Bolt Inspection

Bolting, like any other structural component, is susceptible to degradations such as corrosion wastage and cracking. Compromised retainers, such as bolting, can cause uneven stresses and possible catastrophic failure of flanged connection as well as suspected structures like bridges, flare stacks, and process columns. In order to comply with safety regulations and to maintain structural integrity, it is required for structural and pressure retainer bolting to be inspected on a periodic basis. If found defective, continued monitoring and/or replacement may be required.

Visual Inspection and hammer-testing will not discover hidden problems such as crevice corrosion, uniform corrosion at moisture/air interface (necking-down), or cracking that has initiated at the thread base under the retainer nuts or structure base.

Advanced Bolt Inspection provides a practical solution for performing corrosion and crack detection and subsequent monitoring of bolts, threaded studs or shafts. ABI can determine the extent of corrosion or diameter loss and identify cracking without the removal of bolts, thus eliminating equipment downtime by performing inspections on site while bolting is installed.

The Advanced Bolt Scanner is a Phased Array Ultrasonic system using encoded orbiting scanner that provides a practical solution for corrosion monitoring and crack detection. It provides clear images showing bolt shank and thread condition. Inspection is performed without removal of the bolts or studs, thus eliminating downtime and enabling on-site inspection. Access to only one side of the bolting is needed for complete testing of the entire bolt saving time and allowing inspection of inserted studs. Since the scanner is encoded it allows for accurate repeatable inspections for future monitoring of known defects that are discovered.

Advantages of Asset Integrity Management:

  • Gives immediate feedback on the condition of the bolt
  • Allows groups of bolt into categories: No Corrosion, Minor, Moderate & Severe
  • Allows integrity groupings: Cracked versus no cracking noted
  • Decision can be made on-site regarding placement
  • Data can be identified for further analysis and reporting
  • The different scanner diameter allows for scanning variety of sizes

Quality, Innovation & Service from One Company

Advanced Corrosion Technologies and Training has quickly become one of the fastest growing Non-Destructive Testing (NDT) Service Companies around.