ASME MFC-16M:1995 pdf download Measurement of Fluid Flow in Closed Conduits by Means of Electromagnetic Flowmeters
1 SCOPE
This Standard applies to AC and pulsed-DC type industrial electromagnetic flowmeters with either wetted ornon-wetted electrodes, and to the application of theseflowmeters to the measurement of the volumetric fowrate of electrically conducting and electrically homogeneous liquids or slurries flowing in a completely filledclosed conduit. It specifically does not apply to insertionor medical type electromagnetic fowmeters. It also doesnot cover applications of industrial flowmeters involvingnonconductive liquids or highly conductive liquids (i.e.liquid metals).
This document contains a discussion of the theory andmeasurement technique of an electromagnetic flowmetera physical description of the various types available, application considerations, specifications as to what equipment markings should reside on the meter, and liquidcalibration procedures.
2 REFERENCES
Unless otherwise indicated, the latest issue of the fol-lowing American National Standards shall be used.
ASME B16 ScriesStandards for Valves, Fittings,Flanges,and Gaskets
ASME MFC-IMGlossary of Terms Used in theMeasurement of Fluid Flow in Pipes
ASME MFC-2M,Measurement Uncertainty for FluidFlow in Closed Conduits
ASME MFC-9M，Measurement of Liquid Flow inClosed Conduits by Weighing Method
ASME MFC-10MMethod for Establishing Installa-tion Effects on Flowmeters
AWWA C207,Steel Pipe Flanges for Waterworks Service (Sizes 4 in. through 144 in.)
See Appendix D for other applicable standards.
3 TERMINOLOGY
Definitions stated in ASME MFC-1M and MFC-2Mapply to this Standard. Those definitions particularly per.tinent to this document are listed below, in most casesin an expanded form.
accuracy (also referred to as Measurement Uncertaintysee ASME MFC-2M) – the accuracy of a flowmeterexpressed as a percentage, gives the maximum expectedplus or minus deviation between the meter’s indicationand the estimated true yalue of the flow rate. It is theinterval within which the true value of a measured quantity can be expected to lie with a specified confidencelevel. It is a combination of random and systematic un-certainties. Refer to ASME MFC-2M for the proceduresfor calculating and combining random and systematicuncertainties
bias (also referred to as Systematic Uncertainty, seeASME MFC-2M) — the uncertainty associated withsystematic errors (i.e., those that cannot be reduced byincreasing the number of measurements taken underfixed flow conditions)
linearity — the maximum deviation, expressed as a per.centage. of the calibration curve from a straight linepassing through zero and coinciding with the calibrationcurve at the upper range value. Linearity, if stated, applies only above a specified flow rate.
precision (also referred to as Random Uncertainty, seeASME MFC-2M)- the precision of a flowmeter,expressed as a plus or minus percent deviation about themean measured value, gives the interval within whichrepeated measured flow values taken under fixed flowconditions should lie with a specified confidence levelIt is a measure of the random errors.
primary meter factor (also referred to as Meter Factor) the number, determined by liquid calibration, that en-ables the output flow signal to be related to the volumetric fow rate under defined reference conditions.
rangeability (sce ASME MFC-1M)- fowmeter rangeability is the ratio of the maximum to minimum flowrates in the range over which the meter meets a specified