Phased array (PA) is widely used in several sectors, from power generation to construction industries. It is an advanced non-destructive testing (NDT) method that uses an ultrasonic technique to determine the component quality and detect failures such as flaws or cracks. Furthermore, Phased Array Ultrasonic Testing can be effectively used for wall thickness measurements in conjunction with corrosion testing. Its efficiency comes from the combination of many angles and focuses depths through to one probe which then performs several different inspections without the need for changing the transducer assembly. The inspection results are clearly stored and displayed for reporting. It can be used on standard and special materials like austenitic and high alloy materials.

PAUT Unit with Olympus, Zetec and Sonatest


Phased Array Ultrasonic Testing is an advanced application of ultrasonic testing technology. It can be used to inspect welds, detect cracks and flaws, measure thickness, and inspect for corrosion. A Phased Array can often be used instead of Radiographic Testing due to the detailed visualization of the defect size, shape, depth, and orientation. There is no need to create a safety zone because it is not hazardous to human nature, which usually means interrupting production.

Why convert from Conventional UT to Phased Array UT?

UT probes/transducers in traditional Ultrasonic Testing have a single or dual feature that generates ultrasonic sounds by transmitting and receiving ultrasonic waves into the material. However, Phased Array probes/transducers have multiple elements that transmit and receive the ultrasonic sound waves. The beam angle, focal point, and focal spot of the generated wavefront can be influenced by introducing a delay between the pulses of each element. As a result, Phased Array Ultrasonic Testing is a highly versatile method that can be applied to complex and arbitrary geometries.

Phased Array Ultrasonic Testing in UAEPhased Array provides auditable results on a daily basis due to its ability to collect and encode full volumetric data. As a result, Phased Array is a viable and cost-effective alternative to radiographic inspection and conventional ultrasonic testing. Furthermore, because there are no environmental risks, Phased Array inspections can increase project output by not displacing other crafts in the area, while also maximising on-site and personnel safety.

Phased Array Ultrasonic Testing (PAUT) for Boiler Tubes Inspection

As a key component of thermal power plants, boiler tubes are subjected to high-pressure steam flow. This means that inspecting boiler tube welds is critical to ensuring the safety of mission-critical operations.

Phased array ultrasonic testing (PAUT) has emerged as one of the most effective methods of non-destructive testing (NDT) of boiler tubes over time. This technique enables thorough inspections, which reduce downtime and promote thorough preventative maintenance. The high-speed testing process is specifically designed to fit challenging environments, as well as fewer spaces and a small footprint. AQUALIS Inspection Services has a specialized scanner and that can be used to inspect diameters ranging from 0.84 in. OD up to 4.5 in. OD. It accommodates up to two phased array probes in such limited clearance.

PAUT on Boiler Tubes - Aqualis Inspection Services UAE

In many industries, Advanced NDT Phased Array Ultrasonics (PAUT) Boiler Tube Inspection has almost become the standard. The ability to store a complete inspection record using the Phased Array UT Equipment with its “True to Geometry” visual display capability improves inspection understanding, which is one of the advantages of this NON-DESTRUCTIVE testing technology. With the inclusion of 3D imaging, the visual display of combined A-Scan, B-Scan, C-Scan, and S-Scan provides a simplified understanding of defect formation and related measurements.

Aqualis NDT Inspection Services is specialized in providing a complete range of advanced non-destructive testing (NDT) services. In addition to operating a competence center for advanced NDT based in the UAE, and we invest heavily in R&D and operates an accredited training school for advanced NDT as well as offering its expert services globally.

Phased Array Inspection Applications


  • Corrosion mapping
  • Detection of hydrogen-induced cracking (HIC), stress corrosion cracking (SCC), and stress-oriented hydrogen-induced cracking (SOHIC)
  • Weld inspection of pressure vessels, piping, and tubing
  • Vessels and piping fabricated with composite materials
  • Accurate sizing data for fitness-for-service (FFS) calculations

Power Generation

  • Turbine blades
  • Pressure vessel and piping welds
  • Erosion/corrosion mapping
  • Boiler Tube PAUT Weld Inspection
  • Nuclear Applications


  • Friction stir welds
  • Composite panels
  • Landing gear cylinders
  • Titanium billets, forgings, and castings


  • Simplified inspection of components that have complex geometry.
  • Variable material inspection can be done in quick manner.
  • High temperature inspections possible up to over 350°C.
  • Speedy inspection compared to conventional ultrasonic testing.
  • Higher probability of problem detection on testing from multiple angles with a single probe.
  • All inspection data presented in an understandable graphic format.
  • Aqualis have well qualified operators, certified to ISO 9712/PCN/ASNT & ASME Sec-V Trained operators.
  • Inspection of many different materials possible.