Refinery & Petrochemical

Refinery & Petrochemical

Magnetic Flux Leakage Technique (MFL)

Another electromagnetic technique that is applied to small-bore ferromagnetic heat exchangers made from carbon steel. An MFL probe consists of a magnet with a coil type and Hall element pickups. Coil type identifies the rate of change of flux and detects small defects that cause perturbations; the rate of change inducing an output voltage read by the probe. The Hall element picks up absolute flux with its sensor detecting gradual wall loss. Additionally it can be used for sizing wall loss flaws.

Ultrasonic Iris Technique (IRIS)

This internal rotary inspection system measures thickness using ultrasonic waves. The probe consists of an ultrasonic transducer that is lined up to the centreline of the tube and to a rotating mirror. The mirror reflects the beam in the radial direction as it rotates in the tube. As the probe is pulled along the tube it scans the entire internal circumference. Frequently used for carbon steel tubes IRIS is sometimes used with non-ferromagnetic tubes for defect verification. A highly accurate technique for thickness measurement, IRIS will not identify pinholes and cracks.

Near Field Testing (NFT)

NFT (Near Field Testing / Fin Fan application) Inspection of Ferrous material such as: Ferrous materials such as: SA-214, SA-179, SA-213-T11

All five techniques available from one platform with the addition of enhanced software reporting capabilities.

Above Ground Storage Tank Inspection (AST)

Our “AST Center of Excellence” provides comprehensive tank testing programs adhering to API-653 in service and out of service inspections guidelines, and our customized non-intrusive tank inspection program that allows owners to determine the relative condition of their storage tanks without entering the asset.

API-653 inspections are performed using the following inspection techniques:

  • In Service and Out of Service Visual Inspection
  • Ultrasonic thickness readings
  • Ultrasonic Corrosion Surveys of tank shells and roofs
  • Magnetic Flux Exclusion (MFE) testing of tank floors
  • Ultrasonic Prove up of indications found during MFE testing for volumetric determination
  • Tank Strapping
  • API 653 calculations including safe fill height
  • Edge Settlement

All of our API-653 inspections utilize our electronic reporting system allowing the rapid generation of field tank reports, on site. Most reports are fully complete by the time the crew demobilizes from the job site. MISTRAS Services also provides tank project coordinators that are responsible for the oversight of the tank project from the time product has been removed from the tank until the tank has been filled and turned over to operations for continued use. This allows us to ensure the proper cleaning has been performed prior to inspection crews mobilization, therefore ensuring the effective use of all resources during the project.

TankPAC is a surveying tool for assessing the tank bottom condition in Above Ground Storage Tanks (AST). This in-service test utilizes AE transducers mounted on the outside of the tank wall to listen to the active corrosion inside the tank. With the test results, the owner/operator can determine whether it is feasible to open the tank for decontamination and internal inspection. This method is also suitable for detecting and locating active leaks.

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