Calibration in NDT EquipmentDi sampaikan pada Seminar GMF, 24 November 2009

Six Most Common NDT Methods Visual Eddy Current Ultrasonic Magnetic Dye Penetrant Radiography

Visual InspectionMost basic and common inspection method.

Tools include fiberscopes, borescopes, needs calibration on the tips for measurement accuracy

Visual CalibrationVerification Block 4 Measurement Targets on each Block:Forward StereoSide StereoForward ShadowSide Shadow

Each target allows a distance measurement of 0.1 Inch or 1 MM. Traceable to NIST Standards

Eddy Current Testingmagnetic field Crack detection Coating thickness measurements Conductivity measurements

EC Calibration

Ultrasonic Inspection (Pulse-Echo) High frequency sound waves are introduced into a material and they are reflected back from surfaces or flaws.

Reflected sound energy is displayed versus time, and inspector can visualize a cross section of the specimen showing the depth of features that reflect sound and need calibration for horizontal linearity.

Ultrasonic Inspection with Normal Probe

Ultrasonic Inspection with Angle Probe

UT Calibration Display Quality of MeasurementHorizontal LinearityScreen Height LinearityAmplitude Control Linearity

Traceable to ASTM E-317 and ASME V Standards

Magnetic Particle Inspection

MT Calibration Performance Quality of MeasurementLifting 10 40 LbsAmmeter readingTime exposure

Traceable to ASME V Standards

Dye Penetrant InspectionStep 1. Pre-CleaningEnsure surface is very Clean normally with the use of a solvent

Dye Penetrant InspectionStep 2. Apply penetrantAfter the application of the penetrant the penetrant is normally left on the components surface for approximately 15 minutes (dwell time). The penetrant enters any defects that may be present by capillary action

Dye Penetrant InspectionStep 3. Clean off penetrantAfter sufficient penetration time (dwell time) has be given the penetrant is removed, care must be taken not to wash any penetrant out off any defects present

Dye Penetrant InspectionStep 3. Apply developerAfter the penetrant has be cleaned sufficiently a thin even layer of developer is applied. The developer acts as a contrast against the penetrant and allows for reverse capillary action to take place

Dye Penetrant Inspection

PT CalibrationSupport Performance Quality of CalibrationBlack LightUV meterDwell timer

Traceable to ASME V art. 7 Standards

Radiography InspectionX - RaysElectrically generatedGamma RaysGenerated by the decay of unstable atoms

Radiography Inspection

RT CalibrationSupport Performance Quality of CalibrationFilm DensitometerLux meterSurvey meter

Traceable to ASTM E-1079 Standards (densitometer)