ASME MFC-11 pdf download

ASME MFC-11 pdf download.Measurement of Fluid Flow by Means of Coriolis Mass Flowmeters.
ASME MFC-ll establishes common terminology and gives guidelines for the selection, installation, calibration, and operation of Coriolis flowmeters for the determination of mass flow, density, volume flow, and other parameters. The content of this Standard is 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-IM used in ASME MFC-l1.
Paragraph 2.2 lists definitions specific to this Standard.
Paragraph 2.3 lists symbols (s 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 quantit36
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.
cavitatiou: the implosion of vapor bubbles formed after flashing when the local pressure rises above the vapor pressure of the liquid. Sec also flashing.
Coriotis flowrnetcr: 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 measurements of density and temperature.
cross-talk: if two or more Coriolis flow meters are to be mounted close together, interference through mechanical coupling may occur. This is often referred to as crosstalk. The manufacturer should be consulted for methods of avoiding cross-talk.
4.1.1 Minimum Flow Rate (q,). The minimum flow rate, (mass or volume) of a Coriolts flowmeter is determined by the maximum permissible measurement error.
NOTE: The mea.urirnent error of a Coriolis flnwrnetvr i determined from the flowmeters zero stability (ZS) and the manufactur er’s published accuracy equation. Once q,, is determined in base units (mass or volume) for a particular gas or liquid mixture, it will remain constant over the range of temperature. pressure. and flow velocity Only a change in gas composition or base conditions will cause the value of q.nin to change
4.1.2 MaxImum Flow Rate The maximum flow rate, (mass or volume) of a Coriolis flowmeter is determined by the maximum acceptable pressure drop (p) across the Ilowmeter.
4.1.3 oriolis Flowmeter Pressure Loss (.ip1). Cot- red sizing of the Coriolis flowmeter will optimize the flowmcter performance over the flow rate range with a pressure drop that is acceptable for the application. If maintaining a low pressure drop is a priority flowmetcr selection will be made to provide the lowest possible pressure drop at maximum flow while maintaining an acceptable measurement performance at minimum flow rates.
(a) Figures 4.1.3-1 and 4.13-2 show examples of the relationship between pressure drop and Coriolis flow- meter performance in gas applications at 70 bar (1,000 psig) and 35 bar (500 psig) for several typical sizes of Coriolis flowmeters,
(b) Figure 4.1.3-3 shows examples of the relationship between pressure drop and Coriolis flowmeter performance in liquid application over a wide turndown for several typical sizes of Curious flowmeters.
(c) Figure 4.1.3-4 shows examples of Coriolis flow- meter performance in a liquid application at q, for several typical sizes of Coriolis flowmeters.
NOTE: Owck with the manufacturer for similar data on Coriolis flowmeters being considered for your applications.
Pressure drop is determined by a constant called the pressure loss coefficient, K,1, and is defined as Rewriting this equation to solve for pressure drop (4p) the equation becomes.