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Flow Measurement in Bitter Cold

By Tim Patten and Keven Dunphy, Emerson Process Management |

The usage of Coriolis flowmeters for measuring mass flowrates has become widespread in the chemical process industries, and the range of fluids with which these meters can be employed is likewise diverse. Among those applications, Coriolis flowmeters can readily be applied to cryogenic fluids (contrary to conventional flow-measurement practice with these fluids), provided that the measurement system is set up and used appropriately. Although the guidelines and recommendations presented below are based upon research and field testing of the products offered by the authors’ employer, the information should also be useful to operation of other Coriolis flowmeters unless otherwise indicated. Coriolis flowmeters measure mass flow by taking advantage of the Coriolis Effect. Simply stated, the inertial effects that arise as a fluid flows through a tube are directly proportional to the mass flow of the fluid. In a Coriolis flowmeter, vibration is induced in the process-fluid-filled flow tube(s), then the mass flowrate is captured by measuring the difference in the phase of vibration between one end of the flow tube and the other. For purposes of this article, cryogenic fluids are fluids that are handled in liquid form at temperatures below…
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