1. Big Oil and Gas Pipe and tube detection---Ultrasound ... 128 or more channels 3. ultrasonic flaw detect 1. Big Oil and Gas Pipe and tube detection---Ultrasound 2. ... be widely used for titanium tube, zirconium tubes, book-walled pipe, seamless steel tubes, welded gas and oil pipelines, nonferrous metals ... color represents.SA,PA,RA,%Real-time display Big Oil and Gas Pipe or tube detection---Ultrasound