Wall Thickness Measurements of Tubes by Internal Rotary Inspection System (IRIS) A Comparative Study with Metallography

摘要

Internal Rotary Inspection system (IRIS) is a relatively new ultrasonic system for inspection of heat exchanger/steam condenser tubes and pipe liens for measurement of wall thinning and pitting due to corrosion. The wall thickness measurements made during a scan around the circumference of the tube are displayed as a stationary rectilinear display of circumferential cross section (Bscan) of the tube. The paper describes the reuslts obtained on tubes of various materials used in process industries having corrosion on inner and outer surfaces of hte tube.