The Bundled Waveguide Transducer (BWT) System, a technological innovation in ultrasonic flow measurement, is the key for flow measurement in Liquified Natural Gas (LNG) in large pipes. The robust BWT System is the proven solution for cryogenic LNG applications, including the outlet of liquefaction trains and off-loading from ships to storage tanks. In addition to these low-temperature applications, the BWT System is the leading technology for measuring liquids in extreme conditions, including high-temperature, low-density and high-temperature, and highly viscous liquids. Although the installation is wetted, BWT transducers are obstructionless, producing no pressure drop or flashing in the system. The BWT System is compatible with most GE Sensing Panametrics liquid or gas ultrasonic flowmeters. Installations last virtually forever since there are no moving parts.