C1 SPIDER TANK CRAWLER At At Horizon Testing Inc. we have invested in the ScanTech C1 Spider tank crawler. The C1 Spider tank crawler is a Windows computer controlled ultrasonic inspection crawler system system that is designed to continuously scan tank wall thickness as it moves up the wall. GENERAL THEORY The operation principle of the system is based upon the ultrasonic pulse-echo technique for measuring wall thickness commonly used in hand held thickness instrument meters. A transducer converts a pulse of electrical energy into ultrasonic sound vibration. The The pulse is a longitudinal wave known as a straight beam that travels perpendicular through the water to the tube wall. A small part of the energy is transmitted through the tube wall wall and is reflected off the back wall then back to the transducer. GENERAL DESCRIPTION The The C1 Spider Tank Crawler System uses a pulse echo single or dual transducer that transmits sound waves through the tank wall to determine the wall thickness. The transducer measures as it continuously scans and advances up on the tank wall. The thickness is recorded as the tank is scanned and generates a “B” scan graph. The software allows the Technician to continually view the A, B scan during the acquisition process. A report feature allows the users to create a completely custom report of any length using using a drag and drop interface. C1 Spider Tank Crawler And Analyst D2S Dryer Scanning System C1 Spider Typical sound wave propagation The C1 Spider Near The Top Of a Tank C1 Spider Tank Crawler