PICA offers a wide range of handheld electromagnetic (EM) scanning tools to detect and measure wall loss in metallic pipes. We also can provide versions that are used to inspect the condition of reinforcing bars and prestressing wires in concrete pressure pipes. Our low-frequency EM tools can be used on either the inside or the outside of the pipe. The scan width is either 10 inches (external) or 24 inches (internal) at speeds of up to 3 fpm. A magnetic wheeled robotic version and a version that inspects corrosion under insulation (CUI) are available.
PICA uses handheld ultrasonic thickness (UT) probes to quantify wall loss in metallic pipes. Standard UT probes used by PICA on bare pipe can also be sold for purchase by the customer. Electromagnetic acoustic transducer (EMAT) probes can measure wall thickness through a coating or insulation without the need for a couplant.
UT and EMAT Probes
Spot UT measurements are often used by PICA and our customers to accurately measure wall loss in metallic pipes at discrete locations. This can include using a UT probe to validate wall loss data collected through our Remote Field Testing (RFT) or Bracelet ProbeTM inspections.
UT works by transmitting a directional sound burst at regular intervals and waiting for an echo to be returned from a boundary of different material, such as air. The speed of sound is predictable; therefore, the interval between the transmitted and returned echo can be timed, allowing for the accurate measurement of thickness and position of flaws within the material being tested.
If a spot UT thickness measurement is to be used, it must be considered that UT is very directional and will only measure the material directly under the transducer; it can miss a more severe thickness loss just a fraction of an inch away.
- Can be used in conjunction with PICA’s Bracelet ProbeTM to quantify wall loss.
- Can be used to validate wall loss data from PICA’s RFT tools.
- Can measure wall loss through bare or coated/insulated pipe.
- EMAT is better for use with cast iron pipe and ductile iron pipe.