ASME MFC-11:2006 pdf free download

ASME MFC-11:2006 pdf free download.Measurement of Fluid Flow by Means of Coriolis Mass Flowmeters.
density calibration factor(s): calibration factor(s) associated with density measurement.
drive system: means for inducing the oscillation of the tube(s).
flashing: the formation of vapor bubbles in a liquid when the local pressure falls to or below the vapor pressure of the Liquid, often due to local lowering of pressure because of an increase in the liquid velocity. See also caz’rtation.
flow calibration factor(s): calibration factor(s) associated with mass flow measurement.
flow sensor: a mechanical assembly consisting of an osci1- lating tube(s), coil drive system, oscillating tube deflection measurement-sensor(s), flanges/fittings, and housing.
Iwusing: environmental protection of the flow sensor.
oscillating tube(s): tubes(s) through which the fluid to be measured flows.
rangeability: Coriolis flowmeter rangeability is the ratio of the maximum to minimum flowratcs or Reynolds number in the range over which the flowmeter meets a specified uncertainty and/or accuracy.
repeatahilit of iiseasurcncnt (qualitative): the closeness of agreement among a series of results obtained with the same method on identical test material, under the same conditions (same operator, same apparatus, same laboratory, and short intervals of time),
repeatability of measuremeiit (quantitative): the value below which the absolute difference between any two single test results obtained under the same conditions, Isce rcpeatai’ility of measinrnwzt (qualitatirie)J, may be expected to lie with a specified probability. In the absence of other indications, the probability is 95%.
reproducibility (quantitative): the closeness of agreement between results obtained when the conditions of measurement differ; for example, with respect to different test apparatus, operators, facilities, time intervals, etc.
NOTE: The following three paragraphs are included to help with understanding the definitions of repeatability and reprududhility.
(a) Repeatability is a quantified measure of the shun term stat’ility of a flow meter. Repeatability can be determined from successive tests of the meter, over short periods of time, without changing 11w test conditions. Repeatability can be quantified in terms of the
standard deviation or the max/mm, differences in these results
(b) keproducibility is a quantified nwaure of the longer-term stability of a flownwter. Reproducibility can be determined from tests of the meter, over longer (specified) periods of time, or when test conditions may change (changes to be specified); such as the typical metcr-uagc patterns aa turning the meter off and then turning it back on, or tesing it on successive days. Reproducibility can be quantified in terms of the standard deviation or the max/mm. diffennces in these results.
(c) Resultant difkrunces for reproducibility may be larger than their repeatahilities because oI the test conditions.
secondari containment: housing designed to provide protection to the environment if the oscillating tubes) fail.
traus,nitfrr: electronic system providing the drive and transforming the signals from the flow sensor to give output(s) of measured and inferred parameters; it also provides corrections derived from parameters such as temperature.
uncertainty (of ,neasurc,nent): the range within which the true value of the measured quantity can be expected to lie with a specified probability and confidence level.
zero stability: maximum expected magnitude of the Conohs flowmeter output at zero flow after the zero adjustment procedure has been completed, expressed by the manufacturer as an absolute value in mass per unit time.
2.2 Definitions Specific for This Document
base conditions: specified conditions to which the measured mass of a fluid is converted to the volume of the fluid.
error: the difference between a measured value and the “true” value of a measurand.
NOTE: The “true’ value cannot usuall be determined. In practhe, a conventional recognized “standard” or “reference” value is typically used instead.
installation &ct: any difference in performance of a component or the measuring system arising between the calibration under ideal conditions and actual conditions of use- This difference may be caused by different flow conditions due to velocity profile, perturbations, or by different working regimes (pulsation, intermittent flow, alternating flow, vibrations, etc.).
linearity: the consistency of the change in the scaled output of a Coriolis flowmeter for a related scaled change in the input of the flowmeter.
masfrrflowmeter: a flowmeter calibrated with a primary flow reference and used as a secondary or transfer reference to calibrate other flowmeters.