Paper Machine Dryer Inspections

  We have extensive experience in the inspection of paper machine dryers and have developed procedures and equipment specific technologies to address these particular needs. Paper machine dryer inspection is actually the combination of different method techniques applied to specific components of the dryer assembly. One or more of the following examinations or combinations thereof can be performed in accordance with client specifications.

Shell Thickness

  Ultrasonic Thickness data of the dryer shell is obtained using our Mustang© Crawler system which determines the actual material velocity in sequence with the acquisition of thickness data assuring optimum accuracy when examining cast dryer shells. The data is acquired in a continuous scan of the shell and the report presents both velocity and shell thickness data along the length of the dryer shell.

  The remote controlled magnetic crawler enables data acquisition without having to physically traverse the dryer section resulting in a safer, more rapid examination.

Dryer Head Capscrews (Bolts)

  Dryer head capscrews (bolts) are inspected using a manual ultrasonic soundness technique where a sample bolt is notched to provide a reference standard and each bolt or a sampling of the bolts are individually subjected to an ultrasonic examination that will detect significant cracking or discontinuities in the bolt.

Dryer Heads

  The cast heads of the dryer cans are typically designated as drive side or tending side based upon their location. Radii, bolt rings, manways, lettering and journals are potential areas for cracking. A magnetic particle examination is performed to detect relevant linear indications that could be detrimental to the integrity of the dryer.

Internal Inspection

  An internal visual examination is performed to detect any mechanical damage or other anomalies that may be present. Siphons, counterweights, and other attachments are checked for tightness, positioning and wear. Physical measurements are made of any pits, grooves, water depth, or erosion detected. Photography is often employed to document any findings. Magnetic Particle examination is sometimes prescribed to investigate internal surfaces as well.