Flow Measurement of Highly Viscous Coker and Visbreaker Feed In a typical complex refinery operation, residues or other high viscosity liquid streams (VTBs) from the Vacuum Distillation Columns are fed into cokers and/or visbreakers for further processing. The flow of these hot liquids (up to 700 °F) is difficult to measure and together with their viscous and sticky nature, traditionally intrusive measurement technologies are often ill-suited. Under these very severe process conditions, impulse line clogging and vortex shedder breakdowns are frequent. High maintenance costs or even process shut downs are the consequences. In a North American refinery, a differential pressure measurement was replaced without any process interruption with FLEXIM's non-intrusive WaveInjector, eliminating dail

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