NDT METHOD IN CHENNAI
ULTRASONIC THICKNESS GAUGING (UTG / UTM)
INTRODUCTION
An Ultrasonic Thickness Gauge is a Transit Time Measuring Device.
Used to find the thickness of a material.
PRINCIPLE
Pulse-Echo principle
How it works?
T/R Probe (Dual Element)
FORMULA
T = V * t / 2
Where,
V Velocity
t Transit time ( Time measured for one to & fro distance).
TEMPERATURE LIMIT
Below 93 degree Celsius (200 Fahrenheit)TESTING RANGE
1mm to 300 mm
AREA OF APPLICATION
Metals, plastics, ceramics, glass (or) virtually any other materials which satisfactorily conduct ULTRASOUND.
A major application of this gauge is for assessing wall thinning due to corrosion & erosion.
SOME TYPICAL APPLICATION
Heat Exchanger Tubing
Pressure Vessels
Casting
Forging
Boilers
Pipe/Tubing
Storage Tanks
Steam lines
ADVANDAGES
Does not require access to both side of the sample.
Good accuracy (0.1mm & less) can be achieved.
Digital UTM gives direct thickness on display.
DISADVANDAGES
Usually requires calibration for each material.
Requires good contact with the material.