Pipe Elbow Thickness Measurement Scanner

The PET scanner offers a versatile and portable inspection solution for mapping wall thickness reduction, due to corrosion and erosion, in both straight pipes and around pipe elbows. It can be configured to operate on all standard pipe sizes from 4” to 24” OD.

At the core of the PET scanner is a motorised single-axis magnetic crawler to traverse along the length of a pipe and a trailer module provides the motorised circumferential drive. A ring segment is driven by the trailer module, rotating through 180°. Utilising two transducers; mounting one at each end of the ring segment, provides 360° surface coverage in a single movement. On pipe elbows, where only the outer surface requires inspection, a single transducer is mounted in the centre of the ring segment to provide a single scan of the extrados area.

The height profile of the inspection ring and transducer holder has been minimised to allow the PET scanner to operate in areas with clearance of just 80mm.

The PET scanner inspection solution is capable of inspecting all pipe sizes using conventional or phased array probes. The transducer holder is spring-loaded and conformable to keep the transducer aligned and in contact with the pipe whilst scanning over the changing geometry.

The transducers mount centrally within the holder and can be manufactured to suit the pipe thickness. Profiled magnetic wheels to suit the pipe diameter ensure accurate tracking around the pipe.

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Pipe Elbow Thickness Measurement Scanner

Standard Kit

  • Motorised dual-axis magnetic crawler
  • Contoured wheels
  • Trailer module with motorised circumferential drive
  • Spring loaded waterproof wheel encoder. IP68 rated
  • Ring segment with slide assembly
  • Low-profile toolpost assembly
  • Spring-loaded transducer holder
  • Umbilical cable for motors, encoders and UT data



Minimum Pipe Size4″
Maximum Pipe Size24″ or flat
Radial clearance above transducer1.5x OD
Radial clearance above scanner120mm (straight pipe)
160mm (pipe elbow)
Scanner length600mm
Axial scan coverageUnlimited (10m cable)
Circumferential scan coverage370° on straight pipe
190° on pipe elbows
Position repeatability<3mm
Maximum axial speed10mm/s
Maximum circumferential speed25mm/s
Motor type24V, 1A
Primary scanning axisCircumferential
Transducer size30mm x 30mm
Temperature range10°C – 50°C


  • Versatile: Inspects pipe sizes from 4” to 24” OD
  • Comprehensive: Provides dual axis fully encoded C scan
  • Adaptable: Corrosion Mapping; 370° scan coverage of straight pipes and 190° on pipe elbows
  • Fast: Most efficient method to map a pipe bend
  • Compatible: With leading manufacturer’s flaw detectors

Downloads and Documentation