Overflash Mass Flow Measurement The overflash volume in atmospheric distillation is an important indicator for effective and well balanced operation of the distillation column. A precise measurement of this quantity poses a special challenge. Driven only by gravity, the medium moves at very low flow velocities of around 0,45 ft/s, with a maximum flow rate of 10 tons/hr. Therefore, in order to reach a reasonable accuracy, the previously installed orifice plates had very small diameters. This resulted in a high pressure loss which could almost not be overcome by the hydrostatic conditions. Another challenge for the measuring system was the high medium temperature of around 720 °F. After successful testing, a flow measuring system using FLEXIM's WaveInjector was installed at the measuring poi

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