or outside subject to atmospheric conditions.
We have tested glass fibre hulls of mine hunter ships for our Navy, these hulls were up to 200 mm thick. BUT because the curing was not properly controlled air bubbles that were in the glass fibre matrix did not get the possibility to be drawn out of the material. Which meant the material was riddled with 1.5 – 2.0 mm air bubbles. Which hamoered our ability to test ultrasonically.Hope this explains somewhat the dangers of testing Glass fibre reinforced material
the indications look like production defect. usually corrosion defects that detected by TOFD will affect on back wall position and amplitude of back wall signal(if it is big pitting).index position of corrosion on S-Scan will be different from each side and you can measure the width of corrosion by PAUT.
May be there is a delamination between the sheet (monolithic) and the honeycomb.
I suggest you to use infrared thermography method (IRT) to check this.
Regards,Please could you guide me in the right direction as to where I could obtain such information (PT/MT techniques?)as I wish to provide a professional service where safety is not negotiable.
Any assistance shall be greatly appreciated, thank you.
Remote Video Inspection (RVI) allows one or more parties to remotely perform an inspection of a building or building components using video technology. In order for jurisdictions to be able to use this method, AHJ approval is required.
You may refer to Article 22 of ASME SEC V – SE-94, para 7.0 and table 1.
This provides guidelines related to energy of radiation source and corresponding thickness being radiographed. Hope this helps your needed detail.read paragraph 7.8 of the standard
Please visit our web-page http://www.primexpo.ru/ndt/eng for more information on this event or contact project manager Maria Badakh ndt@primexpo.
I have similar problem, did you find way how to resolve it.
Appreciate your responce to e-mail: alm_transport@aol.com
With surfaces which are not parallel, there will be some diffraction of the sound beam as it either enters or leaves the sample, just as in TTU. It depends how “unparallel” the faces are. “Stepped” surfaces should not really present problems however, as long as you consider the increase in thickness with more plies.
It also depends on the orientation of the sample. If it is not perpendicular to the transmit sensor and the screen, then sound will again be diffracted.With respect to your question about structures other than thin composite panels, the operating frequency will be the determining factor. If I remember correctly, the Santec systems acoustography operates at around 3 MHz, so is not suited to very thick monolithic Carbon Fibre samples, nor to sandwich structures or Fibreglass.
Niranjan, there have been a few discussions on the NDT forum regarding phased-array UT and focussing. Since we use short pulse excitation of elements the “acoustic variations” in the near field are perhaps not as drastic as you may have been led to believe. You need only look at the AVG diagrams for monoelement probes to see that there is usually just a slight dip prior to the maximum at the near field distance. Go to the A-Z Encyclopaedia and see the graph illustrated under the definition for DAC As for the principles of phasing, perhaps the videos in the photoelastic series can help understanding.
NDT has a series I called Photoelastic Visualisation _ Phased Array Sound Fields. There are about 12-13 articles in which I attempt to illustrate how the beams are formed and interact. The phased-array portion starts at Part 14 ) and with each article there is a short video that you can link to via the link at the top of the first page in each case; e.g. for Part 14 it is Focussing is not something you should be doing with all applications of phased-array UT! It has limited uses where spatial resolution is important. For most “detection” applications you would use an unfocussed beam.
Since “focussing” requires small delays of the inner elements relative to the outer elements, it is clear that once you have no delays applied to the elements you can no longer focus a beam. No relative delays applied to the elements is the same as a flat unfocussed probe which will have a natural focus at its near field distance. Since the near field distance is fixed by the aperture and wavelength you cannot “focus” beyond it.You should definitely take a look on the Vanta and i am sure you will be surprised by the performance. May i know whats your application as there are few models of Vanta
. Moreover Vanta comes with a standard 3 year warranty. Some of the features as followsDrop tested using U.S. Department of Defense methods (MIL-STD-810G), reducing the risk of damage and costly repairs when a device is dropped or jostled.
IP65 rated dust and water resistant to protect against the hazards found in even the most challenging environments.*
Withstands a temperature range of -10 °C to 50 °C (14 °F to 122 °F) at full duty cycle, so you waste less time waiting for your analyzer to cool.**
The detector shutter on C and M series models helps prevent punctures so you can analyze rough surfaces with confidence.
