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ASME MFC-11-2006 pdf download

ASME MFC-11-2006 pdf download.Measurement of Fluid Flow by Means of Coriolis Mass Flowmeters.
1 SCOPE ASME MFC-11 establishes common terminology and gives guidelines for the selection, installation, calibra- tion, and operation of Coriolis flowmeters for the deter- mination of mass flow, density, volume flow, and other parameters. Thecontentofthis Standardis applied to the flow measurement of liquids, gases, mixtures of gases, multiphase flows, and miscible and immiscible mixtures of liquids. 2 TERMINOLOGY, SYMBOLS, REFERENCES, AND BIBLIOGRAPHY Paragraph 2.1 lists definitions from ASME MFC-1M used in ASME MFC-11. Paragraph 2.2 lists definitions specific to this Standard. Paragraph 2.3 lists symbols (see Table 2.3) used in this Standard (see notes and superscripts). Paragraph 2.4 lists abbreviations (see Table 2.4) used in this Standard. Paragraph 2.5 lists references used in this Standard and a bibliography. 2.1 Definitions Copied From ASME MFC-1M accuracy: the degree of freedom from error, the degree of conformity of the indicated value to the true value of the measured quantity. calibration: (a) the process of comparing the indicated flow to a traceable reference standard (b) the process of adjusting the output of a device to bring it to a desired value, within a specified tolerance for a particular value of the input. cavitation: the implosion of vapor bubbles formed after flashing when the local pressure rises above the vapor pressure of the liquid. See also flashing. Coriolis flowmeter: a device consisting of a flow sensor and a transmitter which measures the mass flow by means of the Coriolis force generated by flowing fluid through oscillating tube(s); it may also provide measure- ments of density and temperature. cross-talk: if two or more Coriolis flowmeters are to be mounted close together, interference through mechani- cal coupling may occur. This is often referred to as cross- talk. The manufacturer should be consulted for methods of avoiding cross-talk. 1 density calibration factor(s): calibration factor(s) associ- ated 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 cavitation. flow calibration factor(s): calibration factor(s) associated with mass flow measurement. flow sensor: a mechanical assembly consisting of an oscil- lating tube(s), coil drive system, oscillating tube deflec- tion measurement-sensor(s), flanges/fittings, and housing. housing: 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 flowrates or Reynolds number in the range over which the flowmeter meets a specified uncertainty and/or accuracy. repeatability ofmeasurement (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 labo- ratory, and short intervals of time). repeatability ofmeasurement (quantitative): the value below which the absolute difference between any two single test results obtained under the same conditions, [see repeatabilityofmeasurement (qualitative)], 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 mea- surement 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 reproducibility. (a) Repeatability is a quantified measure ofthe short term stabil- ityofa flowmeter. Repeatabilitycanbe determined fromsuccessive tests of the meter, over short periods of time, without changing the test conditions. Repeatability can be quantified in terms of the standard deviation or the max./min. differences in these results.

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