Rotary Dryer System

Precision Engineering Survey

A DATscan is a cold drum (performed when a rotary dryer or unit is shut down) engineering survey that measures system alignment. A DATscan gives you baseline measurements to inform your maintenance and repair decisions for your rotary equipment. Whether you’re preparing for a plant shutdown or in the middle of one, a DATscan is a great tool to help guide your next steps concerning your rotary unit. This precision engineering survey is checked three ways and boasts an accuracy of +/-0.040”.

Types of Measurements

Information included in the DATscan:

  • System Slope
  • Base Slope
  • Support Roller / Trunnion Shape
  • Tire / Roller Angle
  • Brief Visual Inspection

accuracy representation of rotary tire center

Cube at +/- 0.040″ represents the accuracy of rotary tire center, sphere are +/- 0.125″ represents the tolerance of the tire misalignment

When the DATscan is performed, each tire (tyre) / riding ring will be surveyed to establish a unit center point, horizontal misalignment, and unit slope. Support rollers / trunnions will be surveyed to establish their relationship to each tire and support roller / trunnion slope and one base at each pier will be surveyed for center reference points. Additionally, a brief visual inspection will be performed on the rotary unit to detect any noticeable problems and recommendations for adjustments will be made.

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How Does the DATscan Work?

The DATscan involves the use of optical instrumentation and specially designed software that communicates wirelessly with multiple tools to gather data. It is a cold drum survey engineering survey and the rotary dryer or rotary unit must be shutdown to perform this engineering service.

Why Schedule a DATscan?

Understanding a Float vs. a DATscan

Quick View of a Float vs. DATscan™


  • Alignment such as slope
  • Can determine roller coordinate system
  • Can get base slope information
  • Determine base settling if any
  • Determine diameters of tires and rollers
  • Compare coordinates to base centers


  • Referred to as skew, thrust Neutralization, or balancing a rotary unit
  • Makes sure the rollers give a balanced uphill thrust

datscan sphere

DatScan job at a distance
DatScan job close-up
DatScan worker viewing equipment