* M Series analyzers are IP64 rated.
** With optional fan. The fan assembly is IP56 rated. Operates continuously at 33 °C without the fan.
AUT tends to focus more on the bevel sidewalls as compared to RT which wouldn’t miss a 3mm Pore that AUT at times might. Both the techniques have their own advantages and disadvantages and shouldn’t be compared. Both the techniques use API 1104 for evaluation again which are basically the same. I unfortunately haven’t had the chance to work with RT and I wouldn’t be able to answer all of your questions I’m sorry.
I would recommend AUT when it comes to long pipelines, the primary reason being that if you’re running a semi automatic / automatic welding mainline setup, your biggest concern would be production in which case AUT would give you more real time results in the sense that the AUT crew would be just beyond the mainline most of the time. You can even have the welding crew informed beforehand as well for certain indications that keep repeating themselves at particular locations, the welders and the on site technician would be more than willing to fix it once you give them the depth, the location and the height and they figure out which pass it comes from. You can also have a repair crew run behind the AUT crew to fix the repairs immediately. Overall this kinda setup usually works out very well for everyone.
I hope this helps.
I am going to assume the client wants to keep any external protective coatings in place?
If such is the case would you know what the acoustic velocity of the coating and thickness is? As well as the acoustic velocity of the substrate you are needing to examine. There is a potential method but you may need to use a crawler system with an umbilical setup and it would be very dependant on access.
There may also be a radiographic solution to this issue. I have used it to approximate depth of corrosion on internal surfaces of sealed or difficult to examine components in aerospace.
Let us know the answers to the above and hopefully we can assist you in finding a viable solution
Niranjan, there have been a few discussions on the NDT.net forum regarding phased-array UT and focussing. Since we use short pulse excitation of elements the “acoustic variations” in the near field are perhaps not as drastic as you may have been led to believe. You need only look at the AVG diagrams for monoelement probes to see that there is usually just a slight dip prior to the maximum at the near field distance. Go to the A-Z Encyclopaedia and see the graph illustrated under the definition for DAC As for the principles of phasing, perhaps the videos in the photoelastic series can help understanding.
NDT.net has a series I called Photoelastic Visualisation _ Phased Array Sound Fields. There are about 12-13 articles in which I attempt to illustrate how the beams are formed and interact. The phased-array portion starts at Part 14 and with each article there is a short video that you can link to via the link at the top of the first page in each case; e.g. for Part 14 it is Focussing is not something you should be doing with all applications of phased-array UT! It has limited uses where spatial resolution is important. For most “detection” applications you would use an unfocussed beam.
Since “focussing” requires small delays of the inner elements relative to the outer elements, it is clear that once you have no delays applied to the elements you can no longer focus a beam. No relative delays applied to the elements is the same as a flat unfocussed probe which will have a natural focus at its near field distance. Since the near field distance is fixed by the aperture and wavelength you cannot “focus” beyond it.I suspect you are on or over the limit of what you can achieve with Iridium. Use Cobalt or go with ultrasonic wall thickness testing.
NACE having separate Course and Certification for Coating Activities.
For CSWIP Certification Touch with TWIcould you please send the list of equipment at the earliest. please send your list at details given.
rajeev chaudhari
offshore testing & inspection services
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tel: +91 22 7681946 7670874
email otislab@vsnl.netContact the manufacturer or try to get an exception to use an indirect method.
To measure the pulse current is difficult , depend on shape and time .I believe that the best is to go for 10mm calibration plate with different FBH’s ( 20%,40%,60%,80%). And also during the inspection, better set the threshold to the minimum, that is 20% . After the inspection, you will be able to adjust the threshold from the reporting software.
I have used the WaveMaker G4, and the Teletest and with the experience of 10 years the best option is the wavemaker G4; Olympus is just opening the market with its guided wave equipment
In think that at this time, if you want to work, you have to be flexible. Looking at the post in the Job Offers on this site, it seems that with your qualifications you can easily find a job don’t you think?
