Computed Tomography

Enhanced visualization through the use of computed tomography is offered with ScanTech’s CAT Scan service. This techniques provides a 2-Dimensional view through 360 degrees of the vessel at a specific height or location. The final output is a coloured density map of the area inside the vessel or pipe.

Fan_Beam_DensityThe CAT Scan is a specialized service that is usually used to provide additional information to the Gamma Scan on a packed tower. Locations for the CAT Scan are chosen based on the results of the Gamma Scan tests. The CAT Scan requires more equipment and time to perform as well as access around the vessel at the elevation to be scanned.

The CAT Scan may be used to determine annular maldistribution in packed beds or small reactors. When used on piping it is possible to view density differences if different liquids and gases are flowing in the pipe. It also displays the deposit regime on the inside of the piping at that location.

CAT Scanning Procedure

CatScanThe CAT Scan is performed by mounting an array of detectors at a specific elevation on the exterior of the vessel. A gamma ray source is mounted on the opposite side of the vessel to the detectors. The density reading is taken at each detector in this position.

The source and detector network is then rotated through a specific angle before taking another density reading. This is repeated until the equipment has rotated through 360 degrees on the vessel.

The CAT Scan data is processed using our custom software package to obtain a 2D density map of the inside of the vessel. If additional CAT Scans are required the equipment may be moved to the next elevation and the process repeated.

The resolution available in the density map is dependent on the number of samples taken during the testing.

Equipment We Monitor

Jaret in BRScanTech provides the specialized CAT Scan service to assist our customers with the following:

  • packed tower maldistribution
  • solid and liquid identification in pipelines
  • FCCU riser catalyst distribution
  • profiling tower internals
  • 2 Dimensional density profiling of vessels


Tower PackingScanTech provides the specialized CAT Scan service to assist our customers with the following:

  • Access at scan height
  • Access around vessel
  • Small to Large diameter
  • Internals or packing
  • Vessels and Piping
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