COMPUTERIZED UT: PHASED ARRAY AND TOFD
INSPECTION BY PHASED ARRAY TECHNIQUE IS PROGRESSIVELY SUPERSEDING RADIOGRAPHIC TESTING.
That is because this inspection method is not only capable to give an accurate and repeatable documentation of the test
- as is radiographic testing - but it is also faster, less expensive and safer,
not generating ionizing radiation as instead happens during a radiographic examination.
The Phased Array technique is used in several sectors, like:
• Power Generation
• Oil&Gas and Chemical
• Industrial Manufacturing
This method relies on ultrasonic probes, each containing several elements which are electronically activated following appropriate focal laws, allowing the formation of ultrasonic beams inside the material under inspection. The independent activation of each element in a defined sequence shapes the wave front, as requested by the operating necessities. Wedges can be also applied to probes, allowing to optimally direct the beam.
The Phased Array technique allows to inspect complex geometries with limited accessibility: the use of matrix probes allows to examine areas which are almost inaccessible and cannot be examined with conventional techniques. Moreover, this technique can be applied to welds accessible on a single side, like welded nozzles and corner joints.
Using the Phased Array technique we routinely carry out examinations on pressure vessels, on austenitic stainless steels and nickel alloys; we also perform automated inspections in pipe manufacturing plants, on both welded and seamless pipes. We also define and write the standard operating procedures. Our equipment has working frequencies between 1.5 MHz and 15 MHz, with linear, matrix and circular arrays.
- USED IN SEVERAL SECTORS
- STUDIED FOR EACH SPECIFIC ITEM GEOMETRY
- SINGLE-SIDE WELD ACCESSIBILITY IS ENOUGH
WE CAN INSPECT BY TOFD TECHNIQUE (TIME OF FLIGHT DIFFRACTION) THICKNESSES FROM 6 TO MORE THAN 300 MM.
The TOFD techniqueis based on wave diffraction caused by discontinuity apices and on processing
of radiofrequency signals, through the measurement of the time of flight.
The TOFD method needs two access points to the weld, i.e. the weld has to be accessible from both sides of the same surface.
Combining inspections by these two technologies, Phased Array and TOFD, brings a significant increase to detection sensitivity and sizing accuracy of flaws.
- BASED ON WAVE DIFFRACTION
- TWO POINTS OF ACCESS TO THE WELD ARE NEEDED
- SIGNIFICANT INCREASE TO DETECTION SENSITIVITY AND SIZING ACCURACY
HEAT TREATMENTS OF WELDED JOINTS
WE PERFORM LOCALIZED HEAT TREATMENTS ON LARGE ITEMS AND COMPLEX GEOMETRIES.
Electrical resistance heat treatments localized on welded joints are especially useful when items
cannot be oven treated. With this methodology it is possible to proceed by isolating a specific area
and applying heat through electrical resistances placed in contact with the material under treatment.
An appropriate instrument setup adjusts the electrical power and records the obtained temperatures.
We can fit the treatment to different geometries according to the standards applied by the customer.
We use cutting-edge equipment and our instruments are verified periodically according to AWS, ASTM and ISO standards.
Thermocouples are verified and certified by accredited calibration laboratories.
As a refractory material we use environmentally friendly ceramic fibers, and waste disposal is strictly controlled according to law.
We can perform heat treatments with recorded temperature tolerance of +/- 10° C.
Thanks to these guarantees of competence and service quality, our company has been qualified by GE Oil & Gas.
- ELECTRICAL RESISTANCE HEAT TREATMENTS LOCALIZED ON WELDED JOINTS
- CUTTING-EDGE EQUIPMENT
- INSTRUMENTS AND MATERIALS VERIFIED AND CERTIFIED BY CALIBRATION LABORATORIES
- ENVIRONMENTALLY FRIENDLY CERAMIC FIBER
WE PERFORM FIELD HARDNESS TESTING WITH PORTABLE INSTRUMENTS, BY BOTH TRADITIONAL METHODS (EQUOTIP, POLDI, UCI) AND MODERN BRINELL AND ROCKWELL PORTABLE DUROMETERS.
This kind of inspections has an increasing importance in many fields, among them the Oil&Gas sector,
e.g. in new NACE standard for components in sour service.
The Brinell technique, overall considered the most accurate methodology of hardness testing, is applicable to metallic items of small and medium size, with thicknesses starting from at least a few mm, composed of any alloy or metallic material.
Rockwell hardness portable instruments allow us to extend the test to large items, complex geometries and small thicknesses. We are then able to perform hardness testing directly in the field, on a large spectrum of finished components, before delivery to the end customer.
In respect to more traditional techniques like Poldi or Equotip, static indentation portable instruments are capable of measuring the hardness value with precision and reproducibility approaching those of fixed laboratory instruments, without sacrificing the flexibility of field testing.
- FIELD HARDNESS TESTING
- OIL&GAS SECTOR
- HARDNESS TESTING WITH PORTABLE BRINELL AND ROCKWELL INSTRUMENTS, DIRECTLY IN THE FIELD
WE OWN 3 GAMMAGRAPHIC INSTRUMENTS FOR COBALT-60 RADIOGRAPHY.
Using this radiographic source allows the inspection of large thicknesses. We can also perform the examination in difficult environmental conditions.
- COBALT CO-60
- INSPECTION OF LARGE THICKNESSES
We also perform traditional inspections, as:
- MAGNETIC PARTICLE INSPECTION
- EXAMINATION BY X-RAY EQUIPMENT
- COATING THICKNESS MEASUREMENT
- VIDEO BORESCOPE INSPECTION
- LIQUID PENETRANT TESTING, TRADITIONAL AND AUTOMATED
- GAMMAGRAPHY WITH IRIDIUM AND SELENIUM
- PMI (POSITIVE MATERIAL IDENTIFICATION) SPECTROSCOPY
- OES method (Optical Emission System), e.g. for carbon content
- XRF method (X-Ray Fluorescence)
- VISUAL EXAMINATION