Patent ID: 8413474

Claim:
A monitoring apparatus of seamless pipe or tube production conditions in a piercing-rolling mill for piercing and rolling a billet to produce a pipe or tube, comprising: an ultrasonic thickness meter which is installed on an exit side of the piercing-rolling mill and measures a thickness of the pipe or tube produced by the piercing-rolling mill, a thermometer which is installed on the exit side of the piercing-rolling mill and measures a surface temperature of the pipe or tube produced by the piercing-rolling mill, and a computing and displaying device which is connected to the ultrasonic thickness meter and the thermometer and displays a thickness distribution in a circumferential direction of the pipe or tube based on the thickness of the pipe or tube measured by the ultrasonic thickness meter, and a surface temperature distribution in a circumferential direction of the pipe or tube based on the surface temperature of the pipe or tube measured by the thermometer.