Q PROCESS INSTRUMENTATION CH. 5 KEY TERMS TEST A. Rotameter B. Volumetric flow units C. Differential pressure D. Turbulent flow E. Electromagnetic flow meters. F. Orifice flanges G. Flow nozzle H. Flow rate I. Fluid J. Laminar Flow K. Mass Flow meters L. Flow measurement M. Mass Flow Unit N. Orifice plate O. Percentage flow rate P. Percentage flow rate Q. Positive displacement flow measurement R. Positive displacement meters S. Reynolds number T. Rotameter U. Turbine meter V. Indirect flow measurement 1.__-a direct read variable area (tapered) flow tube in which fluid enters through the bottom, then flows upward, lifting a free floating indicator plummet (float); the position of the float against the calibrated marks on the glass tube; indicates flow rate. 2.__-a unit of measure for the volume being passed through a certain location in a pipe or channel per unit of time; usually measured in gallons per minute and cubic feet per minute. 3.__the difference between two related pressure measurements, usually used in measurements of process variables (pressure, temperature, level, and flow). 4.__-a condition in which the fluid flow pattern is disturbed, so there is considerable mixing, p. 90. Venturi tube-a primary element used in pipelines to create a differential pressure (D/P) such that when converted to flow units (e.g., GPM), the flow in the line 5.___-magnetic flow meters designed to determine volumetric flow of electrically conductive liquids, slurries, and corrosive and/or abrasive materials. 6.__-flanges with holes drilled in them through to the pipe to allow pressures upstream and downstream of an orifice plate to be measured. 7.__-device similar to a Venturi tube but with an extended tapered inlet commonly installed in a short piece of pipe called a spool piece, p. 94. 8.__-the specific amount of fluid moving past a given point per unit of time, usually expressed in volume units per unit of time, such as gallons per minute(GPM) or cubic feet per minute (CFM), p. 89. 9.__-substances, usually liquids or vapor, that can be made to flow Indirect flow measurement-measuring one variable of a process to infer another 10.__-flow condition in which fluid flow is smooth and unbroken; viewed as a series of laminations or thin cylinders of fluid slipping past one another inside tube 11.__-a meter that eliminates the need to compensate for typical process variations such as temperature, pressure, density, and even viscosity; the most common type of true mass flow meter is the Coriolis 12.__-flow rate (an instantaneous flow measurement) and total flow accumulation (a summation of instantaneous flow rates over a time interval or an of counts provided by a positive displacement device); measured in volume or mass units without respect to time 13.__--a unit of measure for the weight being passed through a certain location per unit of time; usually expressed in pounds per unit of time, as in pounds per minute 14.__-a piece of in. to 1 in thick metal with a calibrated hole drilled(or cut) through it; types of orifice plates include the concentric plate, eccentric bore, and segmental plate. 15.__-a common way to indicate a flowing process, with 100 percent equating to an actual quantity such as specified gallons per minute (GPM) 16.__ an L-shaped tube that is inserted into a pipe with its open end facing the flow and another tube sensing static pressure 17.__-measurement of flow in absolute volumes where the flowing material is admitted into a chamber of known volume and then transferred to a discharge point; a counter registers the number of times the chamber fills and discharges, 18.___-piston, oval gear, nutating disk, and rotary vane types of positive displacement flow meters 19.__-a mathematical computation describing the quality of the flow of fluids numerically. 20.__-a direct read variable area (tapered) flow tube in which fluid enters through the bottom, then flows upward, lifting a free floating indicator plummet (float); the position of the float against the calibrated marks on the glass tube; indicates flow rate. 21.__-a flow tube containing a free spinning turbine (fan) wheel where the revolutions per minute (rpm) are proportional to flow. 22.__-a multiport tube having four impact points spaced across the pipe and facing the flow, with another tube sensing static pressure; measures the average pressure produced by the four impact points; common brand name Annubar Indirect flow measurement 23.__-measuring one variable of a process to infer another PreviousNext