Page 1
Section No. Reference No. OPERATION & MAINTENANCE SPECIFICATIONS MANUAL Section: Subject: EQUIPMENT/TOOLS ULTRASONIC THICKNESS MEASUREMENT SCOPE This section is intended for the guidance of NDE personnel qualified in accordance with the requirements of M&NP “Training and Qualification of Personnel”. The inspection processes and procedures described in this document may be used for line pipe, piping components and pressure vessel plates.
Section No. Reference No. OPERATION & MAINTENANCE SPECIFICATIONS MANUAL Section: Subject: EQUIPMENT/TOOLS ULTRASONIC THICKNESS MEASUREMENT The INITIAL SET UP procedure is accessed by holding the CAL key down and pressing the ON/OFF key. When this is done the T-Mike E will display the version code of the operating software contained in the unit until the CAL key is released.
Page 4
Section No. Reference No. OPERATION & MAINTENANCE SPECIFICATIONS MANUAL Section: Subject: EQUIPMENT/TOOLS ULTRASONIC THICKNESS MEASUREMENT 3. Material Calibration to Known Thickness The following procedure is used to calibrate the T-Mike E sound velocity to a known sample of material. Some materials may exhibit sound velocity variations which can cause errors in measurement. Be sure to check a representative group of samples to determine if such variation is present.
Page 5
Section No. Reference No. OPERATION & MAINTENANCE SPECIFICATIONS MANUAL Section: Subject: EQUIPMENT/TOOLS ULTRASONIC THICKNESS MEASUREMENT IN /µ s . 2 3 3 0 Or if metric units are selected: m / s 5 9 1 8 Use the UP and Down arrow keys to scroll to velocity to the known velocity of the material. Note that when these keys are held continuously, the speed that the velocity changes will increase, making it easy to make the large adjustments for materials such as plastic and aluminum.
Page 6
Section No. Reference No. OPERATION & MAINTENANCE SPECIFICATIONS MANUAL Section: Subject: EQUIPMENT/TOOLS ULTRASONIC THICKNESS MEASUREMENT The T-Mike E will display the thickness of the material and the appropriate units of measure (inches or millimeters). NOTE: If the detected echo is of marginal magnitude a question mark? Will appear to the left of the echo indicator.
Section No. Reference No. OPERATION & MAINTENANCE SPECIFICATIONS MANUAL Section: Subject: EQUIPMENT/TOOLS ULTRASONIC THICKNESS MEASUREMENT T-MIKE PROGRAMMABLE 1. Configuration and Calibration The T-Mike Programmable is preset to display in inches or millimeters; the back light enabled or disabled; and the sound velocity fixed. This can be done at the factory prior to shipping or this may be done by connecting the T-Mike programmable to an IBM compatible computer running special software, or from a T-Mike E.
Section No. Reference No. OPERATION & MAINTENANCE SPECIFICATIONS MANUAL Section: Subject: EQUIPMENT/TOOLS ULTRASONIC THICKNESS MEASUREMENT When you turn off the T-Mike Programmable, it will display the EPROM software version. When you turn on the T-Mike Programmable, it will momentarily display the calibrated sound velocity. Test the T- Mike Programmable on a material sample to verify that it reads the correct thickness.
Section No. Reference No. OPERATION & MAINTENANCE SPECIFICATIONS MANUAL Section: Subject: EQUIPMENT/TOOLS ULTRASONIC THICKNESS MEASUREMENT the LCD will indicate the velocity. Now turn on the T-Mike B. The T-Mike B should display CAL, followed by the new velocity and then will go into the measurement mode. Be sure this new velocity matches with the sound velocity in the T-Mike E.
Page 10
Section No. Reference No. OPERATION & MAINTENANCE SPECIFICATIONS MANUAL Section: Subject: EQUIPMENT/TOOLS ULTRASONIC THICKNESS MEASUREMENT 3. Material Consistency Maximum measurement accuracy will be contained if the work piece and the calibration piece are the same temperature, shape, material, and size. NOTICE Since velocity of sound varies from test piece to work piece, accuracy of measurement depends on consistency of ultrasonic velocity.