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Introduction to Remote Field Testing

Introduction

Theory of Operation

Theory (cont,) - The Zones

Probes

Instrumentation

Signal Interpretation

Reference Standards

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RFT Reference Standards

Reference standards for the RFT inspection of tubular products come in many variations. In order to produce reliable and consistent test results, the material used for manufacturing calibration standards must closely match the physical and chemical properties of the inspection specimen. Some of the important properties that must be considered include conductivity, permeability and alloy content. In addition, tube dimensions including I.D., O.D. and wall thickness must also be controlled.

The type of damage mechanisms that are expected to be encountered must also be carfully considered when developing or selecting a reference standard. In order to get accurate quantitative data, artificial discontinuity conditions are typically machined into the standards that will closely match those conditions that may be found in the tubing bundle